Centro de Investigação em Química, Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade do Porto, Rua Campo Alegre 687, 4169-007 Porto, Portugal.
Biosens Bioelectron. 2010 Dec 15;26(4):1302-6. doi: 10.1016/j.bios.2010.07.018. Epub 2010 Jul 13.
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-L-cysteine is described. This sol-gel method generated a thin (about 750 nm), homogenous and smooth (roughness of 2.7±0.7 Å) 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 5.3×10(5) M(-1).
基于聚乙二醇（200）和 N-乙酰-L-半胱氨酸功能化的溶胶-凝胶固定化碳点纳米粒子的水溶液中 Hg(II) 的光纤传感器。该溶胶-凝胶方法生成了一种薄（约 750nm）、均匀且光滑（粗糙度为 2.7±0.7Å）的薄膜，可固定碳点，并允许在水溶液中可逆地感测 Hg(II)。获得了快速（少于 10s）、可逆和稳定（经过几个校准循环后荧光强度测量的波动小于 1%）的传感器系统。该传感器允许检测水溶液中亚微米摩尔浓度的 Hg(II)。Hg(II) 的存在使固定化碳点的荧光强度猝灭，其 Stern-Volmer 常数（pH=6.8）为 5.3×10(5)M(-1)。
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