A hybrid electrochemical–thermal method for the preparation of large ZnO nanoparticles |
| |
Authors: | Kodihalli G Chandrappa Thimmappa V Venkatesha Kanagalasara Vathsala and Chikkadasappa Shivakumara |
| |
Institution: | (1) Department of P.G. Studies & Research in Chemistry, School of Chemical Sciences, Kuvempu University, Jnana Sahyadri Campus, Shankaraghatta, 577451 Karnataka, India;(2) Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, 560012, India; |
| |
Abstract: | A simple and efficient two-step hybrid electrochemical–thermal route was developed for the synthesis of large quantity of
ZnO nanoparticles using aqueous sodium bicarbonate electrolyte and sacrificial Zn anode and cathode in an undivided cell under
galvanostatic mode at room temperature. The bath concentration and current density were varied from 30 to 120 mmol and 0.05
to 1.5 A/dm2. The electrochemically generated precursor was calcined for an hour at different range of temperature from 140 to 600 °C.
The calcined samples were characterized by XRD, SEM/EDX, TEM, TG-DTA, FT-IR, and UV–Vis spectral methods. Rietveld refinement
of X-ray data indicates that the calcined compound exhibits hexagonal (Wurtzite) structure with space group of P63mc (No. 186). The crystallite sizes were in the range of 22–75 nm based on Debye–Scherrer equation. The TEM results reveal that
the particle sizes were in the order of 30–40 nm. The blue shift was noticed in UV–Vis absorption spectra, the band gaps were
found to be 5.40–5.11 eV. Scanning electron micrographs suggest that all the samples were randomly oriented granular morphology. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|