title: One-step immobilization of tris(2,2'-bipyridyl)ruthenium(II) via vapor-surface sol-gel deposition towards solid-state electrochemiluminescence detection.
abstract: A novel method for immobilization of tris(2,2'-bipyridyl)ruthenium(II) (Ru(bpy)(3)Cl(2)) on electrode surfaces based on the vapor-surface sol-gel deposition strategy is first demonstrated in this paper. Ru(bpy)(3)Cl(2) immobilized sol-gel (Ru(bpy)(3)Cl(2)/sol-gel) films were characterized by UV-vis spectroscopy and field-emitted scanning electron microscopy (FE-SEM). These results showed that Ru(bpy)(3)Cl(2) was successfully incorporated into the silica sol-gel film. It was found that many irregular Ru(bpy)(3)Cl(2)/sol-gel clusters were formed on surfaces through one deposition and thick sol-gel films were observed after further deposition. Electrochemical properties and electrochemiluminescence (ECL) behaviors of Ru(bpy)(3)Cl(2)/sol-gel films could be easily adjusted by deposition numbers and time. At last, the Ru(bpy)(3)Cl(2)/sol-gel film modified electrode was used for solid-state ECL detection of tripropylamine. The linear range was from 5.8x10(-8) to 2.4x10(-4)M with the detection limit of 5nM, which was three orders of magnitude lower than that from pure Nafion-modified electrodes. The ECL sensor also exhibited high stability, and still remained 92% response after being stored in air for 35 days. This method for immobilization of Ru(bpy)(3)Cl(2) is simple, convenient and low-cost relative to others, so it shows promising applications in solid-state ECL detection.
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Qian
authors.forename: Xiurong
authors.initials: X
authors.lastname: Yang