Journal
NANO LETTERS
Volume 12, Issue 9, Pages 4647-4650Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl301937j
Keywords
Noble metal nanoparticles; plasmon resonance; colloidal chemistry; nano/microfluidics; gold nanorods; plasmonic heating
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Funding
- European Research Council (ERC)
- Deutsche Forschungsgemeinschft (DFG) through the Nano-systems Initiative Munich (NIM)
- Humboldt Foundation
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Surface-chemistry of individual, optically trapped plasmonic nanoparticles is modified and accelerated by plasmonic overheating. Depending on the optical trapping power, gold nanorods can exhibit red shifts of their plasmon resonance (i.e., increasing aspect ratio) under oxidative conditions. In contrast, in bulk exclusively blue shifts (decreasing aspect ratios) are observed. Supported by calculations, we explain this finding by local temperatures in the trap exceeding the boiling point of the solvent that cannot be achieved in bulk.
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