The surface structure of silver-coated gold nanocrystals and its influence on shape control.
作者： J. Daniel Padmos , Michelle L. Personick , Qing Tang , Paul N. Duchesne , De-en Jiang
DOI: 10.1038/NCOMMS8664
关键词: Nanocrystal 、 Molecule 、 Nanotechnology 、 Chemical physics 、 Absorption spectroscopy 、 Valence (chemistry) 、 Spectroscopy 、 Adsorption 、 Density functional theory 、 Materials science 、 Anisotropy
摘要: 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 particularly challenging for halide-adsorbed difficulty in analysing interactions between metals light halides (for example, chloride). Here we uncover structures chloride-adsorbed, silver-coated gold {111}, {110}, {310} {720} indexed facets by X-ray absorption spectroscopy density functional theory modelling. The silver–chloride, silver–silver silver–gold bonding are markedly different surfaces, sensitive their formation mechanism type. A unique approach combining experimental/simulated further verifies models identifies previously indistinguishable valence state silver atoms surfaces. Overall, work elucidates thus-far unknown chloride–metal sheds onto halide-induced growth anisotropic nanocrystals.
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