Advanced Materials and Devices : [165]

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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 165
  • item.jpg
  • Article


  • Authors: Sadique, M.J.; Shahjahan, M. (2018)

  • Magnetic properties and electronic structures of the quinary compounds (Sr1-yLay)(Ti0.90D0.10)O3 have been calculated using the Korringa-Kohn-Rostoker coherent potential approximation (KKR-CPA) method, where y represents La concentration (y=0-0.15) and Dindicates the magnetic cations (Mn, Fe). The stability of the magnetic states changes in the opposite manner for the (La, Mn) and (La, Fe) pairs doped into the strontium titanate. The Sr(Ti0.90Fe0.10)O3 (y=0) shows stable ferromagnetic (FM) state with a high Curie temperature (TC) and a large magnetic moment (MM), whereas the spin glass (SG) state is found for Sr(Ti0.90Mn0.10)O3(y=0). A variation of the magnetic properties of (Sr1-yLay...

  • item.jpg
  • Article


  • Authors: Phutanon, N.; Pisitsak, P.; Manuspiya, H.; Ummartyotin, S. (2018)

  • The flower-like CuO materials with a good uniformity were successfully synthesized by the self-assembly method. By using pH ranging from 7 to 9, CuO provided different morphologies. X-ray diffraction (XRD) and Scanning electron microscopy (SEM) revealed the purity and uniformity of the CuO particles, respectively. The particles showflower-like structures composed of CuO nano-sheets. Trans-mission electron microscopy (TEM) confirmed the uniformity of nanosheet-like CuO particles with lattice dimensions of 0.2-0.4 nm. In a preliminary experiment, the rhodamine b degradation was observed by using CuO as a photocatalyst. These semiconducting particles were found to enhance the degradation...

  • item.jpg
  • Article


  • Authors: Bui, Quang Thanh; Ngo, Thi My Hoa; Tran, Thai Hoa (2018)

  • Ultrasound was throughout employed to enhance the co-precipitation process for the synthesis of magnetite nanoparticles (Fe3O4) and the St€ ober approach for the preparation of magnetite-silica nanocomposites (Fe3O4/SiO2). The synthesised magnetite nanoparticles exhibited single-domain nano-crystallites with a uniform spherical morphology, a narrow size distribution (ca. 10 nm), and negligible coercive field (~5 Oe). The prepared magnetite-silica nanocomposites possessed a mono core-shell structure with spherical morphology, biologically coherent size (ca. 100 nm), and discrete mono-domain behaviour. The crystalline structure-magnetic behaviour relationships of the nanomaterials were ...

  • item.jpg
  • Article


  • Authors: Mishra, Raghvendra Kumar; Ha, Sung Kyu; Verma, Kartikey; Tiwari, Santosh K. (2018)

  • Nowadays, the rapid climate change, water pollution and harmful gas emissions are largely caused by the extensive use of petrochemicals and the burning of plastic materials. The government authorities across the globe and experts mentioned that the dumping of plastic waste and non-biodegradable materials is a principal problem of the environmental pollution. In their numerous chemical forms, cellulose and various other biodegradable materials can be possible alternatives to resolve these challenging issues. This review article is an effort to combine the recent developments, concerns and prospective applica-tions of environmentally friendly nano- with micro-structured polymeric materi...

  • item.jpg
  • Article


  • Authors: Sukumaran, Sheena S.; Rekha, C.R.; Resmi, A.N.; Jinesh, K.B.; Gopchandran, K.G. (2018)

  • Graphene-silver (G-Ag) nanocomposites were prepared using liquid phase exfoliation of graphiteflakes followed by a reduction of silver nitrate. The plasmonic characteristics of these nanocomposites are highly sensitive to the Ag concentration in thefilms. Raman spectroscopic investigations indicated that the effect of the surface-enhanced Raman scattering is present significantly in the Raman spectra of G-Ag nanocomposites. The intensity of the D, G, and 2D Raman bands is found to increase with silver con-centration. The interaction between graphene and silver nanoparticles causes the G-band to split depending on the concentration of Ag. Scanning tunneling spectroscopic investigations...

  • item.jpg
  • Article


  • Authors: Priya, G.; Vijayakumari, N.; Sangeetha, R. (2018)

  • A poly (methyl methacrylate) grafted guar gum/mineral substituted hydroxyapatite (PMMA-GG/M-HA) nanocomposite is reported to show enhanced physico-chemical and bio-chemical properties. This nanocomposite offers a possible bone cell integration around it with augmenting fresh bone develop-ment, thus declining the risk of cartilages' structural collapse. In this study, the as-fabricated nano-composite was characterized by using physicochemical strategies. The cell-material boundary of the nanocomposite was observedin vitro with human osteoblast cells, and the cell replication was tested. The nanocomposite promoted the bone cell adhesion and proliferation, improved the mechanical strengt...

  • item.jpg
  • Article


  • Authors: Ranganatha, S.; Munichandraiah, N. (2018)

  • gama-MnS/reduced graphene oxide composites (g-MnS/rGO) were successfully synthesized by a simple one pot solvothermal route. Their structure, morphology and electrochemical properties were studied with respect to applications as a supercapacitor electrode material. The specific capacity ofg-MnS/rGO is 1009 C/g at 1 A/g and retains 82% of initial capacity over 2000 cycles at 2 A/g whereas pristineg-MnS delivers only 480 C/g at 1 A/g with a capacity retention of 64%. Thus,g-MnS/rGO proves to be a promising electrode material, which exhibits high the specific capacity and stable long cycle life.

  • item.jpg
  • Article


  • Authors: Alaneme, Kenneth Kanayo; Umar, Shaibu (2018)

  • The microstructure, mechanical behaviour and damping properties of Cue18Zne7AlexNi alloys (wherex=0.1, 0.2, 0.3 and 0.4) were investigated. The Cu-Zn-Al alloys were produced by casting and then subjected to a homogenization ecold rolling eannealing treatment scheme. Optical-, scanning electron-microscopy and X-ray diffraction analysis were utilized for structural characterization of the alloys, while tensile test, fracture toughness, and hardness measurement were used to assess the me-chanical properties. The results show that all the alloy compositions consisted of the predominating CuZn phase. Sharp edged elongated grain structures were observed in the unmodified and the 0.4% Ni mod...

  • item.jpg
  • Article


  • Authors: Vijayan, Lekshmi; Thomas, Anna; Kumar, K. Shreekrishna; Jinesh, K.B. (2018)

  • Bottom gate, top contact Organic Field Effect Transistors (OFETs) were fabricated using copper phthalocy-anine (CuPc) as an active layer. The electrical properties of OFETs fabricated with CuPc annealed at different annealing temperatures and different channel length to width (L/W) ratios were studied. The transfer characteristics of the devices appear to improve with annealing temperature of CuPc and increasing L/W ratios of the devices. Upon annealing, the field effect mobility increased from 0.03±0.004 cm2/V to 1.3±0.02 cm2/V. Similarly, the interface state density reduced from 5.14±0.39 x 10^11cm^(-2)eV^(-1) for the device fabricatedusing as deposited CuPc, to 2.41±0.05 x 10^11cm^...

  • item.jpg
  • Article


  • Authors: Fates, Rachid; Raskin, Jean-Pierre (2018)

  • We experimentally investigate the carrier transport in back-gated graphene ribbons. The ribbons are monolayer graphene formed by the chemical vapor deposition process and transferred on the SiO2/Si substrate. Electrical measurements show that two categories of electrical behavior are distinguished, respectively, linear and nonlinear. Thein-situ Raman characterization along the ribbon area highlights interesting results for the 2D peaks shift. The Raman shift variation corresponding to the position of the 2D peaks between all measured spectra extends from 2697 cm^(-1) to 2700 cm^(-1) for devices exhibiting a linear behavior. While, for the devices exhibiting a nonlinear behavior, the v...

  • item.jpg
  • Article


  • Authors: Raja, V. Ramasamy; Karthika, A.; Suganthi, A.; Rajarajan, M. (2018)

  • The novel MnWO4/BiOI nanocomposite materials were successfully synthesized by a precipitation deposition method. The as-prepared photocatalyst was characterized by XRD, SEM, EDAX, UV-DRS, FT-IR, TEM and BET techniques. The as-prepared MnWO4/BiOI nanocomposites were further utilized to study the degradation of the Celestin blue aqueous solution under visible-light irradiation. Absorption range and band gap energy, which are responsible for the observed photocatalyst behavior, were investigated by the DRS spectroscopy. The photocatalytic test suggested that MnWO4/BiOI nanocomposites possess a higher activity for the degradation of these pollutants than the pure BiOI and MnWO4under the v...

  • item.jpg
  • Article


  • Authors: Nguyen, Tien Thao; Nguyen, Thi Nhu (2018)

  • A series of MeOx/sepiolite (Me ¼Cu, Cr, Mn, Co, Ni) catalysts was prepared through the deposition eprecipitation and characterized by means of XRD, EDS, SEM, BET, and H2-TPR. The structural charac-terization showed a fine distribution of MeOx metal oxides on magnesium silicate nanobars. The sepiolite-loaded-metal oxide catalysts have been screened for the partial oxidation of benzyl alcohol and shown a good conversion and a very high selectivity to benzaldehyde at mild conditions. Under similar experiments, the catalytic activity of the transition metal oxides on sepiolite decreased in the order of Cr>Co>Cu>Mn>Ni. The productivity of benzaldehyde was associated with the behavior of tr...

  • item.jpg
  • Article


  • Authors: Kumar, K.H. Sudheer; Dhananjaya, N.; Yadav, L.S. Reddy (2018)

  • ZnO nanoparticles were synthesized using esterases containedE. tirucalliplant latex as a fuel. The structural, morphological and spectroscopic studies of the as-synthesized ZnO nanoparticles were analyzed using powder X-ray Diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), UVeVisible absorption and photoluminescence (PL) spectroscopy. The structural parameters were refined by the Rietveld refinement method using PXRD data and confirmed that the prepared compound is pure hexagonal wurtzite structure with space group P63mc(No. 186). The average crystallite size was estimated by Scherrer's and WeH plots and found to be in the range 17-23 and 20-26 nm respectively. The b...

  • item.jpg
  • Article


  • Authors: Chunshom, N.; Chuysinuan, P.; Techasakul, S.; Ummartyotin, S. (2018)

  • Freeze-dried bacterial cellulose and polyvinyl alcohol were successfully prepared. The weight ratios of polyvinyl alcohol to bacterial cellulose were set at 3:1, 5:1 and 10:1. With bacterial cellulose present in the polyvinyl alcohol matrix, H-bonds formed along the cross-linked hydrogel network. The freeze-dried hydrogel presented good compatibility. The hydrogel was thermally stable up to 200oC. Scanningelectron microscopy showed that the hydrogel presented an interconnected network containing various pore sizes. Preliminary experiments on the swelling behavior of the hydrogel were done in DI water, an NaCl solution and a PBS solution. The hydrogel showed good swelling characteristi...

  • item.jpg
  • Article


  • Authors: Dhimish, Mahmoud; Holmes, Violeta; Mather, Peter; Aissa, Chouder; Sibley, Martin (2018)

  • This paper presents a novel technique to examine the impact of Photovoltaic (PV) micro cracks on the performance of the output power for PV solar cells. Initially, the image of the PV micro crack is captured using Electroluminescence (EL) method, then processed by the proposed technique. The technique consists of two stages, thefirst stage combines two images using an OR gate, the first image is the crack-free (healthy) solar cell, whereas the second is the cracked solar cell image. The output image from the first stage is passed into the second stage which uses a 3D graph-based model in order to examine the output power loss in the cracked solar cell. In order to examine the effectiv...

  • item.jpg
  • Article


  • Authors: Archana, S.; Kumar, K.Yogesh; Jayanna, B.K.; Olivera, Sharon; Anand, A.; Prashanth, M.K.; Muralidhara, H.B. (2018)

  • Graphene oxide-Zinc oxide (GO-ZnO) nanocomposite was prepared by a simple hydrothermal method. SEM and TEM analysis showed the presence of wide size range ZnO nanoparticles, which are distributed andfirmly anchored onto the graphene oxide layers. The resulting GO-ZnO nanocomposite showed an extraordinary adsorption capacity and the fast adsorption rates for the removal of methylene blue (MB) and methyl orange (MO) from an aqueous solution. The adsorption isotherm, kinetics and thermody-namics were investigated in detail and the results showed that the adsorption data was bestfitted to Langmuir adsorption isotherm model. The calculated monolayer adsorption capacity is 265.95 and 714.28...

  • item.jpg
  • Article


  • Authors: Kaur, Rupan Preet; Engles, Derick (2018)

  • In this work, we propose fullerene molecule C20as an anchor to fabricate a robust aromatic molecular junction. The electron transport properties of this fullerene terminated aromatic molecular device at zero bias andfinite bias voltage are investigated by using non-equilibrium Green's function combined with density functional theory. Device density of states, transmission spectrum, molecular projected self-consistent Hamiltonian (MPSH) eigen states, mulliken population, IeV and GeV characteristics conclude the electron transport through inelastic tunneling due to shifting of molecular orbitals (MOs) with bias voltage. This transition of MOs leads to variation in the injection gap and ...

  • item.jpg
  • Article


  • Authors: Rekha, C.R.; Nayar, V.U.; Gopchandran, K.G. (2018)

  • We report on the improved stability and yield of silver nanorods with well controlled aspect ratios synthesized using a modified seed mediated approach conducted at room temperature. It is found that the longitudinal surface plasmon resonance of these nanoparticles can be tuned in the spectral range 400-700 nm by varying the concentration of seed particles. The surface enhanced Raman scattering (SERS) activity of these nanorods with varying aspect ratios was tested with four dye molecules viz., crystal violet, malachite green, nile blue chloride and rhodamine-6G, using visible and near-infrared laser excitation sources viz., 514.4 and 784.8 nm, respectively. The mechanism of enhancem...

  • item.jpg
  • Article


  • Authors: Purushothama, H.T.; Nayaka, Y. Arthoba; Vinay, M.M.; Manjunatha, P.; Yathisha, R.O.; Basavarajappa, K.V. (2018)

  • A selective, simple and sensitive electrochemical sensor has been developed using pencil leads (pencil graphite electrode, PGE) for the investigation of chlorpromazine (CPZ). The cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques were employed to study the anodic behaviour of CPZ. The bare PGE showed good electrocatalytic activity towards the determination of CPZ in comparison with alanine and glycine modified PGEs. The PGE showed a well enhanced peak current compared to alanine and glycine modified PGEs for the determination of CPZ. The electroactive surface area, influence of pH, effect of scan rate, electron transfer kinetics and sensitivity have been studi...

  • item.jpg
  • Article


  • Authors: Kamran, Muhammad Arshad (2018)

  • Low-temperature synthesis of ZnTe nanowires (NWs) is a helpful advancement in realization of low cost nanostructured electronic devices. This article reports a novel and low temperature (275oC) synthesis of one-dimensional (1D) NWs of ZnTe on glass substrate. X-ray diffraction (XRD), scanning electron mi-croscopy (SEM) and energy dispersive x-ray analysis (EDX) revealed that prepared NWs have good crystallinity and yield. Optical properties, reported in this article as UV spectroscopy and photo-luminescence (PL), confirm its energy gap of 2.24 eV.

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 165

Advanced Materials and Devices : [165]

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 165
  • item.jpg
  • Article


  • Authors: Sadique, M.J.; Shahjahan, M. (2018)

  • Magnetic properties and electronic structures of the quinary compounds (Sr1-yLay)(Ti0.90D0.10)O3 have been calculated using the Korringa-Kohn-Rostoker coherent potential approximation (KKR-CPA) method, where y represents La concentration (y=0-0.15) and Dindicates the magnetic cations (Mn, Fe). The stability of the magnetic states changes in the opposite manner for the (La, Mn) and (La, Fe) pairs doped into the strontium titanate. The Sr(Ti0.90Fe0.10)O3 (y=0) shows stable ferromagnetic (FM) state with a high Curie temperature (TC) and a large magnetic moment (MM), whereas the spin glass (SG) state is found for Sr(Ti0.90Mn0.10)O3(y=0). A variation of the magnetic properties of (Sr1-yLay...

  • item.jpg
  • Article


  • Authors: Phutanon, N.; Pisitsak, P.; Manuspiya, H.; Ummartyotin, S. (2018)

  • The flower-like CuO materials with a good uniformity were successfully synthesized by the self-assembly method. By using pH ranging from 7 to 9, CuO provided different morphologies. X-ray diffraction (XRD) and Scanning electron microscopy (SEM) revealed the purity and uniformity of the CuO particles, respectively. The particles showflower-like structures composed of CuO nano-sheets. Trans-mission electron microscopy (TEM) confirmed the uniformity of nanosheet-like CuO particles with lattice dimensions of 0.2-0.4 nm. In a preliminary experiment, the rhodamine b degradation was observed by using CuO as a photocatalyst. These semiconducting particles were found to enhance the degradation...

  • item.jpg
  • Article


  • Authors: Bui, Quang Thanh; Ngo, Thi My Hoa; Tran, Thai Hoa (2018)

  • Ultrasound was throughout employed to enhance the co-precipitation process for the synthesis of magnetite nanoparticles (Fe3O4) and the St€ ober approach for the preparation of magnetite-silica nanocomposites (Fe3O4/SiO2). The synthesised magnetite nanoparticles exhibited single-domain nano-crystallites with a uniform spherical morphology, a narrow size distribution (ca. 10 nm), and negligible coercive field (~5 Oe). The prepared magnetite-silica nanocomposites possessed a mono core-shell structure with spherical morphology, biologically coherent size (ca. 100 nm), and discrete mono-domain behaviour. The crystalline structure-magnetic behaviour relationships of the nanomaterials were ...

  • item.jpg
  • Article


  • Authors: Mishra, Raghvendra Kumar; Ha, Sung Kyu; Verma, Kartikey; Tiwari, Santosh K. (2018)

  • Nowadays, the rapid climate change, water pollution and harmful gas emissions are largely caused by the extensive use of petrochemicals and the burning of plastic materials. The government authorities across the globe and experts mentioned that the dumping of plastic waste and non-biodegradable materials is a principal problem of the environmental pollution. In their numerous chemical forms, cellulose and various other biodegradable materials can be possible alternatives to resolve these challenging issues. This review article is an effort to combine the recent developments, concerns and prospective applica-tions of environmentally friendly nano- with micro-structured polymeric materi...

  • item.jpg
  • Article


  • Authors: Sukumaran, Sheena S.; Rekha, C.R.; Resmi, A.N.; Jinesh, K.B.; Gopchandran, K.G. (2018)

  • Graphene-silver (G-Ag) nanocomposites were prepared using liquid phase exfoliation of graphiteflakes followed by a reduction of silver nitrate. The plasmonic characteristics of these nanocomposites are highly sensitive to the Ag concentration in thefilms. Raman spectroscopic investigations indicated that the effect of the surface-enhanced Raman scattering is present significantly in the Raman spectra of G-Ag nanocomposites. The intensity of the D, G, and 2D Raman bands is found to increase with silver con-centration. The interaction between graphene and silver nanoparticles causes the G-band to split depending on the concentration of Ag. Scanning tunneling spectroscopic investigations...

  • item.jpg
  • Article


  • Authors: Priya, G.; Vijayakumari, N.; Sangeetha, R. (2018)

  • A poly (methyl methacrylate) grafted guar gum/mineral substituted hydroxyapatite (PMMA-GG/M-HA) nanocomposite is reported to show enhanced physico-chemical and bio-chemical properties. This nanocomposite offers a possible bone cell integration around it with augmenting fresh bone develop-ment, thus declining the risk of cartilages' structural collapse. In this study, the as-fabricated nano-composite was characterized by using physicochemical strategies. The cell-material boundary of the nanocomposite was observedin vitro with human osteoblast cells, and the cell replication was tested. The nanocomposite promoted the bone cell adhesion and proliferation, improved the mechanical strengt...

  • item.jpg
  • Article


  • Authors: Ranganatha, S.; Munichandraiah, N. (2018)

  • gama-MnS/reduced graphene oxide composites (g-MnS/rGO) were successfully synthesized by a simple one pot solvothermal route. Their structure, morphology and electrochemical properties were studied with respect to applications as a supercapacitor electrode material. The specific capacity ofg-MnS/rGO is 1009 C/g at 1 A/g and retains 82% of initial capacity over 2000 cycles at 2 A/g whereas pristineg-MnS delivers only 480 C/g at 1 A/g with a capacity retention of 64%. Thus,g-MnS/rGO proves to be a promising electrode material, which exhibits high the specific capacity and stable long cycle life.

  • item.jpg
  • Article


  • Authors: Alaneme, Kenneth Kanayo; Umar, Shaibu (2018)

  • The microstructure, mechanical behaviour and damping properties of Cue18Zne7AlexNi alloys (wherex=0.1, 0.2, 0.3 and 0.4) were investigated. The Cu-Zn-Al alloys were produced by casting and then subjected to a homogenization ecold rolling eannealing treatment scheme. Optical-, scanning electron-microscopy and X-ray diffraction analysis were utilized for structural characterization of the alloys, while tensile test, fracture toughness, and hardness measurement were used to assess the me-chanical properties. The results show that all the alloy compositions consisted of the predominating CuZn phase. Sharp edged elongated grain structures were observed in the unmodified and the 0.4% Ni mod...

  • item.jpg
  • Article


  • Authors: Vijayan, Lekshmi; Thomas, Anna; Kumar, K. Shreekrishna; Jinesh, K.B. (2018)

  • Bottom gate, top contact Organic Field Effect Transistors (OFETs) were fabricated using copper phthalocy-anine (CuPc) as an active layer. The electrical properties of OFETs fabricated with CuPc annealed at different annealing temperatures and different channel length to width (L/W) ratios were studied. The transfer characteristics of the devices appear to improve with annealing temperature of CuPc and increasing L/W ratios of the devices. Upon annealing, the field effect mobility increased from 0.03±0.004 cm2/V to 1.3±0.02 cm2/V. Similarly, the interface state density reduced from 5.14±0.39 x 10^11cm^(-2)eV^(-1) for the device fabricatedusing as deposited CuPc, to 2.41±0.05 x 10^11cm^...

  • item.jpg
  • Article


  • Authors: Fates, Rachid; Raskin, Jean-Pierre (2018)

  • We experimentally investigate the carrier transport in back-gated graphene ribbons. The ribbons are monolayer graphene formed by the chemical vapor deposition process and transferred on the SiO2/Si substrate. Electrical measurements show that two categories of electrical behavior are distinguished, respectively, linear and nonlinear. Thein-situ Raman characterization along the ribbon area highlights interesting results for the 2D peaks shift. The Raman shift variation corresponding to the position of the 2D peaks between all measured spectra extends from 2697 cm^(-1) to 2700 cm^(-1) for devices exhibiting a linear behavior. While, for the devices exhibiting a nonlinear behavior, the v...

  • item.jpg
  • Article


  • Authors: Raja, V. Ramasamy; Karthika, A.; Suganthi, A.; Rajarajan, M. (2018)

  • The novel MnWO4/BiOI nanocomposite materials were successfully synthesized by a precipitation deposition method. The as-prepared photocatalyst was characterized by XRD, SEM, EDAX, UV-DRS, FT-IR, TEM and BET techniques. The as-prepared MnWO4/BiOI nanocomposites were further utilized to study the degradation of the Celestin blue aqueous solution under visible-light irradiation. Absorption range and band gap energy, which are responsible for the observed photocatalyst behavior, were investigated by the DRS spectroscopy. The photocatalytic test suggested that MnWO4/BiOI nanocomposites possess a higher activity for the degradation of these pollutants than the pure BiOI and MnWO4under the v...

  • item.jpg
  • Article


  • Authors: Nguyen, Tien Thao; Nguyen, Thi Nhu (2018)

  • A series of MeOx/sepiolite (Me ¼Cu, Cr, Mn, Co, Ni) catalysts was prepared through the deposition eprecipitation and characterized by means of XRD, EDS, SEM, BET, and H2-TPR. The structural charac-terization showed a fine distribution of MeOx metal oxides on magnesium silicate nanobars. The sepiolite-loaded-metal oxide catalysts have been screened for the partial oxidation of benzyl alcohol and shown a good conversion and a very high selectivity to benzaldehyde at mild conditions. Under similar experiments, the catalytic activity of the transition metal oxides on sepiolite decreased in the order of Cr>Co>Cu>Mn>Ni. The productivity of benzaldehyde was associated with the behavior of tr...

  • item.jpg
  • Article


  • Authors: Kumar, K.H. Sudheer; Dhananjaya, N.; Yadav, L.S. Reddy (2018)

  • ZnO nanoparticles were synthesized using esterases containedE. tirucalliplant latex as a fuel. The structural, morphological and spectroscopic studies of the as-synthesized ZnO nanoparticles were analyzed using powder X-ray Diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), UVeVisible absorption and photoluminescence (PL) spectroscopy. The structural parameters were refined by the Rietveld refinement method using PXRD data and confirmed that the prepared compound is pure hexagonal wurtzite structure with space group P63mc(No. 186). The average crystallite size was estimated by Scherrer's and WeH plots and found to be in the range 17-23 and 20-26 nm respectively. The b...

  • item.jpg
  • Article


  • Authors: Chunshom, N.; Chuysinuan, P.; Techasakul, S.; Ummartyotin, S. (2018)

  • Freeze-dried bacterial cellulose and polyvinyl alcohol were successfully prepared. The weight ratios of polyvinyl alcohol to bacterial cellulose were set at 3:1, 5:1 and 10:1. With bacterial cellulose present in the polyvinyl alcohol matrix, H-bonds formed along the cross-linked hydrogel network. The freeze-dried hydrogel presented good compatibility. The hydrogel was thermally stable up to 200oC. Scanningelectron microscopy showed that the hydrogel presented an interconnected network containing various pore sizes. Preliminary experiments on the swelling behavior of the hydrogel were done in DI water, an NaCl solution and a PBS solution. The hydrogel showed good swelling characteristi...

  • item.jpg
  • Article


  • Authors: Dhimish, Mahmoud; Holmes, Violeta; Mather, Peter; Aissa, Chouder; Sibley, Martin (2018)

  • This paper presents a novel technique to examine the impact of Photovoltaic (PV) micro cracks on the performance of the output power for PV solar cells. Initially, the image of the PV micro crack is captured using Electroluminescence (EL) method, then processed by the proposed technique. The technique consists of two stages, thefirst stage combines two images using an OR gate, the first image is the crack-free (healthy) solar cell, whereas the second is the cracked solar cell image. The output image from the first stage is passed into the second stage which uses a 3D graph-based model in order to examine the output power loss in the cracked solar cell. In order to examine the effectiv...

  • item.jpg
  • Article


  • Authors: Archana, S.; Kumar, K.Yogesh; Jayanna, B.K.; Olivera, Sharon; Anand, A.; Prashanth, M.K.; Muralidhara, H.B. (2018)

  • Graphene oxide-Zinc oxide (GO-ZnO) nanocomposite was prepared by a simple hydrothermal method. SEM and TEM analysis showed the presence of wide size range ZnO nanoparticles, which are distributed andfirmly anchored onto the graphene oxide layers. The resulting GO-ZnO nanocomposite showed an extraordinary adsorption capacity and the fast adsorption rates for the removal of methylene blue (MB) and methyl orange (MO) from an aqueous solution. The adsorption isotherm, kinetics and thermody-namics were investigated in detail and the results showed that the adsorption data was bestfitted to Langmuir adsorption isotherm model. The calculated monolayer adsorption capacity is 265.95 and 714.28...

  • item.jpg
  • Article


  • Authors: Kaur, Rupan Preet; Engles, Derick (2018)

  • In this work, we propose fullerene molecule C20as an anchor to fabricate a robust aromatic molecular junction. The electron transport properties of this fullerene terminated aromatic molecular device at zero bias andfinite bias voltage are investigated by using non-equilibrium Green's function combined with density functional theory. Device density of states, transmission spectrum, molecular projected self-consistent Hamiltonian (MPSH) eigen states, mulliken population, IeV and GeV characteristics conclude the electron transport through inelastic tunneling due to shifting of molecular orbitals (MOs) with bias voltage. This transition of MOs leads to variation in the injection gap and ...

  • item.jpg
  • Article


  • Authors: Rekha, C.R.; Nayar, V.U.; Gopchandran, K.G. (2018)

  • We report on the improved stability and yield of silver nanorods with well controlled aspect ratios synthesized using a modified seed mediated approach conducted at room temperature. It is found that the longitudinal surface plasmon resonance of these nanoparticles can be tuned in the spectral range 400-700 nm by varying the concentration of seed particles. The surface enhanced Raman scattering (SERS) activity of these nanorods with varying aspect ratios was tested with four dye molecules viz., crystal violet, malachite green, nile blue chloride and rhodamine-6G, using visible and near-infrared laser excitation sources viz., 514.4 and 784.8 nm, respectively. The mechanism of enhancem...

  • item.jpg
  • Article


  • Authors: Purushothama, H.T.; Nayaka, Y. Arthoba; Vinay, M.M.; Manjunatha, P.; Yathisha, R.O.; Basavarajappa, K.V. (2018)

  • A selective, simple and sensitive electrochemical sensor has been developed using pencil leads (pencil graphite electrode, PGE) for the investigation of chlorpromazine (CPZ). The cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques were employed to study the anodic behaviour of CPZ. The bare PGE showed good electrocatalytic activity towards the determination of CPZ in comparison with alanine and glycine modified PGEs. The PGE showed a well enhanced peak current compared to alanine and glycine modified PGEs for the determination of CPZ. The electroactive surface area, influence of pH, effect of scan rate, electron transfer kinetics and sensitivity have been studi...

  • item.jpg
  • Article


  • Authors: Kamran, Muhammad Arshad (2018)

  • Low-temperature synthesis of ZnTe nanowires (NWs) is a helpful advancement in realization of low cost nanostructured electronic devices. This article reports a novel and low temperature (275oC) synthesis of one-dimensional (1D) NWs of ZnTe on glass substrate. X-ray diffraction (XRD), scanning electron mi-croscopy (SEM) and energy dispersive x-ray analysis (EDX) revealed that prepared NWs have good crystallinity and yield. Optical properties, reported in this article as UV spectroscopy and photo-luminescence (PL), confirm its energy gap of 2.24 eV.

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 165