Parthasarathy Srinivasan | SASTRA University (original) (raw)
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The nanostructured ZnO thin films were deposited using spray pyrolysis technique. Formation of po... more The nanostructured ZnO thin films were deposited using spray pyrolysis technique. Formation of
polycrystalinity with hexagonal wurtzite structure was observed from the structural study. Highly dense
spherical shaped nanoparticles with fine crystallites were observed from the surface morphological
studies. The light induced hydrogen peroxide vapour sensing was done using chemi-resistive method
and its effect on the sensing response was studied and reported.
Undoped and different molar concentrations of Mg-doped ZnO thin films were deposited on glass sub... more Undoped and different molar concentrations of Mg-doped ZnO thin films were deposited on glass substrates via. spray pyrolysis process. Doping concentration was varied from 0.002 to 0.01 M in steps of 0.002 M. Structural, morphological, optical, electrical and room temperature gas sensing characteristics of undoped and Mg-doped ZnO thin films were investigated using X-Ray Diffractometer (XRD), Field Emission Scanning Electron Microscope (FE-SEM), UVeVis Spectrophotometer and an electrometer respectively. Structural analysis revealed that all the films were polycrystalline in nature with hexagonal wurtzite crystal structure. Spherical shaped uniformly distributed grains were observed for all the films with slight change in size. The optical absorption edge shifted towards the lower wavelength with an increase in Mg-dopant concentration confirmed the blue-shift. Films with lower Mg-dopant concentration showed maximum response towards ammonia at room temperature with quick response and recovery times.
ZnO thin film was deposited on to the preheated glass substrates by spray pyrolysis technique. Th... more ZnO thin film was deposited on to the preheated glass substrates by spray pyrolysis technique. The polycrystalinity and the hexagonal structures were observed from the X-ray diffraction pattern and the variation in lattice constant was also being reported. The average crystallite size was found to be 30 nm to 35 nm. The morphological studies confirmed the formation of ZnO nanorods. From optical studies, the band gap was found to be ~3.32 eV. The room temperature vapour response was studied for different volatile vapours by chemiresistor method. It was observed that the film had a good response towards ethanol vapour under the exposure of light. The sensing mechanism, sensitivity and response-recovery profile as a function of ethanol concentration were studied and reported.
The nanostructured ZnO thin films were deposited using spray pyrolysis technique. Formation of po... more The nanostructured ZnO thin films were deposited using spray pyrolysis technique. Formation of
polycrystalinity with hexagonal wurtzite structure was observed from the structural study. Highly dense
spherical shaped nanoparticles with fine crystallites were observed from the surface morphological
studies. The light induced hydrogen peroxide vapour sensing was done using chemi-resistive method
and its effect on the sensing response was studied and reported.
Undoped and different molar concentrations of Mg-doped ZnO thin films were deposited on glass sub... more Undoped and different molar concentrations of Mg-doped ZnO thin films were deposited on glass substrates via. spray pyrolysis process. Doping concentration was varied from 0.002 to 0.01 M in steps of 0.002 M. Structural, morphological, optical, electrical and room temperature gas sensing characteristics of undoped and Mg-doped ZnO thin films were investigated using X-Ray Diffractometer (XRD), Field Emission Scanning Electron Microscope (FE-SEM), UVeVis Spectrophotometer and an electrometer respectively. Structural analysis revealed that all the films were polycrystalline in nature with hexagonal wurtzite crystal structure. Spherical shaped uniformly distributed grains were observed for all the films with slight change in size. The optical absorption edge shifted towards the lower wavelength with an increase in Mg-dopant concentration confirmed the blue-shift. Films with lower Mg-dopant concentration showed maximum response towards ammonia at room temperature with quick response and recovery times.
ZnO thin film was deposited on to the preheated glass substrates by spray pyrolysis technique. Th... more ZnO thin film was deposited on to the preheated glass substrates by spray pyrolysis technique. The polycrystalinity and the hexagonal structures were observed from the X-ray diffraction pattern and the variation in lattice constant was also being reported. The average crystallite size was found to be 30 nm to 35 nm. The morphological studies confirmed the formation of ZnO nanorods. From optical studies, the band gap was found to be ~3.32 eV. The room temperature vapour response was studied for different volatile vapours by chemiresistor method. It was observed that the film had a good response towards ethanol vapour under the exposure of light. The sensing mechanism, sensitivity and response-recovery profile as a function of ethanol concentration were studied and reported.