Arumainathan Stephen | University of Madras (original) (raw)
Papers by Arumainathan Stephen
Process Biochemistry, 2022
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ChemistrySelect, 2017
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Advanced Materials Research, 2012
Nanorods of ZnO/CeO2 were synthesized by thermal decomposition method. The decomposition temperat... more Nanorods of ZnO/CeO2 were synthesized by thermal decomposition method. The decomposition temperature and formation of composite material were confirmed by the thermogravimetric analysis (TGA) before the synthesis process. The prepared samples were characterized by different techniques. The structural and morphological properties of ZnO/CeO2 nanorods were confirmed by X-ray diffraction (XRD) and high resolution scanning electron microscopy (HR-SEM). The chemical composition and specific surface area analysis were done by energy dispersive X-ray spectroscopy (EDX) and Brunauer–Emmett–Teller (BET) method. Further the catalyst was used for photocatalytic degradation of organic dye under visible light irradiation
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Scientific reports, Aug 16, 2016
In this study, pure ZnO, CeO2 and ZnO/CeO2 nanocomposites were synthesized using a thermal decomp... more In this study, pure ZnO, CeO2 and ZnO/CeO2 nanocomposites were synthesized using a thermal decomposition method and subsequently characterized using different standard techniques. High-resolution X-ray photoelectron spectroscopy measurements confirmed the oxidation states and presence of Zn(2+), Ce(4+), Ce(3+) and different bonded oxygen species in the nanocomposites. The prepared pure ZnO and CeO2 as well as the ZnO/CeO2 nanocomposites with various proportions of ZnO and CeO2 were tested for photocatalytic degradation of methyl orange, methylene blue and phenol under visible-light irradiation. The optimized and highly efficient ZnO/CeO2 (90:10) nanocomposite exhibited enhanced photocatalytic degradation performance for the degradation of methyl orange, methylene blue, and phenol as well as industrial textile effluent compared to ZnO, CeO2 and the other investigated nanocomposites. Moreover, the recycling results demonstrate that the ZnO/CeO2 (90:10) nanocomposite exhibited good sta...
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Materials Science and Engineering: B, 1998
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Journal of Applied Physics, 2008
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Journal of Physics and …, 1991
... Perganon Press pic POSITRON ANGULAR CORRELATION STUDIES ON RARE EARTH SUBSTITUTED 123 COMPOUN... more ... Perganon Press pic POSITRON ANGULAR CORRELATION STUDIES ON RARE EARTH SUBSTITUTED 123 COMPOUNDS T. NAGARAJAN, S. SRENIVASAN, V. SRIDHARAN, V. PRABHA, R. USHA, B. JAYAMALA, K. NANDHINI AND A. STEPHEN ... CNR Rao], BlackweU Sd. ...
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Journal of colloid and interface science, Jan 15, 2015
A ternary ZnO/Ag/CdO nanocomposite was synthesized using thermal decomposition method. The result... more A ternary ZnO/Ag/CdO nanocomposite was synthesized using thermal decomposition method. The resulting nanocomposite was characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, UV-Vis spectroscopy, and X-ray photoelectron spectroscopy. The ZnO/Ag/CdO nanocomposite exhibited enhanced photocatalytic activity under visible light irradiation for the degradation of methyl orange and methylene blue compared with binary ZnO/Ag and ZnO/CdO nanocomposites. The ZnO/Ag/CdO nanocomposite was also used for the degradation of the industrial textile effluent (real sample analysis) and degraded more than 90% in 210 min under visible light irradiation. The small size, high surface area and synergistic effect in the ZnO/Ag/CdO nanocomposite is responsible for high photocatalytic activity. These results also showed that the Ag nanoparticles induced visible light activity and facilitated efficient charge separation in the ZnO/Ag/CdO nanocomposite...
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Journal of Molecular Liquids, 2014
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Scientific Reports
In this study, pure ZnO, CeO2 and ZnO/CeO2 nanocomposites were synthesized using a thermal decomp... more In this study, pure ZnO, CeO2 and ZnO/CeO2 nanocomposites were synthesized using a thermal decomposition method and subsequently characterized using different standard techniques. High-resolution X-ray photoelectron spectroscopy measurements confirmed the oxidation states and presence of Zn2+ , Ce4+ , Ce3+ and different bonded oxygen species in the nanocomposites. The prepared pure ZnO and CeO2 as well as the ZnO/CeO2 nanocomposites with various proportions of ZnO and CeO2 were tested for photocatalytic degradation of methyl orange, methylene blue and phenol under visible-light irradiation. The optimized and highly efficient ZnO/CeO2 (90:10) nanocomposite exhibited enhanced photocatalytic degradation performance for the degradation of methyl orange, methylene blue, and phenol as well as industrial textile effluent compared to ZnO, CeO2 and the other investigated nanocomposites. Moreover, the recycling results demonstrate that the ZnO/CeO2 (90:10) nanocomposite exhibited good stabili...
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ChemistrySelect
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Journal of colloid and interface science, Jan 15, 2015
A ternary ZnO/Ag/CdO nanocomposite was synthesized using thermal decomposition method. The result... more A ternary ZnO/Ag/CdO nanocomposite was synthesized using thermal decomposition method. The resulting nanocomposite was characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, UV-Vis spectroscopy, and X-ray photoelectron spectroscopy. The ZnO/Ag/CdO nanocomposite exhibited enhanced photocatalytic activity under visible light irradiation for the degradation of methyl orange and methylene blue compared with binary ZnO/Ag and ZnO/CdO nanocomposites. The ZnO/Ag/CdO nanocomposite was also used for the degradation of the industrial textile effluent (real sample analysis) and degraded more than 90% in 210 min under visible light irradiation. The small size, high surface area and synergistic effect in the ZnO/Ag/CdO nanocomposite is responsible for high photocatalytic activity. These results also showed that the Ag nanoparticles induced visible light activity and facilitated efficient charge separation in the ZnO/Ag/CdO nanocomposite...
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Alloy nanostructures formed by magnetic and nonmagnetic components play a significant role in sen... more Alloy nanostructures formed by magnetic and nonmagnetic components play a significant role in sensor applications due to their unique magnetic properties. In this study cobalt-silver nanomaterial has been synthesized by chemical reduction using sodium borohydride, though Co and Ag are immiscible according to their phase diagram. The materials prepared with different precursor compositions have been analysed to determine the structure and the magnetic properties. It is observed that the alloy samples show room temperature ferromagnetism. The surface morphology of the as prepared samples was studied from the SEM micrographs. This is a simple but an effective method to prepare magnetic Co-Ag nanomaterials in bulk quantities at room temperature.
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The Ni3Mn type of ordering in nanocrystalline NiMn films with different compositions prepared by ... more The Ni3Mn type of ordering in nanocrystalline NiMn films with different compositions prepared by
electrodeposition was investigated by using x-ray diffraction, differential scanning calorimetry
DSC, thermogravimetric analyzer, Mössbauer spectroscopy, and transmission electron
microscopy. The investigations reveal the existence of composition-induced Ni3Mn-type ordering in
the as-deposited film of 76.2 at. % Ni. The atomic disorder is characterized by an exothermic effect
in DSC. An analysis of the broad exothermic transition reveals the stages of phase transformation
leading to ordering. The Curie temperatures of the alloys were determined from thermomagnetic
measurements, the maximum value obtained for the ordered sample. Mössbauer spectroscopy at
room temperature reveals ordered ferromagnetic and disordered paramagnetic phases in the
as-deposited films. Superlattice reflections observed in selected area electron diffraction pattern for
the 76.2 at. % Ni film alone further support the observation of composition-specific atomic
ordering. © 2008 American Institute of Physics. DOI: 10.1063/1.2844211
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Polymer-plastics Technology and Engineering, 2012
The preparation and characterization of composite polymer electrolytes (CPE) of Polyindole–Fe2O3–... more The preparation and characterization of composite polymer electrolytes (CPE) of Polyindole–Fe2O3–LiClO4 for different concentrations of indole have been reported. Formation of polyindole –Fe2O3 composite was confirmed by FTIR and XRD. The surface morphology of the composite was studied by SEM. Its microstructure and chemical analyses were performed by transmission electron microscopy and electron energy loss spectroscopy respectively. Ionic conductivity of CPE analyzed by impedance spectroscopy was found to depend on the indole concentration. This type of CPE system can be used as a solid electrolyte in lithium ion polymer batteries.
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Process Biochemistry, 2022
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ChemistrySelect, 2017
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Advanced Materials Research, 2012
Nanorods of ZnO/CeO2 were synthesized by thermal decomposition method. The decomposition temperat... more Nanorods of ZnO/CeO2 were synthesized by thermal decomposition method. The decomposition temperature and formation of composite material were confirmed by the thermogravimetric analysis (TGA) before the synthesis process. The prepared samples were characterized by different techniques. The structural and morphological properties of ZnO/CeO2 nanorods were confirmed by X-ray diffraction (XRD) and high resolution scanning electron microscopy (HR-SEM). The chemical composition and specific surface area analysis were done by energy dispersive X-ray spectroscopy (EDX) and Brunauer–Emmett–Teller (BET) method. Further the catalyst was used for photocatalytic degradation of organic dye under visible light irradiation
Bookmarks Related papers MentionsView impact
Scientific reports, Aug 16, 2016
In this study, pure ZnO, CeO2 and ZnO/CeO2 nanocomposites were synthesized using a thermal decomp... more In this study, pure ZnO, CeO2 and ZnO/CeO2 nanocomposites were synthesized using a thermal decomposition method and subsequently characterized using different standard techniques. High-resolution X-ray photoelectron spectroscopy measurements confirmed the oxidation states and presence of Zn(2+), Ce(4+), Ce(3+) and different bonded oxygen species in the nanocomposites. The prepared pure ZnO and CeO2 as well as the ZnO/CeO2 nanocomposites with various proportions of ZnO and CeO2 were tested for photocatalytic degradation of methyl orange, methylene blue and phenol under visible-light irradiation. The optimized and highly efficient ZnO/CeO2 (90:10) nanocomposite exhibited enhanced photocatalytic degradation performance for the degradation of methyl orange, methylene blue, and phenol as well as industrial textile effluent compared to ZnO, CeO2 and the other investigated nanocomposites. Moreover, the recycling results demonstrate that the ZnO/CeO2 (90:10) nanocomposite exhibited good sta...
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Materials Science and Engineering: B, 1998
Bookmarks Related papers MentionsView impact
Journal of Applied Physics, 2008
Bookmarks Related papers MentionsView impact
Journal of Physics and …, 1991
... Perganon Press pic POSITRON ANGULAR CORRELATION STUDIES ON RARE EARTH SUBSTITUTED 123 COMPOUN... more ... Perganon Press pic POSITRON ANGULAR CORRELATION STUDIES ON RARE EARTH SUBSTITUTED 123 COMPOUNDS T. NAGARAJAN, S. SRENIVASAN, V. SRIDHARAN, V. PRABHA, R. USHA, B. JAYAMALA, K. NANDHINI AND A. STEPHEN ... CNR Rao], BlackweU Sd. ...
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Journal of colloid and interface science, Jan 15, 2015
A ternary ZnO/Ag/CdO nanocomposite was synthesized using thermal decomposition method. The result... more A ternary ZnO/Ag/CdO nanocomposite was synthesized using thermal decomposition method. The resulting nanocomposite was characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, UV-Vis spectroscopy, and X-ray photoelectron spectroscopy. The ZnO/Ag/CdO nanocomposite exhibited enhanced photocatalytic activity under visible light irradiation for the degradation of methyl orange and methylene blue compared with binary ZnO/Ag and ZnO/CdO nanocomposites. The ZnO/Ag/CdO nanocomposite was also used for the degradation of the industrial textile effluent (real sample analysis) and degraded more than 90% in 210 min under visible light irradiation. The small size, high surface area and synergistic effect in the ZnO/Ag/CdO nanocomposite is responsible for high photocatalytic activity. These results also showed that the Ag nanoparticles induced visible light activity and facilitated efficient charge separation in the ZnO/Ag/CdO nanocomposite...
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Journal of Molecular Liquids, 2014
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Scientific Reports
In this study, pure ZnO, CeO2 and ZnO/CeO2 nanocomposites were synthesized using a thermal decomp... more In this study, pure ZnO, CeO2 and ZnO/CeO2 nanocomposites were synthesized using a thermal decomposition method and subsequently characterized using different standard techniques. High-resolution X-ray photoelectron spectroscopy measurements confirmed the oxidation states and presence of Zn2+ , Ce4+ , Ce3+ and different bonded oxygen species in the nanocomposites. The prepared pure ZnO and CeO2 as well as the ZnO/CeO2 nanocomposites with various proportions of ZnO and CeO2 were tested for photocatalytic degradation of methyl orange, methylene blue and phenol under visible-light irradiation. The optimized and highly efficient ZnO/CeO2 (90:10) nanocomposite exhibited enhanced photocatalytic degradation performance for the degradation of methyl orange, methylene blue, and phenol as well as industrial textile effluent compared to ZnO, CeO2 and the other investigated nanocomposites. Moreover, the recycling results demonstrate that the ZnO/CeO2 (90:10) nanocomposite exhibited good stabili...
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ChemistrySelect
Bookmarks Related papers MentionsView impact
Journal of colloid and interface science, Jan 15, 2015
A ternary ZnO/Ag/CdO nanocomposite was synthesized using thermal decomposition method. The result... more A ternary ZnO/Ag/CdO nanocomposite was synthesized using thermal decomposition method. The resulting nanocomposite was characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, UV-Vis spectroscopy, and X-ray photoelectron spectroscopy. The ZnO/Ag/CdO nanocomposite exhibited enhanced photocatalytic activity under visible light irradiation for the degradation of methyl orange and methylene blue compared with binary ZnO/Ag and ZnO/CdO nanocomposites. The ZnO/Ag/CdO nanocomposite was also used for the degradation of the industrial textile effluent (real sample analysis) and degraded more than 90% in 210 min under visible light irradiation. The small size, high surface area and synergistic effect in the ZnO/Ag/CdO nanocomposite is responsible for high photocatalytic activity. These results also showed that the Ag nanoparticles induced visible light activity and facilitated efficient charge separation in the ZnO/Ag/CdO nanocomposite...
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Alloy nanostructures formed by magnetic and nonmagnetic components play a significant role in sen... more Alloy nanostructures formed by magnetic and nonmagnetic components play a significant role in sensor applications due to their unique magnetic properties. In this study cobalt-silver nanomaterial has been synthesized by chemical reduction using sodium borohydride, though Co and Ag are immiscible according to their phase diagram. The materials prepared with different precursor compositions have been analysed to determine the structure and the magnetic properties. It is observed that the alloy samples show room temperature ferromagnetism. The surface morphology of the as prepared samples was studied from the SEM micrographs. This is a simple but an effective method to prepare magnetic Co-Ag nanomaterials in bulk quantities at room temperature.
Bookmarks Related papers MentionsView impact
The Ni3Mn type of ordering in nanocrystalline NiMn films with different compositions prepared by ... more The Ni3Mn type of ordering in nanocrystalline NiMn films with different compositions prepared by
electrodeposition was investigated by using x-ray diffraction, differential scanning calorimetry
DSC, thermogravimetric analyzer, Mössbauer spectroscopy, and transmission electron
microscopy. The investigations reveal the existence of composition-induced Ni3Mn-type ordering in
the as-deposited film of 76.2 at. % Ni. The atomic disorder is characterized by an exothermic effect
in DSC. An analysis of the broad exothermic transition reveals the stages of phase transformation
leading to ordering. The Curie temperatures of the alloys were determined from thermomagnetic
measurements, the maximum value obtained for the ordered sample. Mössbauer spectroscopy at
room temperature reveals ordered ferromagnetic and disordered paramagnetic phases in the
as-deposited films. Superlattice reflections observed in selected area electron diffraction pattern for
the 76.2 at. % Ni film alone further support the observation of composition-specific atomic
ordering. © 2008 American Institute of Physics. DOI: 10.1063/1.2844211
Bookmarks Related papers MentionsView impact
Polymer-plastics Technology and Engineering, 2012
The preparation and characterization of composite polymer electrolytes (CPE) of Polyindole–Fe2O3–... more The preparation and characterization of composite polymer electrolytes (CPE) of Polyindole–Fe2O3–LiClO4 for different concentrations of indole have been reported. Formation of polyindole –Fe2O3 composite was confirmed by FTIR and XRD. The surface morphology of the composite was studied by SEM. Its microstructure and chemical analyses were performed by transmission electron microscopy and electron energy loss spectroscopy respectively. Ionic conductivity of CPE analyzed by impedance spectroscopy was found to depend on the indole concentration. This type of CPE system can be used as a solid electrolyte in lithium ion polymer batteries.
Bookmarks Related papers MentionsView impact
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