Fabrication and characterization of a fluorescent sensor based on Rh 6G-functionlized silica nanoparticles for nitrite ion detection

Document Type

Article

Publication Date

8-1-2012

Abstract

In this paper, a rhodamine derivative of p-hydroxybenzaldlehyde rhodamine 6G hydrozone (denoted as Rh 6G-OH) is covalently grafted onto the surface of silica nanoparticles, giving a novel fluorescent chemosensing hybrid material (denoted as Rh 6G-SiO 2) for the detection of nitrite ion. The FT-IR spectra confirm that Rh 6G-OH has been successfully grafted onto the surface of SiO 2 nanoparticles, which effectively prevents the sensing probe leakage out of SiO 2 supporting matrix. Rh 6G-SiO 2 sensor shows a good linearity between the fluorescence intensity of Rh 6G-SiO 2 and the concentration of nitrite ion with a detection limit down to 1.2 μM, which results from a dramatic fluorescence reducing by the addition of nitrite ion upon the suspension of Rh 6G-SiO 2. A high selectivity for nitrite ion in the presence of interference ions is demonstrated. The sensing mechanism of Rh 6G-SiO 2 toward nitrite ion is discussed in detail and found to be a static quenching process. © 2012 Elsevier B.V. All rights reserved.

Publication Source (Journal or Book title)

Sensors and Actuators, B: Chemical

First Page

946

Last Page

953

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