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Nano Research

Article Title

Interface-induced formation of onion-like alloy nanocrystals by defects engineering

Authors

Wei Jia, Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084, China
Yuen Wu, Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084, China Center of Advanced Nanocatalysis, University of Science and Technology of China (CAN-USTC), Hefei 230026, China
Yifeng Chen, Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084, China
Dongsheng He, Center of Advanced Nanocatalysis, University of Science and Technology of China (CAN-USTC), Hefei 230026, China
Jinpeng Li, Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084, China
Yu Wang, Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084, China
Zhuo Wang, Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084, China
Wei Zhu, Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084, China
Chen Chen, Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084, China
Qing Peng, Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084, China
Dingsheng Wang, Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084, China
Yadong Li, Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084, China

Keywords

alloy nanocrystals, assembly, electroxidation, twin defects, interface

Abstract

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 interfaceinduced 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.

Graphical Abstract

Publisher

Tsinghua University Press

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