A sensitivity-controlled hydrogen peroxide sensor based on self-assembled Prussian Blue modified electrode |
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Authors: | Yu Liu Zhenyu Chu Wanqin Jin |
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Institution: | State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, 5 Xinmofan Road, Nanjing 210009, PR China |
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Abstract: | In this communication, a hydrogen peroxide (H2O2) sensor based on self-assembled Prussian Blue (PB) modified electrode was reported. Thin film of PB was deposited on the electrode by self-assembly process including multiple sequential adsorption of ferric ions and hexacyanoferrate ions. The as-prepared PB modified electrode displayed sufficient stability for practical sensing application. At an applied potential of ?0.05 V vs. Ag/AgCl (sat. KCl), PB modified electrode with 30 layers exhibited a linear dependence on H2O2 concentration in the range of 1 × 10?6–4 × 10?4 M (r = 0.9998) with a sensitivity of 625 mA M?1 cm?2. It was found that the sensitivity of H2O2 sensors could be well controlled by adjusting the number of deposition cycles for PB preparation. This work demonstrates the feasibility of self-assembled PB modified electrode in sensing application, and provides an effective approach to control the sensitivity of PB-based amperometric biosensors. |
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