期刊
NANO LETTERS
卷 15, 期 6, 页码 4161-4169出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01286
关键词
Localized plasmon resonances; nanocatalysis; surface-enhanced Raman scattering; Au nanorods; low-index facets; high-index facets
类别
资金
- National Science Foundation [DMR-1253231, NSF ECCS-1238738]
- University of South Carolina Office of Vice President for Research through an ASPIRE-I Track-I Award
- Department of Education through GAANN [P200Al20075]
- Office of Naval Research [ONR N00014-0-1-1118]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1253231] Funding Source: National Science Foundation
Au nanorods are optically tunable anisotropic nano-particles with built-in catalytic activities. The state-of-the-art seed-mediated nanorod synthesis offers excellent control over the aspect ratios of cylindrical Au nanorods, which enables fine-tuning of plasmon resonances over a broad spectral range. However, facet control of Au nanorods with atomic-level precision remains significantly more challenging. The coexistence of various types of low-index and high-index facets on the highly curved nanorod surfaces makes it extremely challenging to quantitatively elucidate the atomic-level structure-property relationships that underpin the catalytic competence of Au nanorods: Here we demonstrate that cylindrical Au nanorods undergo controlled facet evolution during their overgrowth in the presence of Cu2+ and cationic surfactants, resulting in the formation of anisotropic nanostructures enclosed by well-defined facets, such as low-index faceting nanocuboids and high-index faceting convex nanocuboids and concave nanocuboids. These faceted Au nanorods exhibit enriched optical extinction spectral features, broader plasmonic tuning range, and enhanced catalytic tunability in comparison to the conventional cylindrical Au nanorods. The capabilities to both fine-tailor the facets and fine-tune the plasmon resonances of anisotropic Au nanoparticles open up unique opportunities for us to study, in great detail; the facet-dependent interfacial molecular transformations on An nanocatalysts using surface-enhanced Raman scattering as a time-resolved spectroscopic tool.
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