Enhancing Single-Nanoparticle Surface-Chemistry by Plasmonic Overheating in an Optical Trap

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• 作者：Weihai Ni ; Haojin Ba ; Andrey A. Lutich ; Frank J盲ckel ; Jochen Feldmann
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：September 12, 2012
• 年：2012
• 卷：12
• 期：9
• 页码：4647-4650
• 全文大小：237K
• 年卷期：v.12,no.9(September 12, 2012)
• ISSN：1530-6992

文摘

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.

Keywords:

Noble metal nanoparticles; plasmon resonance; colloidal chemistry; nano/microfluidics; gold nanorods; nic+heating&qsSearchArea=searchText">plasmonic heating