Issue 4, 2012

Preparation of novel core-shell silica particles for pH sensing using ratiometric fluorescence approach

Abstract

Core-shell silica particles encapsulating two luminescent dyes with different emission wavelengths were prepared for ratiometric fluorescence sensing of pH. The composite core-shell structure particles contained a polyacrylonitrile (PAN) core surrounding a silica shell. Fluorescein isothiocyanate (FITC) encapsulated in the silica shell was taken as an indicator, Fluorescence emission from Ru(dpp)3(ClO4)2 immobilized in PAN core was used as a reference light. The ratiometric fluorescence signal from the core-shell silica particles were found with a linear range from pH 5.80 to 7.50 (R2 = 0.997). In addition, the morphology of the core-shell silica particles, the effects of temperature and co-existing substances were investigated. The core-shell silica particles were successfully applied to determination of pH value in water and urine samples.

Graphical abstract: Preparation of novel core-shell silica particles for pH sensing using ratiometric fluorescence approach

Article information

Article type
Paper
Submitted
19 Jan 2012
Accepted
25 Feb 2012
First published
21 Mar 2012

Anal. Methods, 2012,4, 1001-1004

Preparation of novel core-shell silica particles for pH sensing using ratiometric fluorescence approach

T. Ye, Y. Du, C. He, B. Qiu, Y. Wang and X. Chen, Anal. Methods, 2012, 4, 1001 DOI: 10.1039/C2AY25073J

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