期刊
NANO LETTERS
卷 15, 期 1, 页码 542-548出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl503960s
关键词
Localized surface plasmon resonance; ligand exchange; single-particle spectroscopy; discrete dipole approximation; nanoplate
类别
资金
- National Science Foundation [CHE-1308763, OCI-1053575]
- National Science Foundation through the NanoBIO Node to the Network for Computational Nanotechnology (NCN) [EEC 1227034]
- Sloan Research Fellowship
- NanoBIO Node at UIUC
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1308763] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Engineering Education and Centers [1227034] Funding Source: National Science Foundation
In analogy with benzene-derived molecular structures, we construct plasmonic metamolecules by attaching Au nanospheres to specific sites on a hexagonal Au nanoplate. We employ a ligand exchange strategy that allows regioselective control of nanosphere attachment and study resulting structures using correlated electron microscopy/optical spectroscopy at the single-metamolecule level. We find that plasmonic coupling within the resulting assembly is strongly dependent on the structure of the metamolecule, in particular the site of attachment of the nanosphere(s). We also uncover a synergy in the polarizing effect of multiple nanospheres attached to the nanoplate. Regioselective control of plasmonic properties demonstrated here enables the design of novel structure-dependent electromagnetic modes and applications in three-dimensional spatial nanosensors.
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