Journal
NATURE MATERIALS
Volume 15, Issue 8, Pages 889-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT4683
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Funding
- Air Force Office of Scientific Research [FA9550-14-1-0304]
- National Science Foundation [CHE-1308644]
- CCI Center for Nanostructured Electronic Materials [CHE-1038015]
- University of Florida (UF) Howard Hughes Medical Institute (HHMI) Intramural Award
- UF University Scholars Program
- UF's Student Science Training Program
- US Department of Energy (DOE), Office of Basic Energy Sciences [DE-SC0012704]
- DOE Office of Biological and Environmental Research at the Pacific Northwest National Laboratory (PNNL) (Richland, Washington)
- US DOE [DE-AC06-76RLO1930]
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After more than a decade, it is still unknown whether the plasmon-mediated growth of silver nanostructures can be extended to the synthesis of other noble metals, as the molecular mechanisms governing the growth process remain elusive. Herein, we demonstrate the plasmon-driven synthesis of gold nanoprisms and elucidate the details of the photochemical growth mechanism at the single-nanoparticle level. Our investigation reveals that the surfactant polyvinylpyrrolidone preferentially adsorbs along the nanoprism perimeter and serves as a photochemical relay to direct the anisotropic growth of gold nanoprisms. This discovery confers a unique function to polyvinylpyrrolidone that is fundamentally different from its widely accepted role as a crystal-face-blocking ligand. Additionally, we find that nanocrystal twinning exerts a profound influence on the kinetics of this photochemical process by controlling the transport of plasmon-generated hot electrons to polyvinylpyrrolidone. These insights establish a molecular-level description of the underlying mechanisms regulating the plasmon-driven synthesis of gold nanoprisms.
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