首页|Visual test paper based on Au/δ-MnO2 hollow nanosphere oxidase-like activity regulation using hexavalent chromium as a smart switch
Visual test paper based on Au/δ-MnO2 hollow nanosphere oxidase-like activity regulation using hexavalent chromium as a smart switch
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Paper-based sensing platform is a point of need analytical toolkit for safety testing.However,the sensi-tivity,specificity,and simplicity are still challenging.Herein,we report a novel strategy(Au/δ-MnO2 hollow nanosphere and 3,3',5,5'-tetramethylbenzidine(TMB)induced test strips for signal-on detection)that can be utilized for hexavalent chromium(Cr6+)detection.Inter-estingly,Cr6+(CrO42-)as a smart switch can remarkably enhance the oxidase-like activity of Au/δ-MnO2 hollow nanosphere.The presence of Cr6+can regulate the surface electronic redistribution of Au/δ-MnO2 and adjust the geometric configuration,which leads to the improvement in oxidase-like activity of Au/δ-MnO2.As a proof-of-concept application,a visual paper-based sensing platform of Cr6+along with quantitative analysis by the test strips was successfully constructed.This paper-based sensing platform exhibits a linear range with excellent selectivity for other interfering substances and lower limit of detection of 0.09 μmol·L-1,providing a promising toolkit at-home Cr6+measurement and environmental monitoring.
Point of needColorimetric biosensing platformAu/δ-MnO2 hollow nanosphereTest stripCr6+
NETL
NSTL
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