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Title: Continuous Encodable Reshaping of Gold Nanocrystals through Facet Modulation

Journal Article · · Journal of the American Chemical Society
ORCiD logo [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [2]; ORCiD logo [1];  [3]; ORCiD logo [4]
  1. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  2. Columbia University, New York City, NY (United States)
  3. Columbia University, New York City, NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
  4. Brookhaven National Laboratory (BNL), Upton, NY (United States); Columbia University, New York City, NY (United States); Institute for Basic Science (IBS), Seoul (Korea, Republic of)

Shape control of nanocrystals (NCs) is crucial for tuning their assembly behavior and functional properties, yet the precise manipulation of facet composition remains challenging. Here, we present a nanocrystal reshaping strategy to control and modulate the facets of gold (Au) NCs. Our one-pot approach, conducted at room temperature, requires only initial Au NCs, Au3+ ions, and surfactants, distinguishing it from conventional reduction-mediated “etching-and-regrowth” methods. Detailed structural studies using electron microscopy, small-angle X-ray scattering (SAXS), and UV−vis spectroscopy reveal the surfactant-encoded pathway for NC transformation from shaped particles to spheres and then into various polyhedral shapes while preserving the individual particles' volume. The proposed reshaping mechanism involves the dissolution of surface Au atoms into Au+ complexes in the presence of Au3+ and surfactant, followed by surfactant-guided redeposition and formation of facets with different atomic planes. Using the ethanol oxidation reaction (EOR) as a probe, we observe a quasi-linear decrease in onset potential and an increase in activity with increasing {100} facet exposure. This work broadens synthetic strategies by offering precise NC reshaping and facet control.

Research Organization:
Brookhaven National Lab; Brookhaven National Laboratory; Brookhaven National Laboratory (BNL), Upton, NY (United States); Columbia Univ., New York, NY (United States)
Sponsoring Organization:
Brookhaven National Laboratory; Chemical Sciences, Geosciences, and Biosciences Division; Laboratory Directed Research and Development (LDRD); U.S. Department of Energy (DOE) Office of Science Facilities at Brookhaven National Laboratory; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
SC0009476; SC0012704
OSTI ID:
2574022
Report Number(s):
BNL-228494-2025-JAAM
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 29 Vol. 147; ISSN 0002-7863; ISSN 1520-5126
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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