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A Novel Electrogenerated Chemiluminescence (ECL) Sensor Based on Ru(bpy) 3 2+ ‐Doped Titania Nanoparticles Dispersed in Nafion on Glassy Carbon Electrode
Author(s) -
Hun Xu,
Zhang Zhujun
Publication year - 2008
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200704091
Subject(s) - nafion , nanoparticle , materials science , electrode , detection limit , glassy carbon , electrochemistry , electrochemiluminescence , electrochemical gas sensor , chemiluminescence , ruthenium , inorganic chemistry , chemical engineering , nanotechnology , chemistry , cyclic voltammetry , catalysis , organic chemistry , chromatography , engineering
A novel electrogenerated chemiluminescence (ECL) sensor based on Ru(bpy) 3 2+ ‐doped titania (RuDT) nanoparticles dispersed in a perfluorosulfonated ionomer (Nafion) on a glassy carbon electrode (GCE) was developed in this paper. The electroactive component‐Ru(bpy) 3 2+ was entrapped within the titania nanoparticles by the inverse microemulsion polymerization process that produced spherical sensors in the size region of 38±3 nm. The RuDT nanoparticles were characterized by electrochemical, transmission electron and scanning microscopy technology. The Ru(bpy) 3 2+ encapsulation interior of the titania nanoparticles maintains its ECL efficiency and also reduces Ru(bpy) 3 2+ leaching from the titania matrix when immersed in water due to the electrostatic interaction. This is the first attempt to prepare the RuDT nanoparticles and extend the application of electroactive component‐doped nanoparticles into the field of ECL. Since a large amount of Ru(bpy) 3 2+ was immobilized three‐dimensionally on the electrode, the Ru(bpy) 3 2+ ECL signal could be enhanced greatly, which finally resulted in the increased sensitivity. The ECL analytical performance of this ECL sensor for tripropylamine (TPA) was investigated in detail. This sensor shows a detection limit of 1 nmol/L for TPA. Furthermore, the present ECL sensor displays outstanding long‐term stability.