期刊
NATURE COMMUNICATIONS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms8664
关键词
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资金
- NSERC Canada
- National Science Foundation's MRSEC program at the Materials Research Center of Northwestern University [DMR-1121262]
- NSF
- Department of Defense through the National Defense Science & Engineering Graduate Fellowship Program [32 CFR 168a]
- University of California, Riverside
- Office of Science of the US Department of Energy [DE-AC02-05CH11231]
- NSERC
- CIHR
- University of Saskatchewan
- US Department of Energy-Basic Energy Sciences
- CLS
- University of Washington
- Advanced Photon Source
- US DOE [DE-AC02-06CH11357]
Understanding the surface structure of metal nanocrystals with specific facet indices is important due to its impact on controlling nanocrystal shape and functionality. However, this is particularly challenging for halide-adsorbed nanocrystals due to the difficulty in analysing interactions between metals and light halides (for example, chloride). Here we uncover the surface structures of chloride-adsorbed, silver-coated gold nanocrystals with {111}, {110}, {310} and {720} indexed facets by X-ray absorption spectroscopy and density functional theory modelling. The silver-chloride, silver-silver and silver-gold bonding structures are markedly different between the nanocrystal surfaces, and are sensitive to their formation mechanism and facet type. A unique approach of combining the density functional theory and experimental/simulated X-ray spectroscopy further verifies the surface structure models and identifies the previously indistinguishable valence state of silver atoms on the nanocrystal surfaces. Overall, this work elucidates the thus-far unknown chloride-metal nanocrystal surface structures and sheds light onto the halide-induced growth mechanism of anisotropic nanocrystals.
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