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Investigations on ZnS nanoparticles based on synthesis temperature for optoelectronic device applications

D. AMARANATHA REDDY1, G. MURALI1, A. DIVYA1, R.P. VIJAYALAKSHMI1,* , B.K. REDDY1

Affiliation

  1. Department of Physics, Sri Venkateswara University, Tirupati-517502, India.

Abstract

ZnS nanoparticles were synthesized by chemical co-precipitation method at 273K (ice temperature) and 373K (100o C) from homogenous solutions of zinc acetate and sodium sulfide. Two sets of ZnS nanoparticles were obtained one, using thiophenol as capping agent and the other, with no capping agent and the results were compared. Morphological studies were carried out using Scanning Electron Microscopy (SEM). X-ray diffraction (XRD) studies revealed the phase singularity of ZnS particles with zincblende structure with the lattice parameter in the range of 5.2-5.5 Å. The mean crystallite sizes were in the range of 1.4nm-6nm.Samples prepared in the absence of template at lower preparation temperature had lower grain size. Atomic Force Microscopy (AFM) studies confirmed the particle size is in the same range. The estimated values of average strain and dislocation density indicated that the particles formed at lower temperature were less strained. Optical absorption studies indicated blue shift of the absorption edge with band gap values in the range of 4.2-4.4eV which are higher than the bulk value of 3.6eV, depicting the nano size of the present ZnS particles..

Keywords

ZnS nanoparticles, Low temperature, Chemical synthesis, X-ray diffraction, AFM, Blue shift.

Submitted at: Oct. 15, 2010
Accepted at: Nov. 19, 2010

Citation

D. AMARANATHA REDDY, G. MURALI, A. DIVYA, R.P. VIJAYALAKSHMI, B.K. REDDY, Investigations on ZnS nanoparticles based on synthesis temperature for optoelectronic device applications, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 11, pp. 2185-2189 (2010)