5408

5068

كارشناسي ارشد

ماده چگال

اصفهان: دانشگاه صنعتي اصفهان، دانشكده فيزيك

1389

[ده]،106ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

پرويز كاملي

هادي سلامتي

14/6/89

جواد هاشمي فر، مهدي رنجبر

فيزيك

ID5068

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Preparation and investigation of structural optical and magnetic properties of ZnO nanoparticles Student name Saideh Zandi Email address s zandi@ph iut ac ir Date of submission 1389 01 18 Department of Physics Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Dr Parviz Kameli Kameli@cc iut ac ir Abstract In this investigation ZnO nanoparticles were prepared by a simple and rapid method This method is based on the short time solid state milling and calcinations of zinc acetate and citric acid powders The samples were characterized using x ray diffraction XRD Transmission Electron Microscope TEM Fourier transform infrared FTIR spectroscopy photoluminescence and UV vis spectroscopy Calculation based on the XRD data shows that the average sizes of ZnO particles are in agreement with TEM images and the size of particles increases by increasing the calcination temperature Also the band gap of samples decreased from 3 29 eV to 3 23 eV by increasing calcination temperature from 350 C to 600 C Photoluminescence analyses shows that many defects such as interstitial zinc zinc vacancy and oxygen vacancy are responsible for the observed optical properties Also effect of Fe doping with various concentrations on the structural optical and magnetic properties of ZnO were investigated Magnetic measurements indicate that Zn1 xFexO x 0 03 0 05 0 075 0 1 samples are ferromagnetic at room temperature Kay words Zinc oxide Semiconductors Diluted magnetic semiconductor Quantum Size effect

پرويز كاملي

هادي سلامتي

جواد هاشمي فر، مهدي رنجبر