Influence of Au(III) Interactions with Chitosan on Gold Nanoparticle Formation

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• 作者：Khoa Dang Nguyen Vo ; Emmanuel Guillon ; Laurent Dupont ; Christelle Kowandy ; Xavier Coqueret
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：February 27, 2014
• 年：2014
• 卷：118
• 期：8
• 页码：4465-4474
• 全文大小：496K
• 年卷期：v.118,no.8(February 27, 2014)
• ISSN：1932-7455

文摘

Potentiometry, electronic spectroscopy, and X-ray absorption (XAS) experiments were carried out to monitor the course of the complexation reaction between AuCl₄^{鈥?/sup> and glucosamine moieties (GLA) of chitosan molecules. The disappearance of the ligand (蟺)鈥搈etal (蟽*) charge transfer (LMCT) band at 313 nm, characteristic of the AuCl₄鈥?/sup> ion, upon the addition of chitosan evidenced the complexation of Au(III) with glucosamine moieties at pH 4. The coordination sphere of Au(III) was determined from the results of XAS experiments in the case of a [GLA]/[Au(III)] ratio equal to 1/4. The Au鈥揅l and Au鈥揙(N) bond lengths were determined. Finally, preliminary results of gold nanoparticle synthesis by Au(III) reduction under electron beam in the presence of chitosan were presented. The influence of gold speciation on the size of preformed Au(0) clusters was evidenced.}