Highly Controlled Plasmonic Emission Enhancement from Metal-Semiconductor Quantum Dot Complex Nanostructures

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• 作者：Hiroyuki Naiki ; Akito Masuhara ; Sadahiro Masuo ; Tsunenobu Onodera ; Hitoshi Kasai ; Hidetoshi Oikawa
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：February 14, 2013
• 年：2013
• 卷：117
• 期：6
• 页码：2455-2459
• 全文大小：285K
• 年卷期：v.117,no.6(February 14, 2013)
• ISSN：1932-7455

文摘

We have fabricated well-defined nanostructures such as SiO₂-coated Ag nanoparticles (NPs) connected with quantum dots (QDs) (Ag/SiO₂-QDs) so as to control the fluorescence enhancement induced by localized surface plasmon resonance. Namely, the distance between Ag NP and QD should be noted as a controllable model to investigate the fluorescence enhancement effect. Actually, highly monodispersed Ag NP as a core was first coated with five thicknesses of SiO₂ as a shell, and then QDs were specifically adsorbed onto the surface of the amino-functionalized SiO₂-coated Ag NPs. As a result, the fluorescence intensity increased with the shell thickness as a result of excitation enhancement. On the other hand, the fluorescence intensity decreased when the shell thickness became thinner because of the induced quenching. Therefore, the distance between Ag NPs and QDs should be optimized to control and enhance the fluorescence intensity.