Journal
TALANTA
Volume 79, Issue 2, Pages 454-459Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2009.04.009
Keywords
Electrochemiluminescence; Ru(bpy)(3)(2+); Nafion/PSS; Ion-exchange; TPA
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Funding
- National Natural Science Foundation of China [20675078]
- Chinese Academy of Sciences [KJCX2 YWHO9]
- [2007CB714500]
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An effective electrochemiluminescence (ECL) sensor based on Nafion/poly(sodium 4-styrene sulfonate) (PSS) composite film-modified ITO electrode was developed. The Nafion/PSS/Ru composite film was characterized by atomic force microscopy, UV-vis absorbance spectroscopy and electrochemical experiments. The Nafion/PSS composite film could effectively immobilize tris(2,2'-bipyridyl)ruthenium(II) (Ru(bpy)(3)(2+)) via ion-exchange and electrostatic interaction. The ECL behavior of Ru(bpy)(3)(2+) immobilized in Nafion/PSS composite film was investigated using tripropylamine (TPA) as an analyte. The detection limit (S/N = 3) for TPA at the Nafion/PSS/Ru composite-modified electrode was estimated to be 3.0 nM, which is 3 orders of magnitude lower than that obtained at the Nafion/Ru modified electrode. The Nafion/PSS/Ru composite film-modified indium tin oxide (ITO) electrode also exhibited good ECL stability. In addition, this kind of immobilization approach was simple, effective, and timesaving. (C) 2009 Elsevier B.V. All rights reserved.
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