Advanced Materials and Devices : [226]

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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 226
  • Preparation and characterization of SnO2 doped TiO2 nanoparticles_ Effect of phase changes on the photocatalytic and catalytic activity.pdf.jpg
  • Article


  • Authors: Hassan, Shawky M.; Ahmed, Awad I.; Mannaa, Mohammed A. (2019)

  • The effects of phase changes on the photocatalytic and catalytic activities of SnO2/TiO2 nanoparticles prepared via surfactant-assisted sol-gel method were investigated. The as-prepared SnO2/TiO2 was calcined at 400 , 500 , 600 , and 700 C. The prepared samples were studied by XRD, TEM, SEM, FTIR, BET, UV-vis diffuse reflection spectroscopy (DRS) and Photoluminescence (PL) spectra. The results showed that the crystallite size and anatase-to-rutile phase transformation increase greatly with increasing the calcination temperature. The transformation of anatase to rutile phase was found to be between 400 and 600 C, and then the anatase completely transformed to rutile phase at 700 C....

  • Photoluminescence and photocatalytic properties of novel Bi2O3_Sm3+ nanophosphor.pdf.jpg
  • Article


  • Authors: Ashwini, S.; Prashantha, S.C.; Naik, Ramachandra; Naik, Yashwanth V.; Nagabhushana, H.; Narasimhamurthy, K.N. (2019)

  • The current work involves studies of the synthesis, characterization and photoluminescence for Sm3+ (1-11 mol %) doped Bi2O3 nanophosphors (NPs) by a solution combustion method. The average particle size was determined using powder X-ray diffraction (PXRD) and found to be in the range of 13- 30 nm. The Kubelka-Munk (K-M) function was used to assess the energy gap of Sm3+ doped Bi2O3 nanophosphors which was found to be 2.92- 2.96 eV. From the Emission spectra, the Judd–Ofelt parameters (Ω2 and Ω4), the transition probabilities (AT), the quantum efficiency (η), the luminescence lifetime (τr), the colour chromaticity coordinates (CIE) and the correlated colour temperature (CCT) values we...

  • Optical and electrical conductivity studies of VO2+ doped polyvinyl pyrrolidone (PVP) polymer electrolytes.pdf.jpg
  • Article


  • Authors: Sreekanth, K.; Siddaiah, T.; Gopal, N.O.; Kumar, Y. Madhava; Ramu, Ch. (2019)

  • Polymer electrolyte films of polyvinyl pyrrolidone (PVP) complexed with different concentrations (1, 2, 3, 4 and 5 mol%) of VO2þ ions were prepared by a solution casting technique. The formation of complexes between the VO2þ ions and the polymer was confirmed by the Fourier transform infrared spectroscopy (FTIR) and the UV-Vis spectroscopy. Room temperature impedance measurements in the frequency range 42 Hz to 5 MHz revealed that the ionic conductivity increased with the increasing the VO2þ ion concentration. The maximum ionic conductivity of 5.39 10 8 Scm 1 at 303 K was observed for the 5 mol% VO2þ ions doped PVP polymer electrolyte film. From the UV-Visible absorption spectra in ...

  • Novel triazine-based colorimetric and fluorescent sensor for highly selective detection of Al3+.pdf.jpg
  • Article


  • Authors: Celestina, J. Jone; Alphonse, L.; Tharmaraj, P.; Sheela, C.D. (2019)

  • This paper deals with a new fluorescent assay of Al3þ ions with (2,20-(6-((4-nitrophenyl)amino)-1,3,5- triazine-2,4-diyl) bis(hydrazine-2-yl-1-ylidene)) bis(indolin-3-one) (NADO) containing triazine moiety developed over other commonly coexisting metal ions. The complexation activity of NADO with various metal ions in an ethanolic solution is specifically studied by means of fluorescent spectra. The NADO exhibits a significant fluorescence enhancement at 469 nm in presence of Al3þ due to the formation of a complex. Under an optimized condition the detection limit is found to be 0.09 mM. As the concentration of Al3þ is increased, the fluorescence intensity gradually increases due to th...

  • Novel Gomutra (cow urine) mediated synthesis of silver oxide nanoparticles and their enhanced photocatalytic, photoluminescence and antibacterial studies.pdf.jpg
  • Article


  • Authors: Vinay, S.P; Udayabhanu; Nagaraju, G.; Chandrappa, C.P.; Chandrasekhar, N. (2019)

  • This work successfully synthesizes silver oxide (Ag2O) nanoparticles (Nps) using cow urine. The presence of different biological components in cow's urine may acts as fuel for the synthesis of Ag2O Nps by a combustion method at 500 C. This is a rapid and environmentally benign procedure, which has the added advantage of shorter response times and better control over size and shape. The synthesized nanoparticles were characterized by XRD, FTIR, UV-vis, SEM, EDAX and TEM studies and have been tested for photoluminescence and for photocatalytic and biological activities. They show good photocatalytic degradation of methylene blue, due to their sensitivity to absorb light with a wide ban...

  • Novel approaches in cancer management with circulating tumor cell clusters.pdf.jpg
  • Article


  • Authors: Rostami, Peyman; Kashaninejad, Navid; Moshksayan, Khashayar; Saidi, Mohammad Said; Firoozabadi, Baha; Nguyen, Nam-Trung (2019)

  • Tumor metastasis is responsible for the vast majority of cancer-associated morbidities and mortalities. Recent studies have disclosed the higher metastatic potential of circulating tumor cell (CTC) clusters than single CTCs. Despite long-term study on metastasis, the characterizations of its most potent cellular drivers, i.e., CTC clusters have only recently been investigated. The analysis of CTC clusters offers new intuitions into the mechanism of tumor metastasis and can lead to the development of cancer diagnosis and prognosis, drug screening, detection of gene mutations, and anti-metastatic therapeutics. In recent years, considerable attention has been dedicated to the development...

  • Novel Ag-ZnO-La2O2CO3 photocatalysts derived from the Layered Double Hydroxide structure with excellent photocatalytic performance for the degradation of pharmaceutical compounds.pdf.jpg
  • Article


  • Authors: Elhalil, A.; Elmoubarki, R.; Farnane, M.; Machrouhi, A.; Mahjoubi, F.Z.; Sadiq, M.; Qourzal, S.; Abdennouri, M.; Barka, N. (2019)

  • In this work, we have prepared the Ag-ZnO-La2O2CO3 nanomaterials as promising photocatalysts for the photocatalytic degradation of pharmaceutical pollutants. Firstly, a series of ZnAl1-xLax(CO3) (0 x 0.5) layered double hydroxides (LDHs) were synthesized by the co-precipitation method at the component molar ratio of Zn/(Al þ La ¼ 3, where La/Al ¼ 0, 0.25 and 0.5). Photocatalysts were prepared by the calcination of the LDH precursors at different temperatures of 300, 400, 500, 600, 800 and 1000 C. The effects of the La/Al molar ratio and the calcination temperature on the photocatalytic activity of the catalysts were evaluated by the degradation of caffeine as a model pharmaceuti...

  • Nanocellulose based functional materials for supercapacitor applications.pdf.jpg
  • Article


  • Authors: Jose, Jasmine; Thomas, Vinoy; Vinod, Vrinda; Abraham, Rani; Abraham, Susan (2019)

  • Environmental protection and renewable sources for energy conversion and storage remain an important topic nowadays. Major challenges of the 21st century that mankind has to face are certainly energy supply, its storage and conversion in a way that essentially protect the environment. In this scenario the nanocellulose has come up as a sustainable and promising nanomaterial with its unique structure and remarkable properties, such as high specific modulus, excellent stability in most solvents, low toxicity and natural abundance. Its ecofriendly nature, low cost, easy availability and simple synthesis techniques render the nanocellulose as a promising candidate for the fabrication of g...

  • Meander anisotropic magnetoresistance bridge geomagnetic sensors.pdf.jpg
  • Article


  • Authors: Quynh, L.K.; Tu, B.D.; Thuy, N.T.; Viet, D.Q.; Duc, N.H.; Phung, A.T; Huong Giang, D.T. (2019)

  • Anisotropic magnetoresistive (AMR) sensors have long been used for specific industrial applications. Their field detection sensitivity can be improved using magnetic flux concentrators to amplify the magnetic field strength sensed at the sensor. We report on the design and fabrication of a micrometersize meander AMR bridge sensor with an effective AMR branch length of 150. This sensor geometry has enabled us to achieve a magnetic sensitivity as high as 1.25 mV/Oe (or 0.45 mV/V/Oe), which is an enhancement by a factor of about 300 compared to conventional AMR thin film-based sensors. Our study paves a new pathway for the design and application of geomagnetic devices

  • Iron oxide (Fe2O3) nanoparticles modified carbon paste electrode as an advanced material for electrochemical investigation of paracetamol and dopamine.pdf.jpg
  • Article


  • Authors: Vinay, M M; Nayaka, Y. Arthoba (2019)

  • Electrochemical behaviors of paracetamol (PA) and dopamine (DA) have been investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and square wave voltammetry (SWV) using a selective and sensitive iron oxide (Fe2O3) nanoparticle modified carbon paste electrode (IOCPE). The PA and DA showed anodic peak potential at 0.458 V and 0.247 V and cathodic peak potential at 0.088 V and 0.11 V (vs Ag/AgCl), respectively. In DPV mode PA and DA gave linear response over the concentration range of 2 to 150 μM (R2 = 0.998) and 2 to 170 μM (R2 = 0.989), respectively. The limit of detection (LOD = 3s/m) for PA and DA were found to be 1.16 and 0.79 μM, respectively. IOCPE possess ...

  • Hydrogen sulfide sensors based on PANI_f-SWCNT polymer nanocomposite thin films prepared by electrochemical polymerization.pdf.jpg
  • Article


  • Authors: Suhail, Mahdi Hasan; Abdullah, Omed Gh.; Kadhim, Ghada Ayad (2019)

  • Hydrogen sulfide (H2S) gas sensors in the form of thin films based on polyaniline (PAN) incorporated with various concentrations of functionalized single wall carbon nanotubes (f-SWCNT) were prepared by electrochemical polymerization of Aniline monomer with sulfuric acid in an aqueous solution. Surface morphology of the thin film nanocomposites was investigated by Field Emission Scanning Electron Microscopy (FE-SEM) and revealed that the f-SWCNTs were almost uniformly distributed on the surface of the host PANI matrix. The X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy, and Hall effect measurements were used to characterize the synthesized PANI/f-SWCNT nanocom...

  • Heteroatom Doped High Porosity Carbon Nanomaterials as Electrodes for Energy Storage in Electrochemical Capacitors_ A Review.pdf.jpg
  • Article


  • Authors: Abbas, Qaisar; Raza, Rizwan; Shabbir, Imarn; Olabi, A.G. (2019)

  • At present it is indispensable to develop and implement new/state-of-the-art carbon anomaterials as electrode in electrochemical capacitors, since conventional activated carbon based supercapacitor cells cannot fulfil the growing demand of high energy and power densities of electronic devices of present era, as a result of rapid development in this field. Functionalized carbon nanomaterials symbolize the type of materials with huge potential for their use in energy related applications in general and as an electrode active material for electrochemical capacitors in particular. Nitrogen doping of carbons has shown promising results in the field of energy storage in electrochemical capa...

  • Green synthesis of AgZnO nanoparticles_ Structural analysis, hydrogen generation, formylation and biodiesel applications.pdf.jpg
  • Article


  • Authors: Yadav, L.S. Reddy; Pratibha, S.; Manjunath, K.; Shivanna, M.; Ramakrishnappa, T.; Dhananjaya, N.; Nagaraju, G. (2019)

  • The present work reveals the green combustion preparation of the Ag-doped ZnO nanoparticles (NPs) using turmeric root extract as a fuel. The structure and morphology of Ag-doped ZnO NPs were investigated by several analytical techniques such as XRD (X-Ray Diffraction), SEM (Scanning Electron Microscopy), TEM (Transmission Electron Microscopy), FTIR (Fourier Transform Infrared), Raman, XPS (XRay Photoelectron Spectroscopy), and UV-Visible Spectroscopy (UVeVis). From XRD, the crystallite size was found to be about 45 nm which agrees with the TEM results. SEM micrographs reveal the spherical shaped agglomerated particles. XPS measurement anticipates that Ag is mainly in the metallic stat...

  • Glycine-assisted hydrothermal synthesis of NiCo2S4 as an active electrode material for supercapacitors.pdf.jpg
  • Article


  • Authors: Kumar, M. Sathish; Bhagavath, N.; Batabyal, Sudip K.; Kothurkar, Nikhil K. (2019)

  • Nickel cobalt sulfide (NCS) was synthesized from nickel and cobalt nitrate (NCS-1) by a hydrothermal method. In another method, nickel cobalt sulfide (NCS-2) was also synthesized from hydrothermally synthesized nickel cobalt oxide (NCO). The syntheses of NCS-1 and NCO were conducted in the presence of glycine as a templating agent. The NCS and NCO samples were thoroughly characterized by different techniques. XRD studies showed that both NCO and NCS consisted of the cubic crystal phases. Cyclic voltammetry of NCO and NCS revealed that, with an increasing scan rate within the range of 10e100 mV s 1, the specific capacitance of the samples reduced. The specific capacitance of NCS-2, me...

  • Fracture analysis and mechanical properties of three phased glass_epoxy laminates reinforced with multiwalled carbon nanotubes.pdf.jpg
  • Article


  • Authors: Behera, Rohit Pratyush; Rawat, Prashant; Singh, K.K.; Ha, Sung Kyu; Gaurav, Anand; Tiwari, Santosh K. (2019)

  • Herein, we report the use of Multi Wall Carbon Nano Tubes (MWCNTs) as nano-compatibilizers based on their astonishing mechanical properties and ease of processing. To fabricate laminate samples, pure MWCNTs were homogeneously dispersed in the fiber-reinforced plastic (FRP) composite with 0, 0.5, 1 and 1.5 wt. % loading. The laminates were prepared with eight plies (4.0 ± 0.1 mm thickness) using the hand layup technique assisted by the compression moulding method. It was found that the tensile, compressive and inter-laminar shear strength (ILSS) increase by 103.81%, 139.78% and 36.06%, respectively corresponding to 1 wt. % loading of MWCNTs as compared to neat GFRP specimen. However, a...

  • First-principles calculations to investigate structural, electronic, half-metallic and thermodynamic properties of hexagonal UX2O6 (X=Cr,V) compounds.pdf.jpg
  • Article


  • Authors: Berri, Saadi (2019)

  • Full potential linearized augmented plane wave plus local orbital's (FP-LAPW þ LO) method within density functional theory (DFT) is used to investigate the structural, electronic and half-metallic properties of hexagonal UX2O6 (X ¼ Cr,V). Features such as the lattice constant (a and c), bulk modulus and its pressure derivative are reported. The calculated lattice parameters are in good agreement with available experimental results. Band structure and overall densities of states have proved UV2O6 as an indirect half-metallic material with a band gap of 2.88 eV and UCr2O6 as a magnetic semiconductor. The results obtained, make the hexagonal UX2O6 a candidate material for future spintron...

  • Facile solvothermal synthesis and functionalization of polyethylene glycol-coated paramagnetic Gd2(CO3)3 particles and corresponding Gd2O3 nanoparticles for use as MRI contrast agents.pdf.jpg
  • Article


  • Authors: Dougherty, Atika; Nasution, Erika L.Y.; Iskandar, Ferry; Dougherty, Geoff (2019)

  • Paramagnetic particles and nanoparticles have been widely used in bioimaging and biomedical applications. In this paper, functionalized gadolinium carbonate (Gd2(CO3)3) particles with polyethylene glycol (PEG) for use as an MRI contrast agent were produced. These PEGylated particles were also used as a single precursor for synthesizing Gd2O3 nanoparticles by a novel calcination pathway. The morphological, chemical, and structural properties of both the PEGylated Gd2(CO3)3 particles and Gd2O3 nanoparticles were examined using a scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), and energy dispersive X-ray spectroscopy (EDS) techniques. After...

  • Facile fabrication, characterization and efficient photocatalytic activity of surfactant free ZnS, CdS and CuS nanoparticles.pdf.jpg
  • Article


  • Authors: Ayodhya, Dasari; Veerabhadram, Guttena (2019)

  • In this research, some metal sulfide nanoparticles (NPs) including ZnS, CdS and CuS NPs were prepared by a simple and low-cost co-precipitation method for the photocatalytic degradation of Bromothymol blue dye (BTB) under natural sunlight irradiation. The synthesized materials were characterized by XRD, FT-IR, UV-vis DRS, PL, TGA, SEM and TEM techniques for the investigation of structural, electronic, thermal, and morphological properties. The optical absorption and the band gaps of the ZnS, CdS, and CuS NPs were calculated as 3.62 eV, 2.21 eV, and 1.16 eV from the UV-vis DRS. XRD results demonstrate the cubic structure of ZnS NPs, CdS NPs, and the hexagonal structure of CuS NPs in th...

  • Excitonic states and structural stability in two-dimensional hybrid organic-inorganic perovskites.pdf.jpg
  • Article


  • Authors: Lekina, Yulia; Shen, Ze Xiang (2019)

  • Two-dimensional (2D) perovskites are a new class of functional materials that may find applications in various technologically important areas. Due to the better moisture and illumination stability, layered perovskites can be the next generation of materials for solar light-harvesting applications, as well as for light emitting diodes (LEDs). Besides, extended chemical engineering possibilities allow obtaining advanced perovskite materials with desirable functional properties, such as tunable band gap, strong exciton-phonon coupling, white light emission, spin-related effects, etc. A full understanding of the fundamental properties is essential for developing new 2D perovskite-based ...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 226

Advanced Materials and Devices : [226]

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 226
  • Preparation and characterization of SnO2 doped TiO2 nanoparticles_ Effect of phase changes on the photocatalytic and catalytic activity.pdf.jpg
  • Article


  • Authors: Hassan, Shawky M.; Ahmed, Awad I.; Mannaa, Mohammed A. (2019)

  • The effects of phase changes on the photocatalytic and catalytic activities of SnO2/TiO2 nanoparticles prepared via surfactant-assisted sol-gel method were investigated. The as-prepared SnO2/TiO2 was calcined at 400 , 500 , 600 , and 700 C. The prepared samples were studied by XRD, TEM, SEM, FTIR, BET, UV-vis diffuse reflection spectroscopy (DRS) and Photoluminescence (PL) spectra. The results showed that the crystallite size and anatase-to-rutile phase transformation increase greatly with increasing the calcination temperature. The transformation of anatase to rutile phase was found to be between 400 and 600 C, and then the anatase completely transformed to rutile phase at 700 C....

  • Photoluminescence and photocatalytic properties of novel Bi2O3_Sm3+ nanophosphor.pdf.jpg
  • Article


  • Authors: Ashwini, S.; Prashantha, S.C.; Naik, Ramachandra; Naik, Yashwanth V.; Nagabhushana, H.; Narasimhamurthy, K.N. (2019)

  • The current work involves studies of the synthesis, characterization and photoluminescence for Sm3+ (1-11 mol %) doped Bi2O3 nanophosphors (NPs) by a solution combustion method. The average particle size was determined using powder X-ray diffraction (PXRD) and found to be in the range of 13- 30 nm. The Kubelka-Munk (K-M) function was used to assess the energy gap of Sm3+ doped Bi2O3 nanophosphors which was found to be 2.92- 2.96 eV. From the Emission spectra, the Judd–Ofelt parameters (Ω2 and Ω4), the transition probabilities (AT), the quantum efficiency (η), the luminescence lifetime (τr), the colour chromaticity coordinates (CIE) and the correlated colour temperature (CCT) values we...

  • Optical and electrical conductivity studies of VO2+ doped polyvinyl pyrrolidone (PVP) polymer electrolytes.pdf.jpg
  • Article


  • Authors: Sreekanth, K.; Siddaiah, T.; Gopal, N.O.; Kumar, Y. Madhava; Ramu, Ch. (2019)

  • Polymer electrolyte films of polyvinyl pyrrolidone (PVP) complexed with different concentrations (1, 2, 3, 4 and 5 mol%) of VO2þ ions were prepared by a solution casting technique. The formation of complexes between the VO2þ ions and the polymer was confirmed by the Fourier transform infrared spectroscopy (FTIR) and the UV-Vis spectroscopy. Room temperature impedance measurements in the frequency range 42 Hz to 5 MHz revealed that the ionic conductivity increased with the increasing the VO2þ ion concentration. The maximum ionic conductivity of 5.39 10 8 Scm 1 at 303 K was observed for the 5 mol% VO2þ ions doped PVP polymer electrolyte film. From the UV-Visible absorption spectra in ...

  • Novel triazine-based colorimetric and fluorescent sensor for highly selective detection of Al3+.pdf.jpg
  • Article


  • Authors: Celestina, J. Jone; Alphonse, L.; Tharmaraj, P.; Sheela, C.D. (2019)

  • This paper deals with a new fluorescent assay of Al3þ ions with (2,20-(6-((4-nitrophenyl)amino)-1,3,5- triazine-2,4-diyl) bis(hydrazine-2-yl-1-ylidene)) bis(indolin-3-one) (NADO) containing triazine moiety developed over other commonly coexisting metal ions. The complexation activity of NADO with various metal ions in an ethanolic solution is specifically studied by means of fluorescent spectra. The NADO exhibits a significant fluorescence enhancement at 469 nm in presence of Al3þ due to the formation of a complex. Under an optimized condition the detection limit is found to be 0.09 mM. As the concentration of Al3þ is increased, the fluorescence intensity gradually increases due to th...

  • Novel Gomutra (cow urine) mediated synthesis of silver oxide nanoparticles and their enhanced photocatalytic, photoluminescence and antibacterial studies.pdf.jpg
  • Article


  • Authors: Vinay, S.P; Udayabhanu; Nagaraju, G.; Chandrappa, C.P.; Chandrasekhar, N. (2019)

  • This work successfully synthesizes silver oxide (Ag2O) nanoparticles (Nps) using cow urine. The presence of different biological components in cow's urine may acts as fuel for the synthesis of Ag2O Nps by a combustion method at 500 C. This is a rapid and environmentally benign procedure, which has the added advantage of shorter response times and better control over size and shape. The synthesized nanoparticles were characterized by XRD, FTIR, UV-vis, SEM, EDAX and TEM studies and have been tested for photoluminescence and for photocatalytic and biological activities. They show good photocatalytic degradation of methylene blue, due to their sensitivity to absorb light with a wide ban...

  • Novel approaches in cancer management with circulating tumor cell clusters.pdf.jpg
  • Article


  • Authors: Rostami, Peyman; Kashaninejad, Navid; Moshksayan, Khashayar; Saidi, Mohammad Said; Firoozabadi, Baha; Nguyen, Nam-Trung (2019)

  • Tumor metastasis is responsible for the vast majority of cancer-associated morbidities and mortalities. Recent studies have disclosed the higher metastatic potential of circulating tumor cell (CTC) clusters than single CTCs. Despite long-term study on metastasis, the characterizations of its most potent cellular drivers, i.e., CTC clusters have only recently been investigated. The analysis of CTC clusters offers new intuitions into the mechanism of tumor metastasis and can lead to the development of cancer diagnosis and prognosis, drug screening, detection of gene mutations, and anti-metastatic therapeutics. In recent years, considerable attention has been dedicated to the development...

  • Novel Ag-ZnO-La2O2CO3 photocatalysts derived from the Layered Double Hydroxide structure with excellent photocatalytic performance for the degradation of pharmaceutical compounds.pdf.jpg
  • Article


  • Authors: Elhalil, A.; Elmoubarki, R.; Farnane, M.; Machrouhi, A.; Mahjoubi, F.Z.; Sadiq, M.; Qourzal, S.; Abdennouri, M.; Barka, N. (2019)

  • In this work, we have prepared the Ag-ZnO-La2O2CO3 nanomaterials as promising photocatalysts for the photocatalytic degradation of pharmaceutical pollutants. Firstly, a series of ZnAl1-xLax(CO3) (0 x 0.5) layered double hydroxides (LDHs) were synthesized by the co-precipitation method at the component molar ratio of Zn/(Al þ La ¼ 3, where La/Al ¼ 0, 0.25 and 0.5). Photocatalysts were prepared by the calcination of the LDH precursors at different temperatures of 300, 400, 500, 600, 800 and 1000 C. The effects of the La/Al molar ratio and the calcination temperature on the photocatalytic activity of the catalysts were evaluated by the degradation of caffeine as a model pharmaceuti...

  • Nanocellulose based functional materials for supercapacitor applications.pdf.jpg
  • Article


  • Authors: Jose, Jasmine; Thomas, Vinoy; Vinod, Vrinda; Abraham, Rani; Abraham, Susan (2019)

  • Environmental protection and renewable sources for energy conversion and storage remain an important topic nowadays. Major challenges of the 21st century that mankind has to face are certainly energy supply, its storage and conversion in a way that essentially protect the environment. In this scenario the nanocellulose has come up as a sustainable and promising nanomaterial with its unique structure and remarkable properties, such as high specific modulus, excellent stability in most solvents, low toxicity and natural abundance. Its ecofriendly nature, low cost, easy availability and simple synthesis techniques render the nanocellulose as a promising candidate for the fabrication of g...

  • Meander anisotropic magnetoresistance bridge geomagnetic sensors.pdf.jpg
  • Article


  • Authors: Quynh, L.K.; Tu, B.D.; Thuy, N.T.; Viet, D.Q.; Duc, N.H.; Phung, A.T; Huong Giang, D.T. (2019)

  • Anisotropic magnetoresistive (AMR) sensors have long been used for specific industrial applications. Their field detection sensitivity can be improved using magnetic flux concentrators to amplify the magnetic field strength sensed at the sensor. We report on the design and fabrication of a micrometersize meander AMR bridge sensor with an effective AMR branch length of 150. This sensor geometry has enabled us to achieve a magnetic sensitivity as high as 1.25 mV/Oe (or 0.45 mV/V/Oe), which is an enhancement by a factor of about 300 compared to conventional AMR thin film-based sensors. Our study paves a new pathway for the design and application of geomagnetic devices

  • Iron oxide (Fe2O3) nanoparticles modified carbon paste electrode as an advanced material for electrochemical investigation of paracetamol and dopamine.pdf.jpg
  • Article


  • Authors: Vinay, M M; Nayaka, Y. Arthoba (2019)

  • Electrochemical behaviors of paracetamol (PA) and dopamine (DA) have been investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and square wave voltammetry (SWV) using a selective and sensitive iron oxide (Fe2O3) nanoparticle modified carbon paste electrode (IOCPE). The PA and DA showed anodic peak potential at 0.458 V and 0.247 V and cathodic peak potential at 0.088 V and 0.11 V (vs Ag/AgCl), respectively. In DPV mode PA and DA gave linear response over the concentration range of 2 to 150 μM (R2 = 0.998) and 2 to 170 μM (R2 = 0.989), respectively. The limit of detection (LOD = 3s/m) for PA and DA were found to be 1.16 and 0.79 μM, respectively. IOCPE possess ...

  • Hydrogen sulfide sensors based on PANI_f-SWCNT polymer nanocomposite thin films prepared by electrochemical polymerization.pdf.jpg
  • Article


  • Authors: Suhail, Mahdi Hasan; Abdullah, Omed Gh.; Kadhim, Ghada Ayad (2019)

  • Hydrogen sulfide (H2S) gas sensors in the form of thin films based on polyaniline (PAN) incorporated with various concentrations of functionalized single wall carbon nanotubes (f-SWCNT) were prepared by electrochemical polymerization of Aniline monomer with sulfuric acid in an aqueous solution. Surface morphology of the thin film nanocomposites was investigated by Field Emission Scanning Electron Microscopy (FE-SEM) and revealed that the f-SWCNTs were almost uniformly distributed on the surface of the host PANI matrix. The X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy, and Hall effect measurements were used to characterize the synthesized PANI/f-SWCNT nanocom...

  • Heteroatom Doped High Porosity Carbon Nanomaterials as Electrodes for Energy Storage in Electrochemical Capacitors_ A Review.pdf.jpg
  • Article


  • Authors: Abbas, Qaisar; Raza, Rizwan; Shabbir, Imarn; Olabi, A.G. (2019)

  • At present it is indispensable to develop and implement new/state-of-the-art carbon anomaterials as electrode in electrochemical capacitors, since conventional activated carbon based supercapacitor cells cannot fulfil the growing demand of high energy and power densities of electronic devices of present era, as a result of rapid development in this field. Functionalized carbon nanomaterials symbolize the type of materials with huge potential for their use in energy related applications in general and as an electrode active material for electrochemical capacitors in particular. Nitrogen doping of carbons has shown promising results in the field of energy storage in electrochemical capa...

  • Green synthesis of AgZnO nanoparticles_ Structural analysis, hydrogen generation, formylation and biodiesel applications.pdf.jpg
  • Article


  • Authors: Yadav, L.S. Reddy; Pratibha, S.; Manjunath, K.; Shivanna, M.; Ramakrishnappa, T.; Dhananjaya, N.; Nagaraju, G. (2019)

  • The present work reveals the green combustion preparation of the Ag-doped ZnO nanoparticles (NPs) using turmeric root extract as a fuel. The structure and morphology of Ag-doped ZnO NPs were investigated by several analytical techniques such as XRD (X-Ray Diffraction), SEM (Scanning Electron Microscopy), TEM (Transmission Electron Microscopy), FTIR (Fourier Transform Infrared), Raman, XPS (XRay Photoelectron Spectroscopy), and UV-Visible Spectroscopy (UVeVis). From XRD, the crystallite size was found to be about 45 nm which agrees with the TEM results. SEM micrographs reveal the spherical shaped agglomerated particles. XPS measurement anticipates that Ag is mainly in the metallic stat...

  • Glycine-assisted hydrothermal synthesis of NiCo2S4 as an active electrode material for supercapacitors.pdf.jpg
  • Article


  • Authors: Kumar, M. Sathish; Bhagavath, N.; Batabyal, Sudip K.; Kothurkar, Nikhil K. (2019)

  • Nickel cobalt sulfide (NCS) was synthesized from nickel and cobalt nitrate (NCS-1) by a hydrothermal method. In another method, nickel cobalt sulfide (NCS-2) was also synthesized from hydrothermally synthesized nickel cobalt oxide (NCO). The syntheses of NCS-1 and NCO were conducted in the presence of glycine as a templating agent. The NCS and NCO samples were thoroughly characterized by different techniques. XRD studies showed that both NCO and NCS consisted of the cubic crystal phases. Cyclic voltammetry of NCO and NCS revealed that, with an increasing scan rate within the range of 10e100 mV s 1, the specific capacitance of the samples reduced. The specific capacitance of NCS-2, me...

  • Fracture analysis and mechanical properties of three phased glass_epoxy laminates reinforced with multiwalled carbon nanotubes.pdf.jpg
  • Article


  • Authors: Behera, Rohit Pratyush; Rawat, Prashant; Singh, K.K.; Ha, Sung Kyu; Gaurav, Anand; Tiwari, Santosh K. (2019)

  • Herein, we report the use of Multi Wall Carbon Nano Tubes (MWCNTs) as nano-compatibilizers based on their astonishing mechanical properties and ease of processing. To fabricate laminate samples, pure MWCNTs were homogeneously dispersed in the fiber-reinforced plastic (FRP) composite with 0, 0.5, 1 and 1.5 wt. % loading. The laminates were prepared with eight plies (4.0 ± 0.1 mm thickness) using the hand layup technique assisted by the compression moulding method. It was found that the tensile, compressive and inter-laminar shear strength (ILSS) increase by 103.81%, 139.78% and 36.06%, respectively corresponding to 1 wt. % loading of MWCNTs as compared to neat GFRP specimen. However, a...

  • First-principles calculations to investigate structural, electronic, half-metallic and thermodynamic properties of hexagonal UX2O6 (X=Cr,V) compounds.pdf.jpg
  • Article


  • Authors: Berri, Saadi (2019)

  • Full potential linearized augmented plane wave plus local orbital's (FP-LAPW þ LO) method within density functional theory (DFT) is used to investigate the structural, electronic and half-metallic properties of hexagonal UX2O6 (X ¼ Cr,V). Features such as the lattice constant (a and c), bulk modulus and its pressure derivative are reported. The calculated lattice parameters are in good agreement with available experimental results. Band structure and overall densities of states have proved UV2O6 as an indirect half-metallic material with a band gap of 2.88 eV and UCr2O6 as a magnetic semiconductor. The results obtained, make the hexagonal UX2O6 a candidate material for future spintron...

  • Facile solvothermal synthesis and functionalization of polyethylene glycol-coated paramagnetic Gd2(CO3)3 particles and corresponding Gd2O3 nanoparticles for use as MRI contrast agents.pdf.jpg
  • Article


  • Authors: Dougherty, Atika; Nasution, Erika L.Y.; Iskandar, Ferry; Dougherty, Geoff (2019)

  • Paramagnetic particles and nanoparticles have been widely used in bioimaging and biomedical applications. In this paper, functionalized gadolinium carbonate (Gd2(CO3)3) particles with polyethylene glycol (PEG) for use as an MRI contrast agent were produced. These PEGylated particles were also used as a single precursor for synthesizing Gd2O3 nanoparticles by a novel calcination pathway. The morphological, chemical, and structural properties of both the PEGylated Gd2(CO3)3 particles and Gd2O3 nanoparticles were examined using a scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), and energy dispersive X-ray spectroscopy (EDS) techniques. After...

  • Facile fabrication, characterization and efficient photocatalytic activity of surfactant free ZnS, CdS and CuS nanoparticles.pdf.jpg
  • Article


  • Authors: Ayodhya, Dasari; Veerabhadram, Guttena (2019)

  • In this research, some metal sulfide nanoparticles (NPs) including ZnS, CdS and CuS NPs were prepared by a simple and low-cost co-precipitation method for the photocatalytic degradation of Bromothymol blue dye (BTB) under natural sunlight irradiation. The synthesized materials were characterized by XRD, FT-IR, UV-vis DRS, PL, TGA, SEM and TEM techniques for the investigation of structural, electronic, thermal, and morphological properties. The optical absorption and the band gaps of the ZnS, CdS, and CuS NPs were calculated as 3.62 eV, 2.21 eV, and 1.16 eV from the UV-vis DRS. XRD results demonstrate the cubic structure of ZnS NPs, CdS NPs, and the hexagonal structure of CuS NPs in th...

  • Excitonic states and structural stability in two-dimensional hybrid organic-inorganic perovskites.pdf.jpg
  • Article


  • Authors: Lekina, Yulia; Shen, Ze Xiang (2019)

  • Two-dimensional (2D) perovskites are a new class of functional materials that may find applications in various technologically important areas. Due to the better moisture and illumination stability, layered perovskites can be the next generation of materials for solar light-harvesting applications, as well as for light emitting diodes (LEDs). Besides, extended chemical engineering possibilities allow obtaining advanced perovskite materials with desirable functional properties, such as tunable band gap, strong exciton-phonon coupling, white light emission, spin-related effects, etc. A full understanding of the fundamental properties is essential for developing new 2D perovskite-based ...

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