Compressive surface strained atomic-layer Cu2O on Cu@Ag nanoparticles
| Autor: | Hongpan Rong, Huishan Shang, Wenxing Chen, Qiumei Di, Bing Bai, Jiajia Liu, Meng Xu, Jiatao Zhang, Xiyue Zhu, Xiaobin Zhang, Jia Liu |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Nanoparticle 02 engineering and technology Surface engineering 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Catalysis Nanomaterials chemistry.chemical_compound Aniline Chemical engineering chemistry Azobenzene Transmission electron microscopy General Materials Science Electrical and Electronic Engineering 0210 nano-technology Layer (electronics) |
| Zdroj: | Nano Research. 12:1187-1192 |
| ISSN: | 1998-0000 1998-0124 |
| DOI: | 10.1007/s12274-019-2380-1 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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