@article{Gautam_Sapkota_Bhujel_Bhattarai_2020, title={Estimation of Particle Size and Band Gap of Zinc Oxide Nanoparticle Synthesized by Chemical Precipitation Method}, volume={41}, url={https://www.nepjol.info/index.php/JNCS/article/view/30448}, DOI={10.3126/jncs.v41i1.30448}, abstractNote={<p>Zinc oxide (ZnO) nanoparticles were synthesized by chemical precipitation method using 0.1M and 0.3M [Zn(NO<sub>3</sub>)<sub>2</sub>.6H<sub>2</sub>O] and Na<sub>2</sub>CO<sub>3 </sub>solutions. The particle size and band gap of ZnO nanoparticles were estimated and effect of concentration on it was investigated. The synthesized nanoparticles were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), Energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR) and UV-visible spectroscopy. The XRD result revealed that synthesized ZnO nanoparticles have pure hexagonal wurtzite structure and the particle size varies from 27.0 nm to 29.9 nm estimated by using Debye-Scherrer’s equation. The TEM image also projected the average particle size in the range of 20-30 nm and selected area electron diffraction (SAED) further verified the formation of hexagonal wurtzite structure. The FTIR result showed a broad absorption band related to Zn-O vibration band. The UV-visible absorption showed a red shift in the absorption edge with increasing concentration of Zn(NO<sub>3</sub>)<sub>2</sub>.6H<sub>2</sub>O solution. The sizes and band gaps of ZnO nanoparticles increased and decreased, respectively with increasing concentration of Zn(NO<sub>3</sub>)<sub>2</sub>.6H<sub>2</sub>O solution from 0.1M to 0.3M.</p>}, number={1}, journal={Journal of Nepal Chemical Society}, author={Gautam, Surendra K. and Sapkota, Bibek and Bhujel, Arun and Bhattarai, Sitaram}, year={2020}, month={Aug.}, pages={46–50} }