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Erschienen in: Rare Metals 2/2024

18.11.2023 | Original Article

Visual test paper based on Au/δ-MnO2 hollow nanosphere oxidase-like activity regulation using hexavalent chromium as a smart switch

verfasst von: Wen-Chang Zhuang, Hai-Yue Zhang, Zhen-Yang Chen, Wen-Jing Cheng, Wei-Dan Na, Zhao Li, Lin Tian

Erschienen in: Rare Metals | Ausgabe 2/2024

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Abstract

Paper-based sensing platform is a point of need analytical toolkit for safety testing. However, the sensitivity, 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. Interestingly, 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.

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Metadaten
Titel
Visual test paper based on Au/δ-MnO2 hollow nanosphere oxidase-like activity regulation using hexavalent chromium as a smart switch
verfasst von
Wen-Chang Zhuang
Hai-Yue Zhang
Zhen-Yang Chen
Wen-Jing Cheng
Wei-Dan Na
Zhao Li
Lin Tian
Publikationsdatum
18.11.2023
Verlag
Nonferrous Metals Society of China
Erschienen in
Rare Metals / Ausgabe 2/2024
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI
https://doi.org/10.1007/s12598-023-02446-2

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