期刊
SMALL
卷 17, 期 40, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202103302
关键词
copper; electrocatalysts; methanol oxidation; plasmonics; shape control
类别
资金
- Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT (MSIT) [NRF-2018M3D1A1059001]
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [NRF-2019R1A4A1028700, 2021R1A2C1013604, NRF-2021R1A2C1009303]
- National Research Foundation of Korea [2021R1A2C1013604] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This paper presents the N,N-dimethylformamide (DMF)-assisted shape evolution of highly uniform and shape-pure copper nanocrystals (Cu NCs) for the first time. The shape of Cu NCs can be systematically controlled by adding different amounts of DMF to the reaction mixture in high-temperature conditions while maintaining high size uniformity and shape purity. The origin of shape evolution is understood through first-principles density functional theory calculations, and the shape-dependent plasmonic properties and facet-dependent electrocatalytic activities of the Cu NCs are systematically investigated.
In this paper, the N,N-dimethylformamide (DMF)-assisted shape evolution of highly uniform and shape-pure copper nanocrystals (Cu NCs) is presented for the first time. Colloidal Cu NCs are synthesized via the disproportionation reaction of copper (I) bromide in the presence of a non-polar solvent mixture. It is observed that the shape of Cu NCs is systematically controlled by the addition of different amounts of DMF to the reaction mixture in high-temperature reaction conditions while maintaining a high size uniformity and shape purity. With increasing amount of DMF in the reaction mixture, the morphology of the Cu NCs change from a cube enclosed by six {100} facets, to a sphere with mixed surface facets, and finally, to an octahedron enclosed by eight {111} facets. The origin of this shape evolution is understood via first-principles density functional theory calculations, which allows the study of the change in the relative surface stability according to surface-coordinating adsorbates. Further, the shape-dependent plasmonic properties are systematically investigated with highly uniform and ligand-exchanged colloidal Cu NCs dispersed in acetonitrile. Finally, the facet-dependent electrocatalytic activities of the shape-controlled Cu NCs are investigated to reveal the activities of the highly uniform and shape-pure Cu NCs in the methanol oxidation reaction.
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