R. krishna sharma | University of North Carolina at Greensboro (original) (raw)

R. krishna sharma

Address: Greensboro, North Carolina, United States

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Papers by R. krishna sharma

Research paper thumbnail of High yield synthesis and characterization of aqueous stable zinc oxide nanocrystals using various precursors

Research paper thumbnail of Rare-earth free yellow-green emitting NaZnPO4:Mn phosphor for lighting applications

Applied Physics Letters, 2012

Research paper thumbnail of High yield synthesis and characterization of aqueous stable zinc oxide nanocrystals using various precursors

Journal of Alloys and Compounds, 2013

We report a high ($94%) yield synthesis of intrinsic zinc oxide (ZnO) nanocrystal powders having ... more We report a high ($94%) yield synthesis of intrinsic zinc oxide (ZnO) nanocrystal powders having crystallite sizes in the range 13-35 nm using a novel gel-incineration method with inexpensive precursor salts and citric acid as chelating agent. The influence of various precursor chemicals on the nanocrystallite size, morphology and luminescent properties has been studied in detail. It was identified that the ZnO nanocrystals prepared using organic precursor resulted the smallest crystallite size as compared to inorganic precursors. Reaction temperature was optimized to be $900°C by simultaneous thermogravimetric analysis and differential scanning calorimetry studies. Morphology and microstructure of the ZnO nanocrystals have been studied using a scanning electron microscopy. Analysis of photoluminescence excitation and emission spectra enabled us to calculate the band gap energy and defect analysis of as prepared ZnO nanocrystals respectively. The stability of ZnO nanocrystals in water has been verified on time scale and its potential use has been successfully demonstrated for security marker applications.

Research paper thumbnail of Rare-earth free yellow-green emitting NaZnPO4:Mn phosphor for lighting applications

Research paper thumbnail of High yield synthesis and characterization of aqueous stable zinc oxide nanocrystals using various precursors

We report a high ($94%) yield synthesis of intrinsic zinc oxide (ZnO) nanocrystal powders having ... more We report a high ($94%) yield synthesis of intrinsic zinc oxide (ZnO) nanocrystal powders having crystallite sizes in the range 13-35 nm using a novel gel-incineration method with inexpensive precursor salts and citric acid as chelating agent. The influence of various precursor chemicals on the nanocrystallite size, morphology and luminescent properties has been studied in detail. It was identified that the ZnO nanocrystals prepared using organic precursor resulted the smallest crystallite size as compared to inorganic precursors. Reaction temperature was optimized to be $900°C by simultaneous thermogravimetric analysis and differential scanning calorimetry studies. Morphology and microstructure of the ZnO nanocrystals have been studied using a scanning electron microscopy. Analysis of photoluminescence excitation and emission spectra enabled us to calculate the band gap energy and defect analysis of as prepared ZnO nanocrystals respectively. The stability of ZnO nanocrystals in water has been verified on time scale and its potential use has been successfully demonstrated for security marker applications.

Research paper thumbnail of High yield synthesis and characterization of aqueous stable zinc oxide nanocrystals using various precursors

Research paper thumbnail of Rare-earth free yellow-green emitting NaZnPO4:Mn phosphor for lighting applications

Applied Physics Letters, 2012

Research paper thumbnail of High yield synthesis and characterization of aqueous stable zinc oxide nanocrystals using various precursors

Journal of Alloys and Compounds, 2013

We report a high ($94%) yield synthesis of intrinsic zinc oxide (ZnO) nanocrystal powders having ... more We report a high ($94%) yield synthesis of intrinsic zinc oxide (ZnO) nanocrystal powders having crystallite sizes in the range 13-35 nm using a novel gel-incineration method with inexpensive precursor salts and citric acid as chelating agent. The influence of various precursor chemicals on the nanocrystallite size, morphology and luminescent properties has been studied in detail. It was identified that the ZnO nanocrystals prepared using organic precursor resulted the smallest crystallite size as compared to inorganic precursors. Reaction temperature was optimized to be $900°C by simultaneous thermogravimetric analysis and differential scanning calorimetry studies. Morphology and microstructure of the ZnO nanocrystals have been studied using a scanning electron microscopy. Analysis of photoluminescence excitation and emission spectra enabled us to calculate the band gap energy and defect analysis of as prepared ZnO nanocrystals respectively. The stability of ZnO nanocrystals in water has been verified on time scale and its potential use has been successfully demonstrated for security marker applications.

Research paper thumbnail of Rare-earth free yellow-green emitting NaZnPO4:Mn phosphor for lighting applications

Research paper thumbnail of High yield synthesis and characterization of aqueous stable zinc oxide nanocrystals using various precursors

We report a high ($94%) yield synthesis of intrinsic zinc oxide (ZnO) nanocrystal powders having ... more We report a high ($94%) yield synthesis of intrinsic zinc oxide (ZnO) nanocrystal powders having crystallite sizes in the range 13-35 nm using a novel gel-incineration method with inexpensive precursor salts and citric acid as chelating agent. The influence of various precursor chemicals on the nanocrystallite size, morphology and luminescent properties has been studied in detail. It was identified that the ZnO nanocrystals prepared using organic precursor resulted the smallest crystallite size as compared to inorganic precursors. Reaction temperature was optimized to be $900°C by simultaneous thermogravimetric analysis and differential scanning calorimetry studies. Morphology and microstructure of the ZnO nanocrystals have been studied using a scanning electron microscopy. Analysis of photoluminescence excitation and emission spectra enabled us to calculate the band gap energy and defect analysis of as prepared ZnO nanocrystals respectively. The stability of ZnO nanocrystals in water has been verified on time scale and its potential use has been successfully demonstrated for security marker applications.

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