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624309 
Journal Article 
A sensitive nonenzymatic hydrogen peroxide sensor based on DNA-Cu2+ complex electrodeposition onto glassy carbon electrode 
Zeng, X; Liu, X; Kong, B; Wang, Y; Wei, W 
2008 
1 
Sensors and Actuators B: Chemical
ISSN: 0925-4005
EISSN: 1873-3077 
133 
2 
381-386 
Abstract: In this paper, DNA–Cu2+ complex was electrodeposited onto the surface of glassy carbon (GC) electrode, which fabricated a DNA–Cu2+/GC electrode sensor to detect H2O2 with nonenzyme. Cyclic voltammogram of DNA–Cu2+/GC electrode showed a pair of well-defined redox peaks for Cu2+/Cu+. Moreover, the electrodeposited DNA–Cu2+ complex exhibited excellent electrocatalytic behavior and good stability for the detection of H2O2. The effects of Cu2+ concentration, electrodeposition time and determination conditions such as pH value, applied potential on the current response of the DNA–Cu2+/GC electrode toward H2O2 were optimized to obtain the maximal sensitivity. The linear range for the detection of H2O2 is 8.0×10−7 M to 4.5×10−3 M with a high sensitivity of −40.25μAmM−1, a low detection limit of 2.5×10−7 M and a fast response time of within 4s. In addition, the sensor has good reproducibility and long-term stability and is interference free. [Copyright 2008 Elsevier] Copyright of Sensors & Actuators B: Chemical is the property of Elsevier Science Publishers B.V. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts) 
HYDROGEN peroxide; ELECTROFORMING; ELECTRODES, Carbon; ELECTROCATALYSIS