Electrochemiluminescence Sensor Based on Multiwalled Carbon Nanotubes Doped Polyvinyl Butyral Film Containing Ru(bpy)32+ as Chemiluminescence Reagent

An effective electrochemiluminescence (ECL) sensor was developed by combining Ru(bpy)(3)(2+) with multiwalled carbon nanotubes(MWNTs) doped polyvinyl butyral (PVB) film. The doped film can prevent the leakage of Ru(bpy)(3)(2+) efficiently and the immobilized Ru(bpy)(3)(2+) kept its electrocatalytic activity toward the electrooxidation of tripropylamine (TPA), suggesting PVB and MWNTs were proper matrix to immobilize Ru(bpy)(3)(2+) by hydrophobic interaction. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and electrochemiluminescent characterization were employed to study the presented sensor. A wide linear dynamic range of 6 orders of magnitude between ECL intensity and concentration of TPA was found from 1 x 10(-8) M to 5 x 10(-2) M, with a detection limit of 3.5 x 10(-9) M.