Solvent Influence on the Role of Thiols in Growth of Thiols-Capped Au Nanocrystals
Solvent Influence on the Role of Thiols in Growth of Thiols-Capped Au Nanocrystals
复制标题
溶剂对硫醇在硫醇封端的金纳米晶体生长中的作用的影响
DOI：
10.1021/jp408926n
复制
发表时间：
2014-01-09
影响因子：
3.7
通讯作者：
Wei, Shiqiang
中科院分区：
文献类型：
--
作者：
Jiang, Yong;Huang, Yuanyuan;Wei, Shiqiang
在纳米晶的可控合成中，溶剂起着关键的作用。在这里，我们用X射线吸收光谱证明了溶剂可以显著地影响硫醇在Au NCS上的吸附，从而影响它们的生长。结果表明，溶剂极性越大，纳米颗粒表面的硫醇覆盖率越高。硫醇的高覆盖率抑制了颗粒的生长，结果是，随着溶剂极性的增加，NCS的尺寸变小。溶剂依赖性的根本原因被认为是硫醇的巯基和烷基与溶剂分子之间不同的氢键和疏水相互作用的协同效应。这项工作阐述了溶剂环境在大小可控的NCS合成中的重要作用。
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' sizes decrease with the increase in the solvents' 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.