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

作     者：Wei Jia Yuen Wu Yifeng Chen Dongsheng He Jinpeng Li Yu Wang Zhuo Wang Wei Zhu Chen Chen Qing Peng Dingsheng Wang Yadong Li 

作者机构：Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering Tsinghua UniversityBeijing 100084 China Center of Advanced Nanocatalysis University of Science and Technology of China (CAN-USTC) Hefei 230026 China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2016年第9卷第2期

页      面：584-592页

核心收录：

学科分类：080903[工学-微电子学与固体电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学] 

基　　金：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) 

主　　题：alloy nanocrystals assembly electroxidation twin defects interface 

摘      要：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 metal- based alloy NCs, enabling more opportunities in catalysis.