7-11 July 2014
Africa/Johannesburg timezone
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Effect of growth temperature on structural and luminescence properties of ZnO nanoparticles by Sol-Gel method

Presented by Mr. Jatani UNGULA on 9 Jul 2014 from 10:20 to 10:40
Type: Oral Presentation
Session: DPCMM1
Track: Track A - Division for Physics of Condensed Matter and Materials

Abstract

ZnO nanoparticles were synthesized by Sol-gel method at different temperatures. The effects of growth temperature on the structure and optical properties of ZnO nanostructures were investigated in detail. Temperature is an important thermodynamic factor that plays a key role in controlling the growth rate of a crystal, the morphology and aspect ratio of ZnO nanostructures. The characterization of the nanoparticles with Scanning Electron Microscopy (SEM) showed that at low temperatures (35 °C and 45ºC) densely packed conglomerates of ZnO nanoparticles were observed. As the growth temperatures increases to 65 °C and 75°C, ZnO nanoparticles, hexagonal in cross-section and with needle-shaped tips were produced. The X-ray Diffraction (XRD) patterns, for samples grown at 35ºC, a peak at 33˚ related to zinc hydroxyl double salts (Zn(OH)2) was observed in addition to peaks related to the wurtzite structure of ZnO [1], indicating that growth at temperatures lower than 40 °C resulted in the formation of both ZnO and Zinc hydroxide . A highly crystalline nanoroparticles were grown at temperatures greater than 45°C. Using UV–Vis absorption measurements the spectra showed the existence of peaks related to ZnO for temperatures as low as 35 °C.

Award

Yes

Level

MSc

Supervisor

Dejene B.F, dejenebf@qwa.ufs.ac.za,UFS(Qwaqwa Campus), Private Bag X13,Phys. dpt Phuthaditjhaba, 9866, South Africa.

Paper

Yes

Place

Room: D Les 201


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