Chinese Journal of Applied Chemistry ›› 2009, Vol. 26 ›› Issue (12): 1456-1460.

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Ag@SiO2 Nanocomposites Providing Metal-Enhanced Fluorescence Release and Glucose detection

XIA Xiao-Dong, YI Ping-Gui*, YU Xian-Yong   

  1. (School of Chemistry and Chemical Engineering,Hunan University of Science and Technology,Xiangtan 411201)
  • Received:2008-11-14 Revised:2009-05-21 Published:2009-12-10 Online:2009-12-10

Abstract:

Ag@SiO2 and rhodamine-doped Ag@SiO2 nanocomposites were prepared. Rhodamine fluorescence intensity enhanced 4.7 fold due to metal-enhanced fluorescence. The Ag core was easily oxidized by H2O2, enhancing the fluorescence release of rhodamine . Glucose oxidase was immobilized on the layer of SiO2 shell by chemical cross linked cluster. A novel method to detect glucose was developed based on metal-enhance fluorescence release with concentration range of 0.2~6.8 mmol/L and 0.02 mmol/L detection limitation. Speedy detection response was obtained upon the Ag core fast oxidation by H2O2 .

Key words: Ag@SiO2, nanocomposites, metal-enhance fluorescence, metal-enhance fluorescence release, glucose detection