Coordinatively unsaturated cobalt single-atom nanozymes for visual pesticides detection by smartphone-based platform

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外文摘要：By adjusting the coordination environment of single-atom catalysts,the enzyme-like activity can be finely tuned for highly sensitive biosensing.Herein,we demonstrated that coordinatively unsaturated cobalt-nitrogen sites doped within porous carbon(SA-CoN3)could serve as highly efficient oxidase mimic.Compared with the typical planar four-coordination structure(SA-CoN4),the as-obtained single-atom Co nanozymes anchored by three nitrogen atoms are found to display much higher oxidase-like catalytic efficiency.Combined theoretical and experimental analysis revealed that the coordinatively unsaturated Co sites could facilitate adsorption and activation of O2 molecule and thus improve their oxidase-like activity.Based on the enhanced oxidase-like activity of SA-CoN3,a paper/smartphone sensor for organophosphorus pesticides(OPs)was successfully constructed and used to quantify glyphosate in environmental and food samples with a low detection limit of 0.66 μM.This work not only highlights the important role of coordination unsaturation of SA nanozymes for promoting oxidase-like activity,but also provides an easy and cost-effective way to conduct effective quantification of OPs in the field.

外文关键词：

single-atom nanozymesasymmetricorganophosphorus pesticidesoxygen adsorptionsmartphone

作者：

Fangning Liu、Zhe Li、Hengya Wei、Peng Xu、Ge Kang、Shicheng Zhu、Tingting Wang、Ruxue He、Chuanxia Chen、Yizhong Lu

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作者单位：

School of Materials Science and Engineering,University of Jinan,Jinan 250022,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaYoung Taishan Scholar ProgramIndependent Cultivation Program of Innovation Team of Ji'nan City

项目编号：

2217206321904048tsqn2018120802021GXRC052

出版年：

2024

DOI：

10.1007/s12274-023-6039-6

纳米研究(英文版)

CSTPCD

ISSN：

年,卷(期)：2024.17(4)

参考文献量53