通过现场光电化学探测的合性等离子铜硫化物纳米晶体中的铜合电子转移
Kimberly H Hartstein1, Carl K Brozek1, Stijn O M Hinterding1
1Department of Chemistry , University of Washington , Seattle , Washington 98195-1700 , United States.
Journal of the American Chemical Society
|February 21, 2018
概括
铜硫化物纳米晶体通过受控注表现出可调节的局部表面等离子共振 (LSPR). 光谱电化学研究显示,阴离子空位是稳定电荷载体的关键,可用于高级等离子体应用的可逆LSPR切换.
科学领域:
- 材料科学
- 纳米技术
- 物理化学
背景情况:
- 硫化铜纳米晶体支持非局部化孔,使局部化表面等离子共振 (LSPR) 能够用于红外应用.
- 控制纳米晶体的形状,组成和电荷载体对于调整等离子体特性至关重要.
- 对于技术进步至关重要的是理解从内在半导体转化为杂半导体的化学变化.
研究的目的:
- 在氧化还原反应期间量化探测铜硫化物纳米晶体中的费米级能量 (EF).
- 阐明控制LSPR切换的微观化学过程.
- 为半导体纳米结构中的等离子生成提供基本的热力学见解.
主要方法:
- 使用光谱电化学电位计作为现场探测器.
- 研究氧化还原反应以控制LSPR带的存在和位置.
- 分析晶体结构和电荷载体稳定机制.
主要成果:
- 在含有或不含有阴离子空位的硫化铜纳米晶体中证明了光谱无法区分的LSPR波段.
- 在稳定多余的自由载体方面,确定了比表面离子更有效的离子空缺.
- 在氧化和还原过程中观察到可逆的LSPR带外观,EF转移和晶体结构变化.
结论:
- 铜硫化物纳米晶体中的LSPR切换是可逆的,并且与阴离子空位形成和费米水平转移有关.
- 阴离子空缺在稳定自由载体和使可调的等离子体起到至关重要的作用.
- 该研究提供了用于设计可逆等离子生成系统的定量热力学数据.
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