Volume 58, Issue 51 pp. 18627-18633
Research Article

In Situ Observation of Dynamic Galvanic Replacement Reactions in Twinned Metallic Nanowires by Liquid Cell Transmission Electron Microscopy

Prof. Dr. Chunqiang Zhuang

Prof. Dr. Chunqiang Zhuang

Institute of Microstructure and Property of Advanced Materials, Beijing Key Lab of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124 China

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Heyang Qi

Heyang Qi

Institute of Microstructure and Property of Advanced Materials, Beijing Key Lab of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124 China

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Xing Cheng

Xing Cheng

Department Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental & Energy Engineering, Beijing University of Technology, 100124 Beijing, P. R. China

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Prof. Dr. Ge Chen

Prof. Dr. Ge Chen

Department Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental & Energy Engineering, Beijing University of Technology, 100124 Beijing, P. R. China

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Chunlang Gao

Chunlang Gao

Institute of Microstructure and Property of Advanced Materials, Beijing Key Lab of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124 China

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Prof. Dr. Lihua Wang

Prof. Dr. Lihua Wang

Institute of Microstructure and Property of Advanced Materials, Beijing Key Lab of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124 China

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Prof. Dr. Shaorui Sun

Corresponding Author

Prof. Dr. Shaorui Sun

Department Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental & Energy Engineering, Beijing University of Technology, 100124 Beijing, P. R. China

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Prof. Dr. Jin Zou

Corresponding Author

Prof. Dr. Jin Zou

Materials Engineering and Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane, QLD, 4072 Australia

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Prof. Dr. Xiaodong Han

Corresponding Author

Prof. Dr. Xiaodong Han

Institute of Microstructure and Property of Advanced Materials, Beijing Key Lab of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124 China

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First published: 17 October 2019
Citations: 56

Graphical Abstract

Under the microscope: Galvanic replacement reactions between Ag nanowires and Au ions in aqueous solution is observed by liquid cell transmission electron microscopy under an electron beam.

Abstract

Galvanic replacement is a versatile approach to prepare hollow nanostructures with controllable morphology and elemental composition. The primary issue is to identify its fundamental mechanism. In this study, in situ liquid cell transmission electron microscopy was employed to monitor the dynamic reaction process and to explore the mechanism of galvanic replacement. The detailed reaction process was revealed based on in situ experiments in which small Au particles first appeared around Ag nanowires; they coalesced, grew, and adhered to Ag nanowires. After that, small pits grew from the edge of Ag nanowires to form tubular structures, and then extended along the Ag nanowires to obtain hollowed structures. All of our experimental observations from the viewpoint of electron microscopy, combined with DFT calculations, contribute towards an in-depth understanding of the galvanic replacement reaction process and the design of new materials with hollow structures.

Conflict of interest

The authors declare no conflict of interest.

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