X-RAY DIFFRACTION ANALYSIS OF GREEN SYNTHESIZED ZINC OXIDE NANOCRYSTALLITES USING WAVELET DENOISING
Ravikant Divakar
Department of Physics, Hindu College, Moradabad, U.P. (INDIA)
Anil Kumar
Department of Physics, Hindu College, Moradabad, U.P. (INDIA)
Email: akumarmbd@gmail.com
Abstract
The zinc oxide (ZnO) nanocrystallites are synthesized from zinc nitrate hexahydrate by a sol-gel combustion process using aloe-vera gel. As prepared ZnO nanocrystallites are characterized using X-ray diffraction (XRD). In wavelet analysis, a suitable wavelet is selected for a given signal and its wavelet coefficients are determined. Thresholding of wavelet coefficients is performed to zero out small magnitude coefficients and retain the large magnitude coefficients. X-ray diffractogram is denoised through discrete wavelet transform’s soft Thresholding. In denoised signals clear and sharp peaks are observed. X-ray diffraction study confirms the crystalline nature of ZnO nanocrystallites. The diffraction peaks become sharper with increasing calcination temperature indicating the enhancement of crystallinity.
Keywords:
Zinc oxide, nanocrystallite, green synthesis, XRD, wavelet transform, denoising
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