核调和对双金属纳米集群的光学和电化学差距的不均影响
Lizhong He1,2, Jinyun Yuan3, Nan Xia1
1Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, CAS Center for Excellence in Nanoscience, Institute of Solid State Physics , Chinese Academy of Sciences , Hefei 230031 , P. R. China.
Journal of the American Chemical Society
|February 23, 2018
概括
研究人员通过向核心添加银原子精确修改金属纳米集群. 这种微调影响了电子结构和电化学特性,为纳米粒子的行为和应用提供了新的见解.
科学领域:
- 纳米技术
- 材料科学
- 物理化学
背景情况:
- 对金属纳米集群的精确原子级改造对于调整属性和理解结构属性关系至关重要.
- 虽然已知金属纳米集中的化和减少保护原子,但精确的核原子操纵仍然是一个挑战.
研究的目的:
- 开发一种用于精确调节金属纳米集群的新策略.
- 研究核心修改对纳米集群光学和电化学性能的影响.
主要方法:
- 使用带有硬质障碍的配体合成一种新型双金属纳米集群.
- 使用单晶X射线晶体学进行表征.
- 对光学吸收和电化学特性进行分析.
- 使用自然人口分析进行计算分析.
主要成果:
- 一个具有Ag2Pt@Ag12核的新型纳米团被合成,通过X射线结晶学证实.
- 新的纳米集群显示了相似的光学吸收,但与母Ag24Pt(SR) 18纳米集群相比,具有不同的电化学差距.
- 自然种群分析表明,核调节影响了电荷分布,但没有从根本上改变电子结构.
结论:
- 通过修改内核来精确调整金属纳米集群的新方法已经建立.
- 核的修改可以显著改变电化学性质,即使光学性质变化很小.
- 这些发现为纳米粒子的结构-性质相关性提供了关键的见解,为特定应用提供了指导.
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