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One-step immobilization of Ru(bpy)(3)(2+) in a silica matrix for the construction of a solid-state electrochemiluminescent sensor with high performance.
MedLine Citation:
PMID:  23014294     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
An electrochemically induced sol-gel process has been used to efficiently immobilize Ru(bpy)(3)(2+) in a 3D porous silica film matrix deposited on a glassy carbon electrode (GCE), forming a solid state electro-chemiluminescence (ECL) sensor. In this approach, electrolysis of the GCE at cathodic voltages from a solution of ammonium fluorosilicate containing Ru(bpy)(3)(2+) results in the reduction of water to hydroxyl ions and hydrogen bubbles. The former product catalyzes the hydrolysis of ammonium fluorosilicate to form a silica film; while the hydrogen bubbles act as a dynamic template in forming a porous silica matrix. Therefore, a large quantity of Ru(bpy)(3)(2+) ions can be efficiently encapsulated in the porous silica matrix, and the formed porous structure offers a good mass transport path. The fabricated [Ru(bpy)(3)](2+) solid-state ECL sensor shows high sensitivity and stability towards the determination of tripropylamine (TPA). The electrochemically generated luminescence signal shows a good linear relationship to TPA concentration ranging from 3.46 × 10(-10) to 3.70 × 10(-6) M and 3.70 × 10(-6) to 3.60 × 10(-4) M, with an extremely low detection limit of 17 pM (S/N = 3). The present approach is effective for encapsulation of various molecules and could find wide application in the construction of various sensors.
Authors:
Jing Li; Fang-Nan Xiao; Xing-Hua Xia
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-27
Journal Detail:
Title:  The Analyst     Volume:  -     ISSN:  1364-5528     ISO Abbreviation:  Analyst     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372652     Medline TA:  Analyst     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China. xhxia@nju.edu.cn.
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