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Issue 8, 2010
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Size control and immobilization of gold nanoparticles stabilized in an ionic liquid on glass substrates for plasmonic applications

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Abstract

Gold (Au) nanoparticles were prepared by sputter deposition of Au metal in an ionic liquid (IL) of 1-butyl-3-methylimidazolium hexafluorophosphate (BMI-PF6). The size of Au nanoparticles was increased from 2.6 to 4.8 nm by heat treatment at 373 K. The nanoparticles uniformly dispersed in the IL were densely immobilized on a glass substrate surface modified with a silane coupling agent having an imidazole functional group by spreading the Au particle IL solution on the substrates, followed by heat treatment at 373 K. The optical property of the thus-obtained films was tunable by controlling the size of Au nanoparticles in the IL and the degree of immobilization. An intense localized surface plasmon resonance (LSPR) peak was observed in each Au particle film, and the wavelength of the LSPR peak could be controlled by changing the size of nanoparticles in the IL solution before immobilization. Photoexcitation of the LSPR peak caused enhancement of the photoluminescence of CdTe nanoparticles immobilized on Au nanoparticle films, probably due to the locally enhanced electric field formed around Au nanoparticles.

Graphical abstract: Size control and immobilization of gold nanoparticles stabilized in an ionic liquid on glass substrates for plasmonic applications

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Publication details

The article was received on 15 Jul 2009, accepted on 27 Aug 2009 and first published on 16 Sep 2009


Article type: Paper
DOI: 10.1039/B914230D
Phys. Chem. Chem. Phys., 2010,12, 1804-1811

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    Size control and immobilization of gold nanoparticles stabilized in an ionic liquid on glass substrates for plasmonic applications

    T. Kameyama, Y. Ohno, T. Kurimoto, K. Okazaki, T. Uematsu, S. Kuwabata and T. Torimoto, Phys. Chem. Chem. Phys., 2010, 12, 1804
    DOI: 10.1039/B914230D

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