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[Ag67(SPhMe2) 32(PPh3) 8]3+:一个大盒形银纳米集群的合成,总结构和光学特性
Mohammad J Alhilaly, Megalamane S Bootharaju, Chakra P Joshi
1Departments of Physics and Chemistry, Nanoscience Center, University of Jyväskylä , FI-40014 Jyväskylä, Finland.
Journal of the American Chemical Society
|October 14, 2016
概括
研究人员使用混合酸盐和素配体合成了一种新的盒形银纳米集群 (Ag67). 这一突破使得金属集群具有独特的形状和特性.
科学领域:
- 材料科学
- 纳米技术
- 无机化学
背景情况:
- 表面连接体工程对于控制纳米粒子中的金属原子安排至关重要.
- 设计具有特定几何形状和特性的金属纳米集团仍然是一个重大挑战.
研究的目的:
- 合成和确定一个大,盒形的银纳米集群 (Ag67).
- 研究混合酸盐和素配体在纳米集群稳定中的作用.
- 探索合成纳米集群的电子结构和光学特性.
主要方法:
- 使用2,4-二甲基乙烯酸和三基联体合成Ag67纳米集群.
- 通过单晶X射线衍射 (SCXRD) 和电喷离子质谱法 (ESI-MS) 确定总结构.
- 使用时间依赖密度函数理论 (TDDFT) 进行电子结构和光学光谱的计算分析.
主要成果:
- 成功合成并阐明具有独特盒形的[Ag67[SPhMe2]32[PPh3]8]3+纳米团的结构.
- 在Ag23金属核心中发现一个前所未有的中心立方体 (Ag13) 核心.
- 确定负责集群稳定性的特定连接物基因 (AgS3P和桥接).
- 在光学光谱中观察高度结构化的多重吸收峰值.
- TDDFT计算将电子结构与光学过渡相关联,类似于盒中的自由电子.
结论:
- 素和醇配体的联合使用促进了具有前所未有的形状的大型复杂金属纳米集群的合成.
- Ag67的独特结构和电子特性为设计先进纳米材料开辟了新的途径.
- 这种方法为创建具有量身定制的几何形状和功能的多种金属集群提供了途径.
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