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

Xiyue Zhu, Hongpan Rong, Xiaobin Zhang, Qiumei Di, Huishan Shang, Bing Bai, Jiajia Liu, Jia Liu, Meng Xu, Wenxing Chen, Jiatao Zhang

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

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.[Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)1187-1192
Number of pages6
JournalNano Research
Volume12
Issue number5
DOIs
Publication statusPublished - 2019 May 1
Externally publishedYes

Keywords

  • atomic-layer CuO
  • catalytic activity
  • compressive surface strain
  • precise thickness-control

ASJC Scopus subject areas

  • Materials Science(all)
  • Electrical and Electronic Engineering

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