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Multi-components composed Cu2O@FePO4 core-cage structure to jointly promote fast electron transfer toward highly sensitive in situ detection of nitric oxide

Abstract

Electrochemical sensors actually involve an electrocatalytic process in efficient and selective energy conversions. In this work, we use different components to innovatively compose a core@cage material, in which the outer cage, iron phosphate, offers a high electrocatalytic ability to electrochemically oxidize NO, while the inner material, cuprous oxide, could absorb the intermediary HO- ions to kinetically promote NO oxidation for fast electron transfer, resulting in a strong synergistic effect. The unique core@cage structure also rises the active surface area and provides a plenty of channels by the porous cage for significantly enhanced mass transport. The as-prepared core@cage NO sensor shows a high sensitivity of 326.09 μAcm-2 μM-1, which is the highest among the reported non-noble metals based NO biosensors based on the electrooxidation scheme. A free-standing flexible NO sensor was further fabricated with the material to in situ detect NO released from cancer cells, demonstrating a low detection limit (0.45 nM) and fast response time (0.8 s). This work holds a great promise for its practical applications in diagnosis or research of complicated biological processes, especially in real-time in situ detection approaches.

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Supplementary files

Publication details

The article was received on 18 Dec 2018, accepted on 01 Feb 2019 and first published on 04 Feb 2019


Article type: Paper
DOI: 10.1039/C8NR10198A
Citation: Nanoscale, 2019, Accepted Manuscript

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    Multi-components composed Cu2O@FePO4 core-cage structure to jointly promote fast electron transfer toward highly sensitive in situ detection of nitric oxide

    Y. Zhang, S. Lu, Z. Z. Shi, Z. L. Zhao, Q. Liu, J. Gao, T. Liang, Z. Zou and C. M. Li, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C8NR10198A

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