期刊
RADIATION PHYSICS AND CHEMISTRY
卷 79, 期 12, 页码 1203-1208出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.radphyschem.2010.07.009
关键词
Silver nanoparticles; gamma-Irradiation; Particle size; Particle distribution
资金
- Ministry of Higher Education of Malaysia
Colloidal silver nanoparticles were synthesized by gamma-irradiation-induced reduction method of an aqueous solution containing silver nitrate as a precursor in various concentrations between 7.40 x 10(-4) and 1.84 x 10(-3) M, polyvinyl pyrrolidone for capping colloidal nanoparticles, isopropanol as radical scavenger of hydroxyl radicals and deionised water as a solvent. The irradiations were carried out in a Co-60 gamma source chamber at doses up to 70 kGy. The optical absorption spectra were measured using UV-vis spectrophotometer and used to study the particle distribution and electronic structure of silver nanoparticles. As the radiation dose increases from 10 to 70 kGy, the absorption intensity increases with increasing dose. The absorption peak lambda(max) blue shifted from 410 to 403 nm correspond to the increase of absorption conduction electron energy from 3.02 to 3.08 eV, indicating the particle size decreases with increasing dose. The particle size was determined by photon cross correlation spectroscopy and the results showed that the particle diameter decreases exponentially with the increase of dose. The transmission electron microscopy images were taken at doses of 20 and 60 kGy and the results confirmed that as the dose increases the diameter of colloidal silver nanoparticle decreases and the particle distribution increases. (C) 2010 Elsevier Ltd. All rights reserved.
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