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Title: The surface structure of silver-coated gold nanocrystals and its influence on shape control

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms8664· OSTI ID:1214785
 [1];  [2];  [3];  [1];  [3];  [2];  [1]
  1. Dalhousie Univ. Halifax, Nova Scotia (Canada)
  2. Northwestern Univ., Evanston, IL (United States)
  3. Univ. of California, Riverside, CA (United States)
+ Show Author Affiliations

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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; AC02-06CH11357
OSTI ID:
1214785
Journal Information:
Nature Communications, Vol. 6; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 49 works
Citation information provided by
Web of Science

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Cited By (15)

Optical Properties of Hybrid Organic-Inorganic Materials and their Applications journal August 2016
Atomic-Level-Designed Catalytically Active Palladium Atoms on Ultrathin Gold Nanowires journal December 2016
Engineering Functional Metal Materials at the Atomic Level journal August 2018
Structure-Relaxivity Relationships of Magnetic Nanoparticles for Magnetic Resonance Imaging journal January 2019
Chemically Induced Sintering of Nanoparticles journal August 2019
Chemically Induced Sintering of Nanoparticles journal August 2019
Modulating High-Index Facets on Anatase TiO 2: Modulating High-Index Facets on Anatase TiO 2 journal January 2018
Electroplating of porous gold films for SERS analysis of heme derivatives journal February 2018
Revealing isoelectronic size conversion dynamics of metal nanoclusters by a noncrystallization approach journal May 2018
Peculiar holes on checkerboard facets of a trigonal prismatic Au 9 Ag 36 (SPhCl 2 ) 27 (PPh 3 ) 6 cluster caused by steric hindrance and magic electron count journal January 2017
Nanocluster superstructures or nanoparticles? The self-consuming scaffold decides journal January 2018
Controllable synthesis of Au nanocrystals with systematic shape evolution from an octahedron to a truncated ditetragonal prism and rhombic dodecahedron journal January 2019
The role of trace Ag in the synthesis of Au nanorods journal January 2019
Structural properties of ultra-small thorium and uranium dioxide nanoparticles embedded in a covalent organic framework journal January 2020
Precise control of alloying sites of bimetallic nanoclusters via surface motif exchange reaction journal November 2017

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