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

查看全文 作　　者：Fangning [1]Liu;Zhe [1]Li;Hengya [1]Wei;Peng [1]Xu;Ge [1]Kang;Shicheng [1]Zhu;Tingting [1]Wang;Ruxue [1]He;Chuanxia [1]Chen;Yizhong [1]Lu 高影响力作者 机构地区：[1]School of Materials Science and Engineering,University of Jinan,Jinan 250022,China高影响力机构 出　　处：《Nano Research》索引2024年第17卷第4期,共10页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Nos.22172063 and 21904048);the Young Taishan Scholar Program(No.tsqn201812080);the Independent Cultivation Program of Innovation Team of Ji’nan City(No.2021GXRC052). 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-CoN_(3))could serve as highly efficient oxidase mimic.Compared with the typical planar four-coordination structure(SA-CoN_(4)),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 O_(2) molecule and thus improve their oxidase-like activity.Based on the enhanced oxidase-like activity of SA-CoN_(3),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 0.66μM.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. 关 键 词：single-atom nanozymes ASYMMETRIC organophosphorus pesticides oxygen adsorption SMARTPHONE
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