Monirsadat Saadat - Department of Physics, Faculty of Basic Sciences, Arak University, I.R. Iran
Gholamreza Nabiyouni - Department of Physics, Faculty of Basic Sciences, Arak University, I.R. Iran
Abolfazl Barati - Department of Chemical Engineering, Faculty of Engineering, Arak University, I.R. Iran

Zinc oxide (ZnO) nanoparticles, a member of Wurtzite family, are one of the most important nanostructures. ZnO has got three advantages Comparing to other oxide. First, it is a semi-conductive substance with a band gap 3.37 eV and the high excitation energy of 60 meV. It also has a emission near the ultraviolet. Second, it is piezoelectric and is frequently used in sensors and reducers. Third, it is biodegradable and non-poisonous. Aggregation is common problem that occurs during the formation of these particles. One of the methods to overcome this problem is to coat the particles by various materials. Polymer coating is an effective way for modifying the particles surface. Polymer adsorption by nanoparticles improves the stability of the suspension against aggregation. In this study, PEG and PVA are used in order to prevent ZnO nanoparticles from aggregation, and also important and effective factors of polymer adsorption such as molecular weight are discussed. The adsorption process is analyzed by IR, the size and the structure of ZnO nanoparticles by XRD, the amount of molar mass of the adsorbed polymer by TGA, and finally, the aggregation and accumulation of the nanoparticles by SEM.

zinc oxide nanoparticles, adsorption, polyethylene glycol, polyvinyl alcohol