Solvent Influence on the Role of Thiols in Growth of Thiols-Capped Au Nanocrystals

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• 作者：Yong Jiang ; Yuanyuan Huang ; Hao Cheng ; Qinghua Liu ; Zhi Xie ; Tao Yao ; Zheng Jiang ; Yuying Huang ; Qing Bian ; Guoqiang Pan ; Zhihu Sun ; Shiqiang Wei
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：January 9, 2014
• 年：2014
• 卷：118
• 期：1
• 页码：714-719
• 全文大小：358K
• ISSN：1932-7455

文摘

Solvent has a key role in the controllable synthesis of nanocrystals (NCs). Here, using X-ray absorption spectroscopy, we demonstrate that solvent can significantly influence the adsorption of thiols on Au NCs, and thereby affects their growth. It is shown that increasing the solvent polarities leads to the higher thiol coverage on the NC surface. The high coverage of thiols then retards the growth of particles, and as a result, the NCs鈥?sizes decrease with the increase in the solvents鈥?polarities. The underlying reason for the solvent dependence is proposed to be the synergistic effects of different hydrogen bond and hydrophobic interactions between the sulfhydryl and alkyl groups of thiols with the solvents molecules. This work addresses the important role of the solvent environments in the size-controlled synthesis of NCs.