Preparation of Localized Surface Plasmon Resonance Sensing Film with Gold Colloid by Electrostatic Assembly

Chem. J. Chinese Universities

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Preparation of Localized Surface Plasmon Resonance Sensing Film with Gold Colloid by Electrostatic Assembly

WANG Ye¹, BU Feng-Quan², GU Yue-Jiao¹, XU Ping², NING Xiao-Hua¹, XU Shu-Ping¹, ZHAO Bing¹, XU Wei-Qing¹*

1. State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China;
2. School of Pharmaceutical Science, Jilin University, Changchun 130021, China

Received:2008-02-04 Revised:1900-01-01 Online:2008-08-10 Published:2008-08-10
Contact: XU Wei-Qing

Abstract

Abstract: This paper presents a new method to prepare localized surface plasmon resonance(LSPR) sensing film by self-assembly of polyelectrolyte. The optical signal arises from the dependence of the peak intensity and position of the localized surface plasmon spectrum of gold nanoparticles upon the refractive index of the surrounding medium. By using an electrostatic layer-by-layer assembly approach-PDDA/PSS/PVTC, 28 nm diameter colloidal gold nanoparticles are immobilized upon a glass substrate. The method yields a LSPR sensing film with good reproducibility and excellent stability. The spectroscopic response of the LSPR sensing film was investigated. The shift in the peak extinction wavelength and the change in the corresponding intensity of the LSPR band as a function of the refractive index of the solution are 71 nm/RIU and 0.21 a.u./RIU, respectively. The penetration depth of the electromagnetic field excited by LSPR upon the response of the sensing film is estimated to be about 16 nm.

Key words: Localized surface plasmon resonance(LSPR), Sensing film, Gold colloid, Self-assembly

CLC Number:

O657.37

TrendMD:

WANG Ye¹, BU Feng-Quan², GU Yue-Jiao¹, XU Ping², NING Xiao-Hua¹, XU Shu-Ping¹, ZHAO Bing¹, XU Wei-Qing¹*. Preparation of Localized Surface Plasmon Resonance Sensing Film with Gold Colloid by Electrostatic Assembly[J]. Chem. J. Chinese Universities, doi: .

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Preparation of Localized Surface Plasmon Resonance Sensing Film with Gold Colloid by Electrostatic Assembly

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