基于离子液体介导的信号增强电化学发光的超高灵敏气态 NH3 传感器。

Ultrasensitive gaseous NH3 sensor based on ionic liquid-mediated signal-on electrochemiluminescence.

机构信息

MOE Key Laboratory of Analysis and Detection Technology for Food Safety, and Department of Chemistry, Fuzhou Univiersity, Fujian 350108, China.

出版信息

Analyst. 2012 Aug 7;137(15):3514-9. doi: 10.1039/c2an35218d. Epub 2012 Jun 25.

DOI:10.1039/c2an35218d

PMID:22728516

Abstract

This work reports that ammonia (NH(3)) can be used as an efficient co-reactant for tris(2,2'-bipyridine)ruthenium(II) (Ru(bpy)(3)(2+)) electrochemiluminescence (ECL) in ionic liquids (ILs), on the basis of which a signal-on ECL sensor for directly detecting gaseous NH(3) has been developed. The NH(3) ECL sensor has a very high sensitivity, with a detection limit of 10 ppt NH(3) (at signal-to-noise ratio of 3) without any preconcentration. The high sensitivity is mainly due to the zero ECL background of Ru(bpy)(3)(2+) in the ILs, strong co-reactant ECL activity of NH(3), and high solubility of NH(3) in imidazolium-based ILs. Additionally, the ECL sensor shows an excellent selectivity against common interfering gases and a wide linear response range from 10 ppt to 10 ppm.

摘要

这项工作表明，氨（NH(3)）可用作三（2,2'-联吡啶）钌(II)（Ru(bpy)(3)(2+)）电化学发光（ECL）在离子液体（ILs）中的有效共反应物，在此基础上开发了一种用于直接检测气态 NH(3)的信号开启 ECL 传感器。该 NH(3) ECL 传感器具有非常高的灵敏度，检测限低至 10 ppt NH(3)（信噪比为 3），无需任何预浓缩。高灵敏度主要归因于 ILs 中 Ru(bpy)(3)(2+)的零 ECL 背景、NH(3)强的共反应物 ECL 活性以及 NH(3)在基于咪唑的 ILs 中的高溶解度。此外，ECL 传感器对常见干扰气体表现出优异的选择性和从 10 ppt 到 10 ppm 的宽线性响应范围。