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使用环境扫描传输电子显微镜可视化纳米颗粒中的Cu/Cu2O接口过渡

Alec P LaGrow¹, Michael R Ward¹, David C Lloyd¹

¹The York Nanocentre and Departments of ‡Physics, ∥Chemistry, and §Electronics, University of York , York YO10 5DD, U.K.

Journal of the American Chemical Society

|December 13, 2016

概括

研究人员使用环境扫描传输电子显微镜研究了铜纳米粒子氧化还原机制. 他们观察到单向氧化和还原,揭示了对纳米催化剂控制至关重要的晶体关系.

科学领域:

纳米催化
材料科学
表面化学

背景情况:

了解过渡金属纳米粒子的氧化还原机制是优化催化应用的关键.
在反应过程中,纳米粒子可以在现场改变氧化状态,因此需要动态观察.

研究的目的:

研究铜纳米颗粒的动态氧化和还原机制.
在铜纳米催化过程中阐明晶体关系.

主要方法:

使用高分辨率环境扫描传输电子显微镜 (ESTEM) 进行现场观测.
使用高角度环状暗场成像来追踪氧化面和原子数对比度变化.
在不同温度和氧气/压力下研究铜纳米颗粒的动态氧化和随后的减少.

主要成果:

在铜纳米颗粒中观察到氧化前线的单向进展.
在Cu-to-Cu2O接口上确定了一个特定的晶体关系 (Cu{111}//Cu2O{111}).
发现还原过程反映了氧化,保持了相似的晶体关系.

结论:

在现场动态的ESTEM观测提供了对铜纳米粒子氧化还原机制的关键见解.
单向进展和晶体关系对于控制催化中的纳米粒子行为至关重要.
这些发现对于理解和设计基于铜的纳米催化剂至关重要.

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相关概念视频

Scanning Electron Microscopy

Scanning Electron Microscopy

A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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