One-step immobilization of tris(2,2'-bipyridyl)ruthenium(II) via vapor-surface sol-gel deposition towards solid-state electrochemiluminescence detection |
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Authors: | Qian Lei Yang Xiurong |
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Institution: | a State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China b Graduate School of the Chinese Academy of Sciences, Beijing 100039, China |
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Abstract: | A novel method for immobilization of tris(2,2′-bipyridyl)ruthenium(II) (Ru(bpy)3Cl2) on electrode surfaces based on the vapor-surface sol-gel deposition strategy is first demonstrated in this paper. Ru(bpy)3Cl2 immobilized sol-gel (Ru(bpy)3Cl2/sol-gel) films were characterized by UV-vis spectroscopy and field-emitted scanning electron microscopy (FE-SEM). These results showed that Ru(bpy)3Cl2 was successfully incorporated into the silica sol-gel film. It was found that many irregular Ru(bpy)3Cl2/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)3Cl2/sol-gel films could be easily adjusted by deposition numbers and time. At last, the Ru(bpy)3Cl2/sol-gel film modified electrode was used for solid-state ECL detection of tripropylamine. The linear range was from 5.8 × 10−8 to 2.4 × 10−4 M with the detection limit of 5 nM, 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)3Cl2 is simple, convenient and low-cost relative to others, so it shows promising applications in solid-state ECL detection. |
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Keywords: | Vapor-surface sol-gel deposition Tris(2 2&prime -bipyridyl)ruthenium(II) Electrochemiluminescence |
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