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The ability to controlled introduction of defects, particularly twin defects in Pt-based nanocrystals (NCs) provides a possibility to regulate the performance of Pt-based nanocatalyst. However, because of the high internal strain energy existed in twinned structures, the fabrication of defects in Pt-based NCs is sufficiently challenging. Here we demonstrate a "low-temperature interface-induced assembly" approach that provides precise control over Pt–Cu nanoparticles assembled at the hexadecylamine/water interface, yielding onion-like Pt–Cu NCs exposed a high density of twin defects. Moreover, a bending mechanism is proposed to elucidate the appearance of twin defects and lattice expanding (contraction) based on aberration corrected scanning transmission electron microscopy analysis. This work opens new routes to engineer defects in metalbased alloy NCs, enabling more opportunities in catalysis.

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Publication history

Received: 10 December 2015
Revised: 02 January 2016
Accepted: 03 January 2016
Published: 14 January 2016
Issue date: February 2016

Copyright

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2016

Acknowledgements

Acknowledgements

The authors wish to thank Mr. Chao Yang for valuable advices. This work was supported by the Foundation for the Author of National Excellent Doctoral Dissertation of P. R. China (No. 201321), the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20130002120013), and the National Natural Science Foundation of China (Nos. 21521091, 21131004, 21390393, 21322107, 21325101, 21471089, and U1463202).

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Email: nanores@tup.tsinghua.edu.cn

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