Charge Transfer at Hybrid Interfaces: Plasmonics of Aromatic Thiol-Capped Gold Nanoparticles

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• 作者：Claire Goldmann ; R茅mi Lazzari ; Xavier Paquez ; C茅dric Boissi猫re ; Fran莽ois Ribot ; Cl茅ment Sanchez ; Corinne Chan茅ac ; David Portehault
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：July 28, 2015
• 年：2015
• 卷：9
• 期：7
• 页码：7572-7582
• ISSN：1936-086X

文摘

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鈥搗is 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 s and d bands of the gold core that yields 鈥済iant鈥?red shifts of the plasmon band, up to 40 nm for spherical particles in the size range of 3鈥? 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.