Журнал нано- та електронної фізики (Journal of nano- and electronic physics)
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Item Environment-Friendly Synthesis of Undoped and Cu doped ZnO Nanoparticles and Study of their Optical Absorption Properties towards Biological Applications(Sumy State University, 2021) Samanta, P.K.; Kamilya, T.Wet chemical method is a simple and cost-effective way to synthesize nanoparticles of high yield and mass production compared to other conventional methods. Besides, it does not require the maintenance of rigorous experimental conditions like high temperature, low pressure or flow of carrier gases. We have followed a simple wet chemical method to synthesize pure and Cu doped ZnO nanoparticles. Absorption spectroscopic study yields the absorption behavior of a material over a wide range of the electromagnetic spectrum. Absorption study of the synthesized undoped ZnO and Cu/ZnO reveals that doping with Cu decreases the absorption coefficient. It clearly indicates that the scattering of photons by phonons reduces due to Cu doping. The Urbach energy is an important parameter to understand the degree of disorder of phonon states in a material. It also enables us to study the dependence of the absorption coefficient on the wavelength of incident photons of energies lower than the band gap energy. For pure ZnO, the Urbach energy was calculated to be 0.511 eV and decreased to 0.483 eV upon doping with Cu in ZnO. The extinction coefficient was also calculated to understand the optical absorption process in the material.Item Sol-gel Synthesis and Structural Properties of Cu Doped ZnO Nanoparticles(Sumy State University, 2019) Samanta, P.K.; Das, M.; Rana, N.K.We report here a sol-gel method to synthesize undoped and Cu doped ZnO nanoparticles. The nanoparticles were characterized using X-ray diffraction technique to understand the crystallographic properties. The results indicate the formation of pure and Cu doped ZnO nanoparticles. The growth was found to be anisotropic. The low concentration of Cu doping does not influence the particles size of ZnO. We have successfully synthesized undoped and Cu doped ZnO nanoparticles using a simple and cost effective sol-gel method. The synthesized nanoparticles exhibit high crystallinity and Cu doping was further confirmed from X-ray diffraction. The diffraction pattern also suggests that the growth of hexagonal ZnO is anisotropic. However due to this low percentage of Cu doping, no significant change in particle size was observed. In this paper, we report a very simple and cost effective sol-gel method to synthesize ZnO nanoparticles followed by typical structural characterization.Item Chemical synthesis and optical properties of ZnO nanoparticles(Sumy State University, 2014) Samanta, P.K.; Saha, A.; Kamilya, T.We report here a simple wet chemical process to synthesize ZnO nanoparticles. The morphology of the nanoparticles was observed in field emission scanning electron microscope. The nanoparticles have average diameter ~ 100 nm. The optical property of the synthesized ZnO nanoparticles was investigated using UVvisible absorption spectra. The synthesized nanoparticles exhibit strong absorption at ~ 279 nm. The band gap of the nanoparticles was calculated from the absorption spectrum and found to be 3.76 eV. Thus the synthesized ZnO nanoparticles will be useful in various optoelectronic applications.Item Interaction of Glucose with ZnO Nanoparticles(Sumy State University, 2014) Samanta, P.K.; Bhunia, A.K.; Kamilya, T.We report the results of the extent of interaction as well as the formation of a bioconjugate of glucose with Zinc Oxide nano particles (ZnO NPs) to understand the non-invasive monitoring of glucose by semiconductor NPs. We performed an array of photophysical as well as microscopic measurements to quantify the interaction between ZnO NPs and glucose. We have found that time constant of interaction (t1) 18.47 min for the binding glucose with surface of ZnO NPs and follows a single exponential association process. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35967