New Insight into Intermediate Precursors of Brust鈥揝chiffrin Gold Nanoparticles Synthesis

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• 作者：Lili Zhu ; Chen Zhang ; Chengchen Guo ; Xiaoliang Wang ; Pingchuan Sun ; Dongshan Zhou ; Wei Chen ; Gi Xue
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：May 30, 2013
• 年：2013
• 卷：117
• 期：21
• 页码：11399-11404
• 全文大小：303K
• 年卷期：v.117,no.21(May 30, 2013)
• ISSN：1932-7455

文摘

There is an ongoing intensive debate on the mechanism of gold nanoparticles formation regarding the intermediate precursors prior to the addition of reducing agent. A new detailed view of the widely used Brust鈥揝chiffrin two-phase method to prepare gold nanoparticles is presented here. Precursor species of these reactions have been identified and quantified by NMR, UV鈥搗isible, Fourier-transform Raman spectroscopy, etc. We demonstrate that tetraalkylammonium gold complexes ([TOA][AuX₂]) and soluble gold thiolate ([TOA][AuSRX] and [TOA][Au(SR)₂]) were detectable as the precursors by NMR spectroscopy. Their relative contents depend on the concentration of reactants. Higher concentration of the reactants is favorable for the formation of soluble thiolate. Polymeric gold thiolate [Au(I)SR]_n could eventually precipitate from the solution under specific conditions. The clear mechanism presented here is of great significance to tailor the size and properties of the final products.