期刊
ACS NANO
卷 9, 期 7, 页码 7572-7582出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b02864
关键词
gold nanoparticles; aromatic ligands; thiols; plasmonic properties; charge transfer
类别
资金
- C'Nano Ile de France DIM Nano-K under the project NaJaH
Although gold nanoparticles stabilized by organic thiols are the building blocks in a wide range of applications, the role of the ligands on the plasmon resonance of the metal core has been mostly ignored until now. Herein, a methodology based on the combination of spectroscopic ellipsometry and UV-vis spectroscopy is applied to extract dielectric functions of the different components. It is shown that aromatic thiols allow a significant charge transfer at the hybrid interface with the sand d bands of the gold core that yields giant red shifts of the plasmon band, up to 40 nm for spherical particles in the size range of 3-5 nm. These results suggest that hybrid nanoplasmonic devices may be designed through the suitable choice of metal core and organic components for optimized charge exchange.
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