A perovskite-type KNbO3 nanoneedles based biosensor for direct electrochemistry of hydrogen peroxide |
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| Authors: | Bin Cai Minggang Zhao Ye Wang Yu Zhou Hui Cai Zhizheng Ye Jingyun Huang |
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| Affiliation: | 1. Department of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China;2. Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou, China |
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| Abstract: | A KNbO3 nanoneedles (KNs) based hydrogen peroxide (H2O2) biosensor was first proposed. Perovskite-type KNs can directly catalyze H2O2. The mechanism can be explained by Molecular Orbital Principles, with the formation of σ-bonding between the eg orbital of surface niobium ions and surface adsorbed oxygen-related intermediate species. Direct electron transfer between the Horseradish peroxidase (HRP) and electrode surface was achieved. Co-catalyst system of both HRP and KNbO3 was introduced to the oxidation of H2O2, thus the as-prepared biosensor exhibited high sensitivity (750 μA mM−1 cm−2) and ultrafast response (1–2 s) to H2O2. Therefore, KNs provide a promising material for enzymes assembly and sensing application. |
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| Keywords: | D Perovskite KNbO3 Hydrogen peroxide biosensor Direct electron transfer |
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