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Research Article

Compressive surface strained atomic-layer Cu2O on Cu@Ag nanoparticles

Xiyue Zhu1, Hongpan Rong1(), Xiaobin Zhang2, Qiumei Di1, Huishan Shang1, Bing Bai1, Jiajia Liu1, Jia Liu1, Meng Xu1, Wenxing Chen1, Jiatao Zhang1()
Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications,Experimental Center of Advanced Materials, School of Materials Science & Engineering, Beijing Institute of Technology,Beijing,100081,China;
Center for Nano Materials and Technology,Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi,Ishikawa,923-1292,Japan;
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Abstract

Control of surface structure at the atomic level can effectively tune catalytic properties of nanomaterials. Tuning surface strain is an effective strategy for enhancing catalytic activity; however, the correlation studies between the surface strain with catalytic performance are scant because such mechanistic studies require the precise control of surface strain on catalysts. In this work, a simple strategy of precisely tuning compressive surface strain of atomic-layer Cu2O on Cu@Ag (AL-Cu2O/Cu@Ag) nanoparticles (NPs) is demonstrated. The AL-Cu2O is synthesized by structure evolution of Cu@Ag core-shell nanoparticles, and the precise thickness-control of AL-Cu2O is achieved by tuning the molar ratio of Cu/Ag of the starting material. Aberration-corrected high-resolution transmission electron microscopy (AC-HRTEM) and EELS elemental mapping characterization showed that the compressive surface strain of AL-Cu2O along the [111] and [200] directions can be precisely tuned from 6.5% to 1.6% and 6.6% to 4.7%, respectively, by changing the number of AL-Cu2O layer from 3 to 6. The as-prepared AL-Cu2O/Cu@Ag NPs exhibited excellent catalytic property in the synthesis of azobenzene from aniline, in which the strained 4-layers Cu2O (4.5% along the [111] direction, 6.1% along the [200] direction) exhibits the best catalytic performance. This work may be beneficial for the design and surface engineering of catalysts toward specific applications.

Keywords

compressive surface strainatomic-layer Cu2Oprecise thickness-controlcatalytic activity

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Nano Research
Volume 12 Issue 5,
May 2019
Pages 1187-1192
DOI: 10.1007/s12274-019-2380-1
Cite this article:
Zhu X, Rong H, Zhang X, et al. Compressive surface strained atomic-layer Cu2O on Cu@Ag nanoparticles. Nano Research, 2019, 12(5): 1187-1192. https://doi.org/10.1007/s12274-019-2380-1
Topics:
Copper oxidesCore shell nanoparticlesHigh resolution transmission electron microscopyNanoparticlesSilver compoundsSilver nanoparticlesSurface structureSynthesis (chemical)Thickness control
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