Journal of Materials Science: Materials in Electronics, 2021
In the present study, we synthesized Cu2ZnGeS4 (CZGS) nanorods by simple solvothermal method. The... more In the present study, we synthesized Cu2ZnGeS4 (CZGS) nanorods by simple solvothermal method. The physical properties, such as crystalline structure, band gap, morphology, and chemical composition, were studied using different characterization techniques. The structural characterization by X-ray diffraction showed predominantly orthorhombic phase which was additionally verified by Raman analysis. The estimated crystalline size of the nanorods was approximately 14–17 nm. Scanning electron microscopy images revealed typically nanorod-like structures. The orthorhombic symmetry of CZGS has been further confirmed from high-resolution TEM results. The nanorods demonstrated good UV–Vis light absorption with optical band gap 2.01 eV. The photocatalytic efficiency of CZGS nanoparticles was evaluated from the photodegradation of methylene blue (MB) using H2O2 in the solution; almost 90% of the MB was degraded in 180 min.
In this study we present the reaction mechanism of Cu2ZnSnSe4 (CZTSe) nanoparticles synthesized b... more In this study we present the reaction mechanism of Cu2ZnSnSe4 (CZTSe) nanoparticles synthesized by microwave-assisted chemical synthesis. We performed reactions every 10 minutes in order to identify different phases during quaternary CZTSe formation. The powder samples were analyzed by x-ray diffraction (XRD), Raman spectroscopy, energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The results showed that in the first minutes copper phases are predominant, then copper and tin secondary phases react to form ternary phase. The quaternary phase is formed at 50 minutes while ternary and secondary phases are consumed. At 60 minutes pure quaternary CZTSe phase is present. After 60 minutes the quaternary phase decomposes in the previous ternary and secondary phases, which indicates that 60 minutes is ideal reaction time. The EDS analysis of pure quaternary nanocrystals (CZTSe) showed stoichiometric relations similar to the...
We report the first synthesis of highly stable and efficiently recyclable multifunctional adsorbe... more We report the first synthesis of highly stable and efficiently recyclable multifunctional adsorbents containing FeCo/GC nanoparticles with the strongest magnetic properties.
In this study, we have reported the synthesis of Cu2ZnSnSe4 (CZTSe), Cu2ZnSnS4 (CZTS) and Cu2ZnSn... more In this study, we have reported the synthesis of Cu2ZnSnSe4 (CZTSe), Cu2ZnSnS4 (CZTS) and Cu2ZnSn(S,Se)4 (CZTSSe) nanocrystals with tunable band gap and composition obtained by solvothermal method. The crystalline structure, composition, morphology and optical properties of the nanoparticles were characterized by X-ray diffraction (XRD), Raman scattering, energy dispersive X-ray spectroscopy, transmission electron microscopy and diffuse reflectance (DR) spectroscopy. While the XRD patterns of CZTS and CZTSe nanoparticles prepared with elemental S/Se powder revealed the presence of phase pure nanoparticles, the CZTSSe nanoparticles obtained using a mixture of S and Se, were found to contain many secondary phases under the same synthesis protocol. Formation of impurity phases in CZTSSe sample, can be avoided by using a mixture of 1-dodecanethiol (DT; CH3(CH2)11SH)/oleylamine (OLA) instead of S powder and following the same experimental procedure. The incorporation of S in CZTSe nanocrystals prepared in presence of DDT/OLA mixture was confirmed through structural and optical characterizations. The optical properties of the quaternary chalcogenide nanocrystals were found to vary with the chemical composition of the material.
Abstract In order to investigate the effect of doping concentration on the luminescence behavior ... more Abstract In order to investigate the effect of doping concentration on the luminescence behavior of yttrium oxide (Y2O3) europium (Eu) doped nanoparticles were prepared by co-precipitation method. Incorporation of Eu ion in Y2O3 matrix is clearly reflected in structural and optical properties of the doped Y2O3 phosphor. Cathodoluminescence (CL) spectroscopy proves the presence of strong Eu3+ emissions along with the presence of an additional weak band corresponding to electronic transitions 4f65d1 (7FJ) – 4f7 (8S7/2) of the Eu2+. The presence of Eu3+ and Eu2+ ions in Y2O3 nanoparticles have been additionally confirmed by XPS analysis. Luminescence band corresponding to Eu3+ ions appears in both CL and photoluminescence (PL) spectra, covering the orange-red emissions from 580 to 710 nm. Vibrational properties analyzed through Raman spectroscopy have revealed the evolution of different peaks associated with Eu emission in the doped Y2O3 nanocrystals.
Silver-doping in SnS films can improve the semiconducting properties of SnS films. Based on our p... more Silver-doping in SnS films can improve the semiconducting properties of SnS films. Based on our previous research, SnS:Ag thin films were deposited on ITO coated glass by pulse electro-deposition in order to study their structural, optical and electrical properties. SnS:Ag thin films were characterized with X-ray diffraction (XRD) , Scanning Electron Microscope (SEM) and some other methods. The primary composition of the films is SnS, but maybe there is a little quantity of SnS2, Ag8SnS6 and other compounds. The doped films exhibit good crystallization with big grain size. They have an optical gap of 1.66~1.89eV and a high absorption coefficient (α>5×104cm-1). Hall measurement has shown that all the samples are of p-type conduction with low resistivity of the order of 10-3Ω•cm, and the carrier concentration increases to 1019cm-3 after Ag-doping. In conclusion, the semiconducting properties of the SnS films have been improved by silver-doping. Thus, SnS:Ag thin films can be used as s...
2019 IEEE 14th Nanotechnology Materials and Devices Conference (NMDC), 2019
BiFe<inf>0.99</inf>Cr<inf>0.01</inf>O<inf>3</inf> thin film i... more BiFe<inf>0.99</inf>Cr<inf>0.01</inf>O<inf>3</inf> thin film is deposited on FTO glass using sol-gel technique. The deposited film is used in Ag/ BiFe<inf>0.99</inf>Cr<inf>0.01</inf>O<inf>3</inf>/FTO configuration to understand its potential as RRAM device. The device showed forming free bipolar RRAM characteristics with Ion/Ioff~80. The device showed non-volatile behaviour by maintaining its LRS and HRS states for 10<sup>4</sup> s. The device exhibits excellent reproducibility up to 100 cycles and reliability of V<inf>set</inf> and V<inf>reset</inf> voltage is observed. The endurance characteristics for 200 cycles ensures the stability of the device, further, conduction mechanism is attributed to filament formation and switching mechanism is assigned to migration of silver ion inside the film.
In this study we present the synthesis of Cu2ZnSnSe4 (CZTSe) nanoparticles by microwaveassisted c... more In this study we present the synthesis of Cu2ZnSnSe4 (CZTSe) nanoparticles by microwaveassisted chemical synthesis employing organic solvents. The effect of reaction time, reactant concentration, solvent and additives (inorganic material) was studied on the structural and optical properties of the nanomaterials. The powder samples were analyzed by X-ray diffraction (XRD), Raman spectroscopy, X-ray energy dispersive spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The results show that the synthesis performed with triethanolamine and deionized water is better than others solvents, producing nanocrystals of quaternary phase (CZTSe) with stoichiometric relations similar to the reported research in the literature, which falls in the range of Cu/(Zn+Sn): 0.8 1.0, Zn/Sn: 1.0 1.20. The nanoparticles of CZTSe synthesized in this study present desirable properties in order to use them in solar cell and photoelectrochemical cell applications.
Journal of Materials Science: Materials in Electronics, 2021
In the present study, we synthesized Cu2ZnGeS4 (CZGS) nanorods by simple solvothermal method. The... more In the present study, we synthesized Cu2ZnGeS4 (CZGS) nanorods by simple solvothermal method. The physical properties, such as crystalline structure, band gap, morphology, and chemical composition, were studied using different characterization techniques. The structural characterization by X-ray diffraction showed predominantly orthorhombic phase which was additionally verified by Raman analysis. The estimated crystalline size of the nanorods was approximately 14–17 nm. Scanning electron microscopy images revealed typically nanorod-like structures. The orthorhombic symmetry of CZGS has been further confirmed from high-resolution TEM results. The nanorods demonstrated good UV–Vis light absorption with optical band gap 2.01 eV. The photocatalytic efficiency of CZGS nanoparticles was evaluated from the photodegradation of methylene blue (MB) using H2O2 in the solution; almost 90% of the MB was degraded in 180 min.
In this study we present the reaction mechanism of Cu2ZnSnSe4 (CZTSe) nanoparticles synthesized b... more In this study we present the reaction mechanism of Cu2ZnSnSe4 (CZTSe) nanoparticles synthesized by microwave-assisted chemical synthesis. We performed reactions every 10 minutes in order to identify different phases during quaternary CZTSe formation. The powder samples were analyzed by x-ray diffraction (XRD), Raman spectroscopy, energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The results showed that in the first minutes copper phases are predominant, then copper and tin secondary phases react to form ternary phase. The quaternary phase is formed at 50 minutes while ternary and secondary phases are consumed. At 60 minutes pure quaternary CZTSe phase is present. After 60 minutes the quaternary phase decomposes in the previous ternary and secondary phases, which indicates that 60 minutes is ideal reaction time. The EDS analysis of pure quaternary nanocrystals (CZTSe) showed stoichiometric relations similar to the...
We report the first synthesis of highly stable and efficiently recyclable multifunctional adsorbe... more We report the first synthesis of highly stable and efficiently recyclable multifunctional adsorbents containing FeCo/GC nanoparticles with the strongest magnetic properties.
In this study, we have reported the synthesis of Cu2ZnSnSe4 (CZTSe), Cu2ZnSnS4 (CZTS) and Cu2ZnSn... more In this study, we have reported the synthesis of Cu2ZnSnSe4 (CZTSe), Cu2ZnSnS4 (CZTS) and Cu2ZnSn(S,Se)4 (CZTSSe) nanocrystals with tunable band gap and composition obtained by solvothermal method. The crystalline structure, composition, morphology and optical properties of the nanoparticles were characterized by X-ray diffraction (XRD), Raman scattering, energy dispersive X-ray spectroscopy, transmission electron microscopy and diffuse reflectance (DR) spectroscopy. While the XRD patterns of CZTS and CZTSe nanoparticles prepared with elemental S/Se powder revealed the presence of phase pure nanoparticles, the CZTSSe nanoparticles obtained using a mixture of S and Se, were found to contain many secondary phases under the same synthesis protocol. Formation of impurity phases in CZTSSe sample, can be avoided by using a mixture of 1-dodecanethiol (DT; CH3(CH2)11SH)/oleylamine (OLA) instead of S powder and following the same experimental procedure. The incorporation of S in CZTSe nanocrystals prepared in presence of DDT/OLA mixture was confirmed through structural and optical characterizations. The optical properties of the quaternary chalcogenide nanocrystals were found to vary with the chemical composition of the material.
Abstract In order to investigate the effect of doping concentration on the luminescence behavior ... more Abstract In order to investigate the effect of doping concentration on the luminescence behavior of yttrium oxide (Y2O3) europium (Eu) doped nanoparticles were prepared by co-precipitation method. Incorporation of Eu ion in Y2O3 matrix is clearly reflected in structural and optical properties of the doped Y2O3 phosphor. Cathodoluminescence (CL) spectroscopy proves the presence of strong Eu3+ emissions along with the presence of an additional weak band corresponding to electronic transitions 4f65d1 (7FJ) – 4f7 (8S7/2) of the Eu2+. The presence of Eu3+ and Eu2+ ions in Y2O3 nanoparticles have been additionally confirmed by XPS analysis. Luminescence band corresponding to Eu3+ ions appears in both CL and photoluminescence (PL) spectra, covering the orange-red emissions from 580 to 710 nm. Vibrational properties analyzed through Raman spectroscopy have revealed the evolution of different peaks associated with Eu emission in the doped Y2O3 nanocrystals.
Silver-doping in SnS films can improve the semiconducting properties of SnS films. Based on our p... more Silver-doping in SnS films can improve the semiconducting properties of SnS films. Based on our previous research, SnS:Ag thin films were deposited on ITO coated glass by pulse electro-deposition in order to study their structural, optical and electrical properties. SnS:Ag thin films were characterized with X-ray diffraction (XRD) , Scanning Electron Microscope (SEM) and some other methods. The primary composition of the films is SnS, but maybe there is a little quantity of SnS2, Ag8SnS6 and other compounds. The doped films exhibit good crystallization with big grain size. They have an optical gap of 1.66~1.89eV and a high absorption coefficient (α>5×104cm-1). Hall measurement has shown that all the samples are of p-type conduction with low resistivity of the order of 10-3Ω•cm, and the carrier concentration increases to 1019cm-3 after Ag-doping. In conclusion, the semiconducting properties of the SnS films have been improved by silver-doping. Thus, SnS:Ag thin films can be used as s...
2019 IEEE 14th Nanotechnology Materials and Devices Conference (NMDC), 2019
BiFe<inf>0.99</inf>Cr<inf>0.01</inf>O<inf>3</inf> thin film i... more BiFe<inf>0.99</inf>Cr<inf>0.01</inf>O<inf>3</inf> thin film is deposited on FTO glass using sol-gel technique. The deposited film is used in Ag/ BiFe<inf>0.99</inf>Cr<inf>0.01</inf>O<inf>3</inf>/FTO configuration to understand its potential as RRAM device. The device showed forming free bipolar RRAM characteristics with Ion/Ioff~80. The device showed non-volatile behaviour by maintaining its LRS and HRS states for 10<sup>4</sup> s. The device exhibits excellent reproducibility up to 100 cycles and reliability of V<inf>set</inf> and V<inf>reset</inf> voltage is observed. The endurance characteristics for 200 cycles ensures the stability of the device, further, conduction mechanism is attributed to filament formation and switching mechanism is assigned to migration of silver ion inside the film.
In this study we present the synthesis of Cu2ZnSnSe4 (CZTSe) nanoparticles by microwaveassisted c... more In this study we present the synthesis of Cu2ZnSnSe4 (CZTSe) nanoparticles by microwaveassisted chemical synthesis employing organic solvents. The effect of reaction time, reactant concentration, solvent and additives (inorganic material) was studied on the structural and optical properties of the nanomaterials. The powder samples were analyzed by X-ray diffraction (XRD), Raman spectroscopy, X-ray energy dispersive spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The results show that the synthesis performed with triethanolamine and deionized water is better than others solvents, producing nanocrystals of quaternary phase (CZTSe) with stoichiometric relations similar to the reported research in the literature, which falls in the range of Cu/(Zn+Sn): 0.8 1.0, Zn/Sn: 1.0 1.20. The nanoparticles of CZTSe synthesized in this study present desirable properties in order to use them in solar cell and photoelectrochemical cell applications.
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