Removal of Molecular Adsorbates on Gold Nanoparticles Using Sodium Borohydride in Water
2013; American Chemical Society; Volume: 13; Issue: 3 Linguagem: Inglês
10.1021/nl304703w
ISSN1530-6992
AutoresSiyam M. Ansar, Fathima S. Ameer, Wenfang Hu, Shengli Zou, Charles U. Pittman, Dongmao Zhang,
Tópico(s)Nanomaterials for catalytic reactions
ResumoThe 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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