Advanced Materials and Devices : [243]

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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 243
  • Utility-of-copper-oxide-nanoparticles--CuO-NPs--as-eff_2020_Journal-of-Scien.pdf.jpg
  • Article


  • Authors: Siddiqui, Hafsa; Parra, Mohammad Ramzan; Pandey, Padmini; Qureshi, M.S.; Haque, Fozia Zia (2020)

  • In the present work, we have endeavored the utilization of wet-chemically synthesized copper oxide nanoparticles (CuO-NPs) as the active layer in hybrid bulk heterojunction (BHJ) solar cells. The BHJs with CuO-NPs display significantly different physics from customary BHJs, and prove a noteworthy improvement in their performance. It is noted that with the addition of CuO-NPs, the morphology of the photoactive layer endures significant changes. Incorporating CuO-NPs is an additional paradigm for BHJs solar cells which enhances the photocurrent density from 9.43 mA/cm2 to 11.32 mA/cm2 and the external quantum efficiency as well. Also the power-conversion efficiency (PCE) improved from 2...

  • Tungsten-oxide-modified-with-carbon-nanodots--Inte_2020_Journal-of-Science--.pdf.jpg
  • Article


  • Authors: P, Smrithi S; Kottam, Nagaraju; V, Arpitha; Narula, Archna; N, Anilkumar G; V, Subramanian K R (2020)

  • We report for the first time the green synthesis of carbon nanodots (g-CDs) from the peels of T. cucumerina by simple hydrothermal route. An in-situ liquid phase process was adopted for the design of the monoclinic tungsten trioxide (m-WO3)- based nanostructure with g-CDs to obtain a bi-functionalg-CDs/m-WO3 system. Characterization techniques, such as X- Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Field Emission Scanning Electron Microcsopy (FESEM), Energy Dispersion XRay Analysis (EDX), Fourier Transformed Infra-Red (FTIR), Ultra Violet Defuse Reflectance Spectroscopy (UV-DRS) and Photoluminescence Emission Spectroscopy (PLES) were employed for the morphological, ...

  • Simulation-of-coupling-optical-modes-in-1D-pho_2020_Journal-of-Science--Adva.pdf.jpg
  • Article


  • Authors: Le, Ngoc Duc; Nguyen-Tran, Thuat (2020)

  • In this paper, one-dimensional photonic crystal distributed feedback structures were chosen for simulating the photonic modes. The corresponding photonic bands were calculated by using a numerical method for solving the master equation, while the reflectivity spectra of the structures were simulated by using a rigorous coupled wave analysis method. By observing the variation of the photonic band diagram and the reflectivity spectrum versus different geometrical parameters, the variation of the photonic bands was detailedly studied. We observed two kinds of photonic modes: (i) the one related to the vertical structures, and (ii) the other related to the horizontal periodic structures. ...

  • Preparation-and-characterization-of-a-chitosan-MgO-_2020_Journal-of-Science-.pdf.jpg
  • Article


  • Authors: Nga, Nguyen Kim; Chau, Nguyen Thi Thuy; Viet, Pham Hung (2020)

  • We developed a multi-functional adsorbent with excellent adsorption capacity and low contact time for reactive blue (RB) 19 dye removal. A multi-functional film based on chitosan (CS) combined with nanosized MgO was prepared by solvent casting with mild drying. The CS/MgO composite product was characterized by Fourier transform infrared spectroscopy, X-ray diffractometry, Field emission-scanning microscopy, and thermal gravimetric and differential thermal analyses. The adsorption properties of the CS/MgO film for RB 19 removal, including effects of key factors (i.e., adsorbent dosage, contact time, pH, initial dye concentration), adsorption equilibrium, and adsorption kinetics, ...

  • Porous-scaffolds-for-bone-regen_2020_Journal-of-Science--Advanced-Materials-.pdf.jpg
  • Article


  • Authors: Abbasi, Naghmeh; Hamlet, Stephen; Love, Robert M.; Nguyen, Nam-Trung (2020)

  • Globally, bone fractures due to osteoporosis occur every 20 s in people aged over 50 years. The significant healthcare costs required to manage this problem are further exacerbated by the long healing times experienced with current treatment practices. Novel treatment approaches such as tissue engineering, is using biomaterial scaffolds to stimulate and guide the regeneration of damaged tissue that cannot heal spontaneously. Scaffolds provide a three-dimensional network that mimics the extra cellular microenvironment supporting the viability, attachment, growth and migration of cells whilst maintaining the structure of the regenerated tissue in vivo. The osteogenic capability of...

  • Photocatalytic--nitrite-sensing-and-antibacterial_2020_Journal-of-Science--A.pdf.jpg
  • Article


  • Authors: Kumar, C.R. Rajith; Betageri, Virupaxappa S.; Nagaraju, G.; Pujar, G.H.; Suma, B.P.; Latha, M.S. (2020)

  • In the present work, Nickel oxide nanoparticles (NiO NPs) were synthesized using leaves extract of C. gigantea through a solution combustion method. The NiO NPs were characterized through analytical techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR). The XRD results revealed rhombohedral structured crystallites with average size of 31 nm. SEM and TEM images indicate that the nanoparticles are agglomerated with an asymmetrical shape. The optical energy bandgap of 3.45 eV was estimated using UV-diffused reflectance spectroscopy (UV-DRS). The synthesized NiO NPs have sh...

  • Near-UV-light-excitable-SrAl2O4-Eu3--nanopho_2020_Journal-of-Science--Advanc.pdf.jpg
  • Article


  • Authors: Ashwini, K.R.; Premkumar, H.B.; Darshan, G.P.; Basavaraj, R.B.; Nagabhushana, H.; Prasad, B. Daruka (2020)

  • Near UV-light excitable inorganic phosphors are widely recommended for white-light emitting diode (wLED) applications. Here in this paper we prepared Eu3þ doped SrAl2O4 phosphors with various concentrations of Eu3þ (1e5 mol%) by a green combustion technique. The phase structure and purity of all prepared nanopowders (NPs) were studied by X-ray diffraction analysis. The prepared NPs showed a fibre-like morphology which is confirmed by scanning electron microscopy results. The particle size as obtained by the transmission electron microscopy results is found to be around 40 nm. Further, the elemental composition showed the presence of doped Eu3þ ions into the SrAl2O4 host. The photolumi...

  • Magnetic-interactions-and-spin-wave-stiffness-_2020_Journal-of-Science--Adva.pdf.jpg
  • Article


  • Authors: Huong, Vu Thi Hoai; Nguyet, Dao Thi Thuy; Duong, Nguyen Phuc; Loan, To Thanh; Soontaranon, Siriwat; Anh, Le Duc (2020)

  • Indium-substituted yttrium iron garnet samples, Y3Fe5 xInxO12 (x ¼ 0e0.7, step 0.1), were prepared using a citrate solgel method. Synchrotron X-ray diffraction (SXRD) measurements combined with the Rietveld refinement technique were used to investigate the crystallization, structure parameters and lattice distortion in the samples. Magnetization and Curie temperature of the samples were measured with the SQUID and VSM equipments. The non-magnetic indium ions were found to reside at the octahedral sites, leading to an increase of the total magnetization and a decrease in the Curie temperature. Molecular field coefficients Naa, Ndd and Nad were determined by fitting the experiment...

  • Impedance-and-ionic-transport-properties-of-proton-_2020_Journal-of-Science-.pdf.jpg
  • Article


  • Authors: Ahmed, Hawzhin T.; Abdullah, Omed Gh. (2020)

  • Proton-conducting polymer electrolyte films were prepared by dissolving NH4I salt in polyethylene oxide/methylcellulose (PEO/MC) blend polymers using the solution cast technique. The semi-crystalline nature of the sample was identified from the X-ray diffraction (XRD) pattern. The surface morphology on the electrical conductivity was analyzed by scanning electron microscopy (SEM). The highest ionic conductivity of 7:62 10 5 S=cm was achieved at room temperature for the sample containing 30 wt. % of NH4I. The temperature dependence of the Jonscher's exponent shows that the conduction mechanism can be well represented by the overlapping large polaron tunneling (OLPT) model. The ...

  • A-simple-and-accurate-FDTD-based-technique-to-deter_2020_Journal-of-Science-.pdf.jpg
  • Article


  • Authors: Rahman, Mir Mohsina; Rather, G.M. (2020)

  • This paper proposes a methodology to determine the equivalent electrical properties of multilayered human tissue using the Finite Difference Time Domain (FDTD) method for dispersive media. In addition, the impact of fat layer thickness on the equivalent dielectric properties has also been critically analyzed. The effect of moisture content present in the skin layer has also been studied. The main advantage of the proposed method is that it can be used for any thickness and any number of layers of human tissue. The multilayer reflection and transmission coefficients of the human tissue are first calculated using the FDTD method and then the permittivity and conductivity are extracted u...

  • Realization-of-a-portable-H2S-sensing-inst_2020_Journal-of-Science--Advanced.pdf.jpg
  • Article


  • Authors: Thai, Nguyen Xuan; Duy, Nguyen Van; Hung, Chu Manh; Nguyen, Hugo; Hung, Tran Manh; Hieu, Nguyen Van; Hoa, Nguyen Duc (2020)

  • Monitoring of toxic gas in air is important because air pollution, especially in developing countries, has rapidly become severe. The high cost of installation and maintenance of a stationary analysis system by using methods such as gas chromatography limits its applications. Low-power, portable devices with relatively low-cost gas sensors are effective for mapping pollution levels in real-time in urban areas and in other living environmentts. Herein, the realization of a portable H2S sensing instrument based on SnO2 nanowires is reported. The sensor chip was prepared by the on-chip growth of SnO2 nanowires directly from the edges of Pt electrodes. The electronic system and soft...

  • Graphene-research-and-their-outputs--_2020_Journal-of-Science--Advanced-Mate.pdf.jpg
  • Article


  • Authors: Tiwari, Santosh K.; Sahoo, Sumanta; Wang, Nannan; Huczko, Andrzej (2020)

  • Among various 2D materials, graphene has received extensive research attention in the last 2-3 decades due to its fascinating properties. The discovery of graphene provided an immense boost up and new dimension to materials research and nanotechnology. The multidisciplinary characteristics of graphene havea wide range of applications from health to aerospace. Modern graphene research has been directed towards the exploration of new graphene derivatives and their utilisations for fabrication of products and devices. The enhancement of graphene properties by functionalization or surface modification is another innovative approach. However, like other 2D materials, graphene researc...

  • Epitaxial-growth-of-Ce-doped--Pb-Gd-3-Al-Ga-5O1_2020_Journal-of-Science--Adv.pdf.jpg
  • Article


  • Authors: Vasil'ev, Dmitrii A.; Spassky, Dmitry A.; Kurosawa, Shunsuke; Omelkov, Sergey I.; Vasil'eva, Natalia V.; Plotnichenko, Victor G.; Khakhalin, Andrey V.; Voronov, Valery V.; Kochurikhin, Vladimir V. (2020)

  • Се-doped (Pb,Gd)3(Al,Ga)5O12 single crystalline garnet films were grown using liquid-phase epitaxy from four series of supercooled PbOeB2O3-based melt solutions on Gd3Ga5O12 and Gd3Al2.26Ga2.74O12 single crystal substrates. The optical and scintillation properties of the epitaxial garnet films were studied. The 5d-4f emission of Ce3þ ions within 450e650 nm was observed. The highest pulsed cathodoluminescence yield and scintillation yield values under 133Ba excitation for the Pb0.01Ce0.02Gd2.97Al3.13Ga1.87O12 film were 43,100 photons/MeV and 20,000 photons/MeV, respectively. The pulsed cathodoluminescence decay times of the film were 1.8 (1%), 24 (25%), and 60 ns (74%), and the s...

  • Electrical-conductivity-and-alcohol-sensing-st_2020_Journal-of-Science--Adva.pdf.jpg
  • Article


  • Authors: Husain, Ahmad; Ahmad, Sharique; Mohammad, Faiz (2020)

  • Conducting polymer-based sensors have short response time at room temperature besides their good electrical conductivity. However, the poor electrical conductivity retention at a higher temperature and the failing reproducibility of sensors which are based on conducting polymers are an area of concern. To this end, we are reporting the preparation of polythiophene (PTh) and polythiophene/Tin oxide (PTh/ SnO2) nanocomposites by an in-situ chemical oxidative polymerisation. The as-prepared materials were characterized by FTIR, SEM, UV-vis absorbance spectroscopy, TEM and XRD techniques. PTh/SnO2-3 (i.e. PTh/SnO2 nanocomposite containing 15% SnO2 nanoparticles) showed the highest DC ele...

  • Calcium-phosphate-stability-on-melt-elec_2020_Journal-of-Science--Advanced-M.pdf.jpg
  • Article


  • Authors: Abbasi, Naghmeh; Hamlet, Stephen; Dau, Van Thanh; Nguyen, Nam-Trung (2020)

  • Calcium phosphate (CaP) coating on melt electrowritten (MEW) substrates is a potential candidate for bone regeneration influencing the interaction of osteoblasts with implanted scaffolds. Pretreatment to improve hydrophilicity of the hydrophobic polymer fibres affects subsequent coating with bioactive compounds like CaP. Therefore, this study evaluated the subsequent stability and structural properties of CaP coated MEW Poly-ε-caprolactone (PCL) scaffolds following pre-treatment with either argon-oxygen plasma or sodium hydroxide (NaOH). Scanning electron microscopy and m-CT showed uniform CaP coating after one hour immersion in simulated body fluid following plasma pretreatment. More...

  • The-effects-of-shape-setting-on-transformation-t_2019_Journal-of-Science--Ad.pdf.jpg
  • Article


  • Authors: Asl, Farideh Jahanbazi; Kadkhodaei, Mahmoud; Karimzadeh, Fathallah (2019)

  • Since shape memory alloy (SMA) wires can hardly ever be reliably employed under compressive loadings, SMA springs are developed as axial actuators with the ability of withstanding both tension and compression. In this paper, shape memory alloy helical springs are produced by shape-setting two types of wires: one with shape memory effect (SME) and the other with pseudoelasticity (PE) at the ambient temperature. Phase transformation temperatures of the produced springs are measured by differential scanning calorimetry (DSC), and the influences of effective parameters including cold work, heat treatment temperature and duration, and cooling rate are investigated on transformation te...

  • Study-of-modified-PEDOT-PSS-for-tuning-the-opt_2019_Journal-of-Science--Adva.pdf.jpg
  • Article


  • Authors: Singh, Vinamrita; Kumar, Tanuj (2019)

  • The present work focuses on studying the optical properties of the pristine PEDOT:PSS and the PEDOT:PSS modified with de-ionized water, ethylene glycol and MWCNT. The effect of various additives on the absorption, the refractive index, and the dielectric constant has been inspected. The refractive index dispersion has been analyzed using the single oscillator model developed by Wemple and DiDomenico. The optical constants, such as the dispersion energy, the single oscillator energy, the average oscillator strength, the average interband oscillator strength, the long wavelength refractive index, and the plasma resonance frequency have been determined. The energy bandgap was found ...

  • Statistical-optimization-of-activated-carbon-from-T_2019_Journal-of-Science-.pdf.jpg
  • Article


  • Authors: Machrouhi, A.; Alilou, H.; Farnane, M.; Hamidi, S. El; Sadiq, M.; Abdennouri, M.; Tounsadi, H.; Barka, N. (2019)

  • This study focused on the preparation of activated carbons from Thapsia transtagana stems by boric acid activation and their evaluation for dyes removal. The central composite design and response surface methodology were used to optimize the preparation conditions. The effect of activation temperature, impregnation ratio and activation time on iodine number (IN), methylene blue index (MB index) and removal efficiencies of methyl violet (MV), methyl orange (MO) and indigo carmine (IC) were fully evaluated. The activated carbon samples prepared in optimal conditions were characterized by FTIR, XRD, SEM-EDX, Boehm's titration, and point of zero charge (pHPZC). The equilibrium data ...

  • Solar-cells-micro-crack-detection-technique-us_2019_Journal-of-Science--Adva.pdf.jpg
  • Article


  • Authors: Dhimish, Mahmoud; Holmes, Violeta (2019)

  • In this article, we present the development of a novel technique that is used to enhance the detection of micro cracks in solar cells. Initially, the output image of a conventional electroluminescence (EL) system is determined and reprocessed using the binary and discreet Fourier transform (DFT) image processing models. The binary image is used to enhance the detection of the cracks size, position and orientation, principally using the geometric properties of the EL image. On the other hand, the DFT has been used to analyse the EL image in a two-dimensional spectrum. The output image of the DFT consists of structures of all required frequencies, thus improving the detection of p...

  • Role-of-Co-dopants-on-the-structural--optical-and-_2019_Journal-of-Science--.pdf.jpg
  • Article


  • Authors: Dung, D.D.; Doan, N.B.; Dung, N.Q.; Bac, L.H.; Linh, N.H.; Thanh, L.T.H.; Thiet, D.V.; Trung, N.N.; Khang, N.C.; Trung, T.V.; Duc, N.V. (2019)

  • Co-doped Na0.5Bi0.5TiO3 materials were fabricated by a sol-gel technique. The structural distortion of Codoped Na0.5Bi0.5TiO3 materials was due to the difference between the radii of Co dopants and Ti hosts. The optical band gap decreased from 3.11 to 1.83 eV because of the local state of the Co cation in the band structure. Room temperature ferromagnetism emerged as compensation of diamagnetic background and possibly intrinsic ferromagnetic signals. The magnetic moment was determined to be ~0.64 mB/Co at 5 K. The origin of the room temperature ferromagnetism in the Co-doped Na0.5Bi0.5TiO3 materials was also investigated through the first-principles calculation method. Our study ...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 243

Advanced Materials and Devices : [243]

Follow this collection to receive daily e-mail notification of new additions
Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 243
  • Utility-of-copper-oxide-nanoparticles--CuO-NPs--as-eff_2020_Journal-of-Scien.pdf.jpg
  • Article


  • Authors: Siddiqui, Hafsa; Parra, Mohammad Ramzan; Pandey, Padmini; Qureshi, M.S.; Haque, Fozia Zia (2020)

  • In the present work, we have endeavored the utilization of wet-chemically synthesized copper oxide nanoparticles (CuO-NPs) as the active layer in hybrid bulk heterojunction (BHJ) solar cells. The BHJs with CuO-NPs display significantly different physics from customary BHJs, and prove a noteworthy improvement in their performance. It is noted that with the addition of CuO-NPs, the morphology of the photoactive layer endures significant changes. Incorporating CuO-NPs is an additional paradigm for BHJs solar cells which enhances the photocurrent density from 9.43 mA/cm2 to 11.32 mA/cm2 and the external quantum efficiency as well. Also the power-conversion efficiency (PCE) improved from 2...

  • Tungsten-oxide-modified-with-carbon-nanodots--Inte_2020_Journal-of-Science--.pdf.jpg
  • Article


  • Authors: P, Smrithi S; Kottam, Nagaraju; V, Arpitha; Narula, Archna; N, Anilkumar G; V, Subramanian K R (2020)

  • We report for the first time the green synthesis of carbon nanodots (g-CDs) from the peels of T. cucumerina by simple hydrothermal route. An in-situ liquid phase process was adopted for the design of the monoclinic tungsten trioxide (m-WO3)- based nanostructure with g-CDs to obtain a bi-functionalg-CDs/m-WO3 system. Characterization techniques, such as X- Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Field Emission Scanning Electron Microcsopy (FESEM), Energy Dispersion XRay Analysis (EDX), Fourier Transformed Infra-Red (FTIR), Ultra Violet Defuse Reflectance Spectroscopy (UV-DRS) and Photoluminescence Emission Spectroscopy (PLES) were employed for the morphological, ...

  • Simulation-of-coupling-optical-modes-in-1D-pho_2020_Journal-of-Science--Adva.pdf.jpg
  • Article


  • Authors: Le, Ngoc Duc; Nguyen-Tran, Thuat (2020)

  • In this paper, one-dimensional photonic crystal distributed feedback structures were chosen for simulating the photonic modes. The corresponding photonic bands were calculated by using a numerical method for solving the master equation, while the reflectivity spectra of the structures were simulated by using a rigorous coupled wave analysis method. By observing the variation of the photonic band diagram and the reflectivity spectrum versus different geometrical parameters, the variation of the photonic bands was detailedly studied. We observed two kinds of photonic modes: (i) the one related to the vertical structures, and (ii) the other related to the horizontal periodic structures. ...

  • Preparation-and-characterization-of-a-chitosan-MgO-_2020_Journal-of-Science-.pdf.jpg
  • Article


  • Authors: Nga, Nguyen Kim; Chau, Nguyen Thi Thuy; Viet, Pham Hung (2020)

  • We developed a multi-functional adsorbent with excellent adsorption capacity and low contact time for reactive blue (RB) 19 dye removal. A multi-functional film based on chitosan (CS) combined with nanosized MgO was prepared by solvent casting with mild drying. The CS/MgO composite product was characterized by Fourier transform infrared spectroscopy, X-ray diffractometry, Field emission-scanning microscopy, and thermal gravimetric and differential thermal analyses. The adsorption properties of the CS/MgO film for RB 19 removal, including effects of key factors (i.e., adsorbent dosage, contact time, pH, initial dye concentration), adsorption equilibrium, and adsorption kinetics, ...

  • Porous-scaffolds-for-bone-regen_2020_Journal-of-Science--Advanced-Materials-.pdf.jpg
  • Article


  • Authors: Abbasi, Naghmeh; Hamlet, Stephen; Love, Robert M.; Nguyen, Nam-Trung (2020)

  • Globally, bone fractures due to osteoporosis occur every 20 s in people aged over 50 years. The significant healthcare costs required to manage this problem are further exacerbated by the long healing times experienced with current treatment practices. Novel treatment approaches such as tissue engineering, is using biomaterial scaffolds to stimulate and guide the regeneration of damaged tissue that cannot heal spontaneously. Scaffolds provide a three-dimensional network that mimics the extra cellular microenvironment supporting the viability, attachment, growth and migration of cells whilst maintaining the structure of the regenerated tissue in vivo. The osteogenic capability of...

  • Photocatalytic--nitrite-sensing-and-antibacterial_2020_Journal-of-Science--A.pdf.jpg
  • Article


  • Authors: Kumar, C.R. Rajith; Betageri, Virupaxappa S.; Nagaraju, G.; Pujar, G.H.; Suma, B.P.; Latha, M.S. (2020)

  • In the present work, Nickel oxide nanoparticles (NiO NPs) were synthesized using leaves extract of C. gigantea through a solution combustion method. The NiO NPs were characterized through analytical techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR). The XRD results revealed rhombohedral structured crystallites with average size of 31 nm. SEM and TEM images indicate that the nanoparticles are agglomerated with an asymmetrical shape. The optical energy bandgap of 3.45 eV was estimated using UV-diffused reflectance spectroscopy (UV-DRS). The synthesized NiO NPs have sh...

  • Near-UV-light-excitable-SrAl2O4-Eu3--nanopho_2020_Journal-of-Science--Advanc.pdf.jpg
  • Article


  • Authors: Ashwini, K.R.; Premkumar, H.B.; Darshan, G.P.; Basavaraj, R.B.; Nagabhushana, H.; Prasad, B. Daruka (2020)

  • Near UV-light excitable inorganic phosphors are widely recommended for white-light emitting diode (wLED) applications. Here in this paper we prepared Eu3þ doped SrAl2O4 phosphors with various concentrations of Eu3þ (1e5 mol%) by a green combustion technique. The phase structure and purity of all prepared nanopowders (NPs) were studied by X-ray diffraction analysis. The prepared NPs showed a fibre-like morphology which is confirmed by scanning electron microscopy results. The particle size as obtained by the transmission electron microscopy results is found to be around 40 nm. Further, the elemental composition showed the presence of doped Eu3þ ions into the SrAl2O4 host. The photolumi...

  • Magnetic-interactions-and-spin-wave-stiffness-_2020_Journal-of-Science--Adva.pdf.jpg
  • Article


  • Authors: Huong, Vu Thi Hoai; Nguyet, Dao Thi Thuy; Duong, Nguyen Phuc; Loan, To Thanh; Soontaranon, Siriwat; Anh, Le Duc (2020)

  • Indium-substituted yttrium iron garnet samples, Y3Fe5 xInxO12 (x ¼ 0e0.7, step 0.1), were prepared using a citrate solgel method. Synchrotron X-ray diffraction (SXRD) measurements combined with the Rietveld refinement technique were used to investigate the crystallization, structure parameters and lattice distortion in the samples. Magnetization and Curie temperature of the samples were measured with the SQUID and VSM equipments. The non-magnetic indium ions were found to reside at the octahedral sites, leading to an increase of the total magnetization and a decrease in the Curie temperature. Molecular field coefficients Naa, Ndd and Nad were determined by fitting the experiment...

  • Impedance-and-ionic-transport-properties-of-proton-_2020_Journal-of-Science-.pdf.jpg
  • Article


  • Authors: Ahmed, Hawzhin T.; Abdullah, Omed Gh. (2020)

  • Proton-conducting polymer electrolyte films were prepared by dissolving NH4I salt in polyethylene oxide/methylcellulose (PEO/MC) blend polymers using the solution cast technique. The semi-crystalline nature of the sample was identified from the X-ray diffraction (XRD) pattern. The surface morphology on the electrical conductivity was analyzed by scanning electron microscopy (SEM). The highest ionic conductivity of 7:62 10 5 S=cm was achieved at room temperature for the sample containing 30 wt. % of NH4I. The temperature dependence of the Jonscher's exponent shows that the conduction mechanism can be well represented by the overlapping large polaron tunneling (OLPT) model. The ...

  • A-simple-and-accurate-FDTD-based-technique-to-deter_2020_Journal-of-Science-.pdf.jpg
  • Article


  • Authors: Rahman, Mir Mohsina; Rather, G.M. (2020)

  • This paper proposes a methodology to determine the equivalent electrical properties of multilayered human tissue using the Finite Difference Time Domain (FDTD) method for dispersive media. In addition, the impact of fat layer thickness on the equivalent dielectric properties has also been critically analyzed. The effect of moisture content present in the skin layer has also been studied. The main advantage of the proposed method is that it can be used for any thickness and any number of layers of human tissue. The multilayer reflection and transmission coefficients of the human tissue are first calculated using the FDTD method and then the permittivity and conductivity are extracted u...

  • Realization-of-a-portable-H2S-sensing-inst_2020_Journal-of-Science--Advanced.pdf.jpg
  • Article


  • Authors: Thai, Nguyen Xuan; Duy, Nguyen Van; Hung, Chu Manh; Nguyen, Hugo; Hung, Tran Manh; Hieu, Nguyen Van; Hoa, Nguyen Duc (2020)

  • Monitoring of toxic gas in air is important because air pollution, especially in developing countries, has rapidly become severe. The high cost of installation and maintenance of a stationary analysis system by using methods such as gas chromatography limits its applications. Low-power, portable devices with relatively low-cost gas sensors are effective for mapping pollution levels in real-time in urban areas and in other living environmentts. Herein, the realization of a portable H2S sensing instrument based on SnO2 nanowires is reported. The sensor chip was prepared by the on-chip growth of SnO2 nanowires directly from the edges of Pt electrodes. The electronic system and soft...

  • Graphene-research-and-their-outputs--_2020_Journal-of-Science--Advanced-Mate.pdf.jpg
  • Article


  • Authors: Tiwari, Santosh K.; Sahoo, Sumanta; Wang, Nannan; Huczko, Andrzej (2020)

  • Among various 2D materials, graphene has received extensive research attention in the last 2-3 decades due to its fascinating properties. The discovery of graphene provided an immense boost up and new dimension to materials research and nanotechnology. The multidisciplinary characteristics of graphene havea wide range of applications from health to aerospace. Modern graphene research has been directed towards the exploration of new graphene derivatives and their utilisations for fabrication of products and devices. The enhancement of graphene properties by functionalization or surface modification is another innovative approach. However, like other 2D materials, graphene researc...

  • Epitaxial-growth-of-Ce-doped--Pb-Gd-3-Al-Ga-5O1_2020_Journal-of-Science--Adv.pdf.jpg
  • Article


  • Authors: Vasil'ev, Dmitrii A.; Spassky, Dmitry A.; Kurosawa, Shunsuke; Omelkov, Sergey I.; Vasil'eva, Natalia V.; Plotnichenko, Victor G.; Khakhalin, Andrey V.; Voronov, Valery V.; Kochurikhin, Vladimir V. (2020)

  • Се-doped (Pb,Gd)3(Al,Ga)5O12 single crystalline garnet films were grown using liquid-phase epitaxy from four series of supercooled PbOeB2O3-based melt solutions on Gd3Ga5O12 and Gd3Al2.26Ga2.74O12 single crystal substrates. The optical and scintillation properties of the epitaxial garnet films were studied. The 5d-4f emission of Ce3þ ions within 450e650 nm was observed. The highest pulsed cathodoluminescence yield and scintillation yield values under 133Ba excitation for the Pb0.01Ce0.02Gd2.97Al3.13Ga1.87O12 film were 43,100 photons/MeV and 20,000 photons/MeV, respectively. The pulsed cathodoluminescence decay times of the film were 1.8 (1%), 24 (25%), and 60 ns (74%), and the s...

  • Electrical-conductivity-and-alcohol-sensing-st_2020_Journal-of-Science--Adva.pdf.jpg
  • Article


  • Authors: Husain, Ahmad; Ahmad, Sharique; Mohammad, Faiz (2020)

  • Conducting polymer-based sensors have short response time at room temperature besides their good electrical conductivity. However, the poor electrical conductivity retention at a higher temperature and the failing reproducibility of sensors which are based on conducting polymers are an area of concern. To this end, we are reporting the preparation of polythiophene (PTh) and polythiophene/Tin oxide (PTh/ SnO2) nanocomposites by an in-situ chemical oxidative polymerisation. The as-prepared materials were characterized by FTIR, SEM, UV-vis absorbance spectroscopy, TEM and XRD techniques. PTh/SnO2-3 (i.e. PTh/SnO2 nanocomposite containing 15% SnO2 nanoparticles) showed the highest DC ele...

  • Calcium-phosphate-stability-on-melt-elec_2020_Journal-of-Science--Advanced-M.pdf.jpg
  • Article


  • Authors: Abbasi, Naghmeh; Hamlet, Stephen; Dau, Van Thanh; Nguyen, Nam-Trung (2020)

  • Calcium phosphate (CaP) coating on melt electrowritten (MEW) substrates is a potential candidate for bone regeneration influencing the interaction of osteoblasts with implanted scaffolds. Pretreatment to improve hydrophilicity of the hydrophobic polymer fibres affects subsequent coating with bioactive compounds like CaP. Therefore, this study evaluated the subsequent stability and structural properties of CaP coated MEW Poly-ε-caprolactone (PCL) scaffolds following pre-treatment with either argon-oxygen plasma or sodium hydroxide (NaOH). Scanning electron microscopy and m-CT showed uniform CaP coating after one hour immersion in simulated body fluid following plasma pretreatment. More...

  • The-effects-of-shape-setting-on-transformation-t_2019_Journal-of-Science--Ad.pdf.jpg
  • Article


  • Authors: Asl, Farideh Jahanbazi; Kadkhodaei, Mahmoud; Karimzadeh, Fathallah (2019)

  • Since shape memory alloy (SMA) wires can hardly ever be reliably employed under compressive loadings, SMA springs are developed as axial actuators with the ability of withstanding both tension and compression. In this paper, shape memory alloy helical springs are produced by shape-setting two types of wires: one with shape memory effect (SME) and the other with pseudoelasticity (PE) at the ambient temperature. Phase transformation temperatures of the produced springs are measured by differential scanning calorimetry (DSC), and the influences of effective parameters including cold work, heat treatment temperature and duration, and cooling rate are investigated on transformation te...

  • Study-of-modified-PEDOT-PSS-for-tuning-the-opt_2019_Journal-of-Science--Adva.pdf.jpg
  • Article


  • Authors: Singh, Vinamrita; Kumar, Tanuj (2019)

  • The present work focuses on studying the optical properties of the pristine PEDOT:PSS and the PEDOT:PSS modified with de-ionized water, ethylene glycol and MWCNT. The effect of various additives on the absorption, the refractive index, and the dielectric constant has been inspected. The refractive index dispersion has been analyzed using the single oscillator model developed by Wemple and DiDomenico. The optical constants, such as the dispersion energy, the single oscillator energy, the average oscillator strength, the average interband oscillator strength, the long wavelength refractive index, and the plasma resonance frequency have been determined. The energy bandgap was found ...

  • Statistical-optimization-of-activated-carbon-from-T_2019_Journal-of-Science-.pdf.jpg
  • Article


  • Authors: Machrouhi, A.; Alilou, H.; Farnane, M.; Hamidi, S. El; Sadiq, M.; Abdennouri, M.; Tounsadi, H.; Barka, N. (2019)

  • This study focused on the preparation of activated carbons from Thapsia transtagana stems by boric acid activation and their evaluation for dyes removal. The central composite design and response surface methodology were used to optimize the preparation conditions. The effect of activation temperature, impregnation ratio and activation time on iodine number (IN), methylene blue index (MB index) and removal efficiencies of methyl violet (MV), methyl orange (MO) and indigo carmine (IC) were fully evaluated. The activated carbon samples prepared in optimal conditions were characterized by FTIR, XRD, SEM-EDX, Boehm's titration, and point of zero charge (pHPZC). The equilibrium data ...

  • Solar-cells-micro-crack-detection-technique-us_2019_Journal-of-Science--Adva.pdf.jpg
  • Article


  • Authors: Dhimish, Mahmoud; Holmes, Violeta (2019)

  • In this article, we present the development of a novel technique that is used to enhance the detection of micro cracks in solar cells. Initially, the output image of a conventional electroluminescence (EL) system is determined and reprocessed using the binary and discreet Fourier transform (DFT) image processing models. The binary image is used to enhance the detection of the cracks size, position and orientation, principally using the geometric properties of the EL image. On the other hand, the DFT has been used to analyse the EL image in a two-dimensional spectrum. The output image of the DFT consists of structures of all required frequencies, thus improving the detection of p...

  • Role-of-Co-dopants-on-the-structural--optical-and-_2019_Journal-of-Science--.pdf.jpg
  • Article


  • Authors: Dung, D.D.; Doan, N.B.; Dung, N.Q.; Bac, L.H.; Linh, N.H.; Thanh, L.T.H.; Thiet, D.V.; Trung, N.N.; Khang, N.C.; Trung, T.V.; Duc, N.V. (2019)

  • Co-doped Na0.5Bi0.5TiO3 materials were fabricated by a sol-gel technique. The structural distortion of Codoped Na0.5Bi0.5TiO3 materials was due to the difference between the radii of Co dopants and Ti hosts. The optical band gap decreased from 3.11 to 1.83 eV because of the local state of the Co cation in the band structure. Room temperature ferromagnetism emerged as compensation of diamagnetic background and possibly intrinsic ferromagnetic signals. The magnetic moment was determined to be ~0.64 mB/Co at 5 K. The origin of the room temperature ferromagnetism in the Co-doped Na0.5Bi0.5TiO3 materials was also investigated through the first-principles calculation method. Our study ...

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