Zinc Oxide (ZnO) is a technological and promising material due to its unique physical and chemical properties. It is a II-VI semiconductor with wide band gap of 3.3 eV. It has potential applications in many areas such as optoelectronic devices, solar cells, chemical sensors, piezoelectric devices, spintronics etc. In the present work, ZnO nanoparticles with varying concentration of capping agent were prepared using chemical precipitation method. These particles were characterized using UV-Vis spectroscopy and absorption spectra have been obtained to determine the band gap. The obtained band gap values were in the range 3.405-3.433 eV. It was observed that particle size decreases with increasing capping agent concentration and the absorption edge shifts towards blue region as the capping agent concentration is increased. The effective band gap Eg increases with decreasing the particle size. This response is equivalent to size quantization effect owing to the small size of the particles. Using the effective mass approximation formula, the particle size of nanoparticles has been estimated.
ZnO nanoparticle, UV-Vis Spectroscopy, Capping agent, Band Gap, Particle Size.
Juhi Soni; A. A. Koser, Synthesis of ZnO Nanoparticle using Different Concentration of Capping Agent, HCTL Open International Journal of Technology Innovations and Research (IJTIR), Volume 16, July 2015, e-ISSN: 2321-1814, ISBN: 978-1-943730-43-8.