STRUCTURAL AND OPTOELECTRONIC PROPERTIES OF ZnS NANOPARTICLES EXPOSED TO ORGANIC AND INORGANIC CAPPING AGENTS

O. Kalu; A. N. Amah; M. A. Mbah

المؤلفون

O. Kalu 1Department of Physics, Material Science Division, Federal University, Lafia, P.M.B. 146 Nasarawa State مؤلف
A. N. Amah Department of Physics, Material Science Section, University of Agriculture, Makurdi, P.M.B. 2737, Benue State مؤلف
M. A. Mbah 3Department of Mathematics, Federal University, Lafia, P.M.B. 146 Nasarawa State مؤلف

الكلمات المفتاحية:

ZnS، Capping agents، Chemical route، Sol-gel، Nanoparticle sizes، Strain and Optoelectronic

الملخص

ZnS nanoparticles capped with Sodium Carboxyl-methyl Cellulose (CMC-organic) and Tetraethylorthosilicate (TEOS-inorganic) as capping agents were synthesized by chemical co-precipitation and sol-gel technique respectively. Structural, morphological and optical studies of the synthesizes nanoparticles were carried out using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), UV-Vis spectroscopy and Fourier transforms infrared spectroscopy (FTIR). Studies of the capped ZnS nanoparticles revealed zinc blende structure.
Particle sizes calculated from Williamson-Hall (W-H) analysis of Uniform Deformation Model (UDM) were (ZnS:CMC) and (ZnS:SiO ). The average strain values calculated from the model indicated that ZnS:SiO has while ZnS:CMC has All samples had smooth surfaces due topassivation of the capping agents. Optical absorption studies shows a blue shift of the absorption edge with band
gap values of and for ZnS:CMC and ZnS:SiO which are higher than the bulk value of ZnS nanoparticles due to quantum confinement effect. The vibrational modes associated with OH-stretching at and the carboxylic group –COOH at confirms the presence of capping agent from the Fourier transform infrared spectroscopy measurement.