Journal
NANO LETTERS
Volume 13, Issue 3, Pages 1226-1229Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl304703w
Keywords
Organothiols; hydride; gold nanoparticles; desorption; sodium borohydride
Categories
Funding
- NSF CAREER [CHE 1151057]
- NSF [EPS-0903787]
- ONR
- ACS/PRF
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1151057] Funding Source: National Science Foundation
- EPSCoR
- Office Of The Director [1006983, 903787] Funding Source: National Science Foundation
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The mechanism of sodium borohydride removal of organothiols from gold nanoparticles (AuNPs) was studied using an experimental investigation and computational modeling. Organothiols and other AuNP surface adsorbates such as thiophene, adenine, rhodamine, small anions (Br- and I-), and a polymer (PVP, poly(N-vinylpyrrolidone)) can all be rapidly and completely removed from the AuNP surfaces. A computational study showed that hydride derived from sodium borohydride has a higher binding affinity to AuNPs than organothiols. Thus, it can displace organothiols and all the other adsorbates tested from AuNPs. Sodium borohydride may be used as a hazard-free, general-purpose detergent that should find utility in a variety of AuNP applications including catalysis, biosensing, surface enhanced Raman spectroscopy, and AuNP recycle and reuse.
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