The excellent peroxidase-like activity of uniform CuCo2O4 microspheres with oxygen vacancy for fast sensing of hydrogen peroxide and ascorbic acid,New Journal of Chemistry

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The excellent peroxidase-like activity of uniform CuCo2O4 microspheres with oxygen vacancy for fast sensing of hydrogen peroxide and ascorbic acid
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020-12-15 , DOI: 10.1039/d0nj05026a
Shuai Han _{1,

2,

3,

4,

5} , Xiaohan Chen _{1,

2,

3,

4,

5} , Yifei Fan _{1,

2,

3,

4,

5} , Yuexing Zhang _{5,

6,

7} , Zhongdong Yang _{1,

2,

3,

4,

5} , Xia Kong _{1,

2,

3,

4,

5} , Zhenxue Liu _{1,

2,

3,

4,

5} , Qingyun Liu _{1,

2,

3,

4,

5} , Xianxi Zhang _{5,

8,

9,

10}

Affiliation

High catalytic activity is essential for constructing a rapid and facile colorimetric sensor to determine H₂O₂ and interrelated biomolecules. CuCo₂O₄ microspheres were successfully prepared using a facile hydrothermal and pyrolysis method. The excellent peroxidase-like performance of CuCo₂O₄ microspheres was evaluated by employing a chromogenic substrate, colorless 3,3′,5,5′-tetramethylbenzidine (TMB), which can be catalytically oxidized by H₂O₂ into a blue ox-TMB product within only 1 min. Fluorescence results reveal that the catalytic activity of CuCo₂O₄ is attributed to the increasing amount of ˙OH from the decomposition of H₂O₂ and theoretical simulations by Materials Studio proved that the existence of a large number of oxygen vacancies effectively enhanced the catalytic performance. Based on the high catalytic activity of CuCo₂O₄ microspheres, a rapid colorimetric sensor with high selectivity has been designed for detecting H₂O₂ and ascorbic acid. Under optimal reaction conditions, the linear response ranges of H₂O₂ and AA are 1.00–10.00 mM and 1.00–10.00 μM. The detection limits of H₂O₂ and AA are 132.70 μM and 0.57 μM, respectively.

中文翻译：

具有氧空位的均匀CuCo2O4微球具有出色的过氧化物酶样活性，可快速检测过氧化氢和抗坏血酸

高催化活性对于构建快速便捷的比色传感器以确定H ₂ O ₂和相关生物分子至关重要。采用简便的水热热解法成功制备了CuCo ₂ O ₄微球。通过使用发色底物无色3,3'，5,5'-四甲基联苯胺（TMB）评估了CuCo ₂ O ₄微球的优异过氧化物酶性能，该底物可被H ₂ O ₂催化氧化为蓝牛。 -TMB产品仅需1分钟。荧光结果表明，CuCo ₂ O ₄的催化活性这归因于H ₂ O ₂分解中˙OH的增加，Materials Studio的理论模拟证明大量氧空位的存在有效地提高了催化性能。基于CuCo ₂ O ₄微球的高催化活性，设计了一种具有高选择性的快速比色传感器，用于检测H ₂ O ₂和抗坏血酸。在最佳反应条件下，H ₂ O ₂和AA的线性响应范围为1.00-10.00 mM和1.00-10.00μM。H ₂ O ₂的检出限和AA分别为132.70μM和0.57μM。

更新日期：2021-01-15

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