International Journal of Molecular Sciences | |
Influence of Dose on Particle Size and Optical Properties of Colloidal Platinum Nanoparticles | |
Elham Gharibshahi1  | |
[1]Department of Physics, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia | |
[2] E-Mail | |
关键词: nanoscience; metal nanoparticle theory; conduction electrons; conduction bands; platinum nanoparticles; radiolytic method; quantum mechanical calculation; | |
DOI : 10.3390/ijms131114723 | |
来源: mdpi | |
【 摘 要 】
Attempts to produce colloidal platinum nanoparticles by using steady absorption spectra with various chemical-based reduction methods often resulted in the fast disappearance of the absorption maxima leaving reduced platinum nanoparticles with little information on their optical properties. We synthesized colloidal platinum nanoparticles in an aqueous solution of polyvinyl pyrrolidone by gamma radiolytic reduction method, which produced steady absorption spectra of fully reduced and highly pure platinum nanoparticles free from by-product impurities or reducing agent contamination. The average particle size was found to be in the range of 3.4–5.3 nm and decreased with increasing dose due to the domination of nucleation over ion association in the formation of metal nanoparticles by the gamma radiolytic reduction method. The platinum nanoparticles exhibit optical absorption spectra with two absorption peaks centered at about 216 and 264 nm and the peaks blue shifted to lower wavelengths with decreasing particle size. The absorption spectra of platinum nanoparticles were also calculated using quantum mechanical treatment and coincidently a good agreement was obtained between the calculated and measured absorption peaks at various particle sizes. This indicates that the 216 and 264-nm absorption peaks of platinum nanoparticles conceivably originated from the intra-band transitions of conduction electrons of (
【 授权许可】
CC BY
© 2012 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.
【 预 览 】
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RO202003190040316ZK.pdf | 718KB | download |