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Issue 15, 2012
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Ultrasensitive gaseous NH3 sensor based on ionic liquid-mediated signal-on electrochemiluminescence

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Abstract

This work reports that ammonia (NH3) can be used as an efficient co-reactant for tris(2,2′-bipyridine)ruthenium(II) (Ru(bpy)32+) electrochemiluminescence (ECL) in ionic liquids (ILs), on the basis of which a signal-on ECL sensor for directly detecting gaseous NH3 has been developed. The NH3 ECL sensor has a very high sensitivity, with a detection limit of 10 ppt NH3 (at signal-to-noise ratio of 3) without any preconcentration. The high sensitivity is mainly due to the zero ECL background of Ru(bpy)32+ in the ILs, strong co-reactant ECL activity of NH3, and high solubility of NH3 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.

Graphical abstract: Ultrasensitive gaseous NH3 sensor based on ionic liquid-mediated signal-on electrochemiluminescence

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Publication details

The article was received on 16 Feb 2012, accepted on 22 May 2012 and first published on 23 May 2012


Article type: Paper
DOI: 10.1039/C2AN35218D
Analyst, 2012,137, 3514-3519

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

    L. Chen, D. Huang, Y. Zhang, T. Dong, C. Zhou, S. Ren, Y. Chi and G. Chen, Analyst, 2012, 137, 3514
    DOI: 10.1039/C2AN35218D

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