Highly controlled plasmonic emission enhancement from metal-semiconductor quantum dot complex nanostructures

Hiroyuki Naiki; Akito Masuhara; Sadahiro Masuo; Tsunenobu Onodera; Hitoshi Kasai; Hidetoshi Oikawa

doi:10.1021/jp305408p

Highly controlled plasmonic emission enhancement from metal-semiconductor quantum dot complex nanostructures

Hiroyuki Naiki, Akito Masuhara, Sadahiro Masuo, Tsunenobu Onodera, Hitoshi Kasai, Hidetoshi Oikawa

Research output: Contribution to journal › Article › peer-review

60 Citations (Scopus)

Abstract

We have fabricated well-defined nanostructures such as SiO ₂-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 SiO ₂-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.

Original language	English
Pages (from-to)	2455-2459
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	117
Issue number	6
DOIs	https://doi.org/10.1021/jp305408p
Publication status	Published - 2013 Feb 14

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title = "Highly controlled plasmonic emission enhancement from metal-semiconductor quantum dot complex nanostructures",

abstract = "We have fabricated well-defined nanostructures such as SiO 2-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 SiO 2-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.",

author = "Hiroyuki Naiki and Akito Masuhara and Sadahiro Masuo and Tsunenobu Onodera and Hitoshi Kasai and Hidetoshi Oikawa",

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T1 - Highly controlled plasmonic emission enhancement from metal-semiconductor quantum dot complex nanostructures

AU - Naiki, Hiroyuki

AU - Masuhara, Akito

AU - Masuo, Sadahiro

AU - Onodera, Tsunenobu

AU - Kasai, Hitoshi

AU - Oikawa, Hidetoshi

PY - 2013/2/14

Y1 - 2013/2/14

N2 - We have fabricated well-defined nanostructures such as SiO 2-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 SiO 2-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.

AB - We have fabricated well-defined nanostructures such as SiO 2-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 SiO 2-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.

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Highly controlled plasmonic emission enhancement from metal-semiconductor quantum dot complex nanostructures

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