Title :
Microwave pulse-assisted wet chemical synthesis of ZnO nanoparticles with excellent UV emission
Author :
Oudhia, A. ; Choudhary, A.
Author_Institution :
Gov. V.Y.T. PG. Autonomous Coll., Durg, India
Abstract :
ZnO nanoparticles (ZNPs) were synthesized by wet chemical method using poly vinyl alcohol (PVA) templates. Uniform growth, high yield and excellent optical properties were observed in ZNPs synthesized under pulsed microwave irradiation (PMW). Moreover the dangling bonds of ZNPs prepared under PMW were passivated more effectively than in samples prepared without it. Strong UV emission peaks at ~ 360 nm and 380 nm, along with a feeble defect-related visible emission peak at ~ 465 nm, were observed in the room temperature (RT) photoluminescence (PL) spectra of ZNPs. Observation of two distinct excitonic peaks in RT UV-vis optical absorbance spectra and high UV-to-visible PL intensity ratio show high quality of ZNPs prepared by the present method. FTIR spectra were employed to explain the surface passivation mechanism of PVA.
Keywords :
Fourier transform infrared spectra; II-VI semiconductors; excitons; nanofabrication; nanoparticles; passivation; photoluminescence; radiation effects; semiconductor growth; ultraviolet spectra; visible spectra; wide band gap semiconductors; zinc compounds; FTIR spectra; PVA templates; UV emission; UV-to-visible photoluminescence intensity ratio; UV-vis optical absorbance spectra; ZnO; dangling bonds; excitonic peaks; microwave pulse-assisted wet chemical synthesis; nanoparticles; optical properties; photoluminescence spectra; polyvinyl alcohol templates; pulsed microwave irradiation; surface passivation mechanism; temperature 293 K to 298 K; II-VI semiconductor materials; Microwave theory and techniques; Nanoparticles; Radiation effects; Stimulated emission; Zinc oxide; Excitonic emission; Microwave assisted method; UV emission; Wet Chemical Method; ZnO nanoparticles;
Conference_Titel :
Emerging Electronics (ICEE), 2014 IEEE 2nd International Conference on
Print_ISBN :
978-1-4673-6527-7
DOI :
10.1109/ICEmElec.2014.7151181
