Optical fiber sensor for Hg(II) based on carbon dots

被引：211

作者：

Goncalves, Helena M. R. ^{[1
]}

Duarte, Abel J. ^{[2
]}

Esteves da Silva, Joaquim C. G. ^{[1
]}

机构：

[1] Univ Porto, Ctr Invest Quim, Dept Quim & Bioquim, Fac Ciencias, P-4169007 Oporto, Portugal

[2] Inst Super Engn Porto, REQUIMTE, P-4200072 Oporto, Portugal

来源：

BIOSENSORS & BIOELECTRONICS | 2010年 / 26卷 / 04期

基金：

英国科学技术设施理事会;

关键词：

Carbon dots; Fiber optics; Sol-gel immobilization; Mercury(II) sensing; SOL-GEL GLASS; MATRIX; ENTRAPMENT; COMPLEXES;

D O I：

10.1016/j.bios.2010.07.018

中图分类号：

Q6 [生物物理学];

学科分类号：

071011 ;

摘要：

An optical fiber sensor for Hg(II) in aqueous solution based on sol-gel immobilized carbon dots nanoparticles functionalized with PEG(200) and N-acetyl-t-cysteine is described. This sol-gel method generated a thin (about 750 nm), homogenous and smooth (roughness of 2.7 +/- 0.7 a) film that immobilizes the carbon dots and allows reversible sensing of Hg(II) in aqueous solution. A fast (less than 10 s), reversible and stable (the fluorescence intensity measurements oscillate less than 1% after several calibration cycles) sensor system was obtained. The sensor allow the detection of submicron molar concentrations of Hg(II) in aqueous solution. The fluorescence intensity of the immobilized carbon dots is quenched by the presence of Hg(II) with a Stern-Volmer constant (pH = 6.8) of 5.3 x 10(5) M-1. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：1302 / 1306

页数：5

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