Ultrasensitive gaseous NH3 sensor based on ionic liquid-mediated signal-on electrochemiluminescence.
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.
MOE Key Laboratory of Analysis and Detection Technology for Food Safety, and Department of Chemistry, Fuzhou Univiersity, Fujian 350108, China.
Lichan
L
Chen
Danjun
D
Huang
Yuanjin
Y
Zhang
Tongqing
T
Dong
Chen
C
Zhou
Shuyan
S
Ren
Yuwu
Y
Chi
Guonan
G
Chen
D015082:2,2'-Dipyridyl / Q000031:analogs & derivatives / Q000737:chemistry; D000641:Ammonia / Q000032:analysis*; D056831:Coordination Complexes; D055664:Electrochemical Techniques; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D049449:Luminescence; D008163:Luminescent Measurements; D017975:Ruthenium Compounds
D015082:2,2'-Dipyridyl; D000641:Ammonia; D056831:Coordination Complexes; D007093:Imidazoles; D052578:Ionic Liquids; C547232:tris(2,2-bipyridine)-ruthenium(II); D017975:Ruthenium Compounds