Issue 11, 2013
From the journal:

Nanoscale

In situ atom-resolved tracing of element diffusion in NiAu nanospindles†

Wei Liu,‡a   Kai Sunb  and  Rongming Wang*a  

* Corresponding authors

a Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education), Department of Physics, Beijing University of Aeronautics and Astronautics, Beijing 100191, People's Republic of China
E-mail: rmwang@buaa.edu.cn

b Department of Material Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA

Abstract

The structure evolution behaviors of NiAu nanospindles in oxidizing/vacuum conditions were studied by in situ scanning transmission electron microscopy. The spindle structure transforms into Ni@Au@NiO multi-shell structure in the oxidizing atmosphere following an oxidation-driving multilayer reconstruction mechanism. In the vacuum condition, the NiAu nanospindles evolve along four distinct stages: (i) polyhedron recrystallization of Ni matrix; (ii) facets-selected segregation and recrystallization of Au component; (iii) single crystallization of Ni matrix; (iv) wrapping diffusion of Au component. The investigation here provides a practical insight into the structural stability of NiAu bimetallic catalysts through a thermal processes.

Graphical abstract: In situ atom-resolved tracing of element diffusion in NiAu nanospindles

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Article information

DOI
https://doi.org/10.1039/C3NR00829K
Article type
Paper
Submitted
16 Feb 2013
Accepted
25 Mar 2013
First published
27 Mar 2013

Nanoscale, 2013,5, 5067-5072

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In situ atom-resolved tracing of element diffusion in NiAu nanospindles

W. Liu, K. Sun and R. Wang, Nanoscale, 2013, 5, 5067 DOI: 10.1039/C3NR00829K

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