[Ag62S12(SBu(t))32](2+) 纳米团的晶体结构和光学特性,具有完整的面中心立方核
Shan Jin1, Shuxin Wang, Yongbo Song
1Department of Chemistry and Center for Atomic Engineering of Advanced Materials, Anhui University , Hefei, Anhui 230601, People's Republic of China.
Journal of the American Chemical Society
|October 25, 2014
概括
确定了银纳米集群 (NC-I) 的晶体结构,与类似的纳米集群 (NC-II) 相比,揭示了独特的光学特性. 在NC-I中,自由价值电子通过改变电荷转移过程来灭光发光.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 无机化学 无机化学 有机化学
背景情况:
- 银纳米集群是具有调节性质的有希望的材料.
- 了解结构属性关系对于开发新的基于银的纳米材料至关重要.
- 之前的研究已经描述了类似的硫化银纳米集群.
研究的目的:
- 为了确定[Ag62S12(SBu(t))32](2+) 纳米集群 (NC-I) 的晶体结构.
- 为了研究NC-I与[Ag62S13(SBu(t)) [32](4+) (NC-II) 相比,NC-I的独特光学特性.
- 阐明对观察到的属性差异负责的潜在机制.
主要方法:
- 用X射线结晶学来确定晶体结构.
- 五秒短暂吸收光谱用于研究兴奋状态动态.
- 时间依赖密度函数理论 (TDDFT) 对电子结构和光学光谱的计算.
主要成果:
- 解决了NC-I的晶体结构,具有Ag14核心和Ag48(SBu(t)) 32外.
- 在NC-I和NC-II之间观察到光学性质的显著差异.
- 在NC-I中,自由价值电子被确定为通过改变的联体到金属电荷转移 (LMCT) 来灭光发光的原因.
结论:
- 该研究提供了NC-I银纳米集群的详细结构和光学特征.
- 它揭示了自由价值电子在调节银纳米集群的光发光和电子特性中的关键作用.
- 这些发现有助于更深入地了解银集群材料中的结构性质演变.
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