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Open Access Nano Express

Fluorescence Quenching of Alpha-Fetoprotein by Gold Nanoparticles: Effect of Dielectric Shell on Non-Radiative Decay

Jian Zhu, Jian-jun Li, A-qing Wang, Yu Chen and Jun-wu Zhao*

Author Affiliations

The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi’an Jiaotong University, Xian Ning West Road 28#, 710049, Xi’an, People’s Republic of China

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Nanoscale Research Letters 2010, 5:1496-1501  doi:10.1007/s11671-010-9668-0

Published: 15 June 2010

Abstract

Fluorescence quenching spectrometry was applied to study the interactions between gold colloidal nanoparticles and alpha-fetoprotein (AFP). Experimental results show that the gold nanoparticles can quench the fluorescence emission of adsorbed AFP effectively. Furthermore, the intensity of fluorescence emission peak decreases monotonously with the increasing gold nanoparticles content. A mechanism based on surface plasmon resonance–induced non-radiative decay was investigated to illuminate the effect of a dielectric shell on the fluorescence quenching ability of gold nanoparticles. The calculation results show that the increasing dielectric shell thickness may improve the monochromaticity of fluorescence quenching. However, high energy transfer efficiency can be obtained within a wide wavelength band by coating a thinner dielectric shell.

Keywords:
Fluorescence quenching; Gold nanoparticles; Alpha-fetoprotein (AFP); Non-radiative decay; Dielectric shell