期刊
JOURNAL OF MATERIALS CHEMISTRY B
卷 9, 期 23, 页码 4663-4669出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1tb00608h
关键词
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资金
- Natural Science Foundation of China [51872048]
- Natural Science Foundation of Fujian Province [2016J01222, 2018J01518]
- International Cooperation Foundation of Fujian Province [2009I0016]
Ternary oxides with multi-catalytic sites, such as spinel zinc vanadate (Zn3V3O8 NSs), exhibit exceptional peroxidase-like activity due to their specific structure, making them suitable for use as colorimetric glucose sensors with high accuracy and selectivity.
Due to their specific spinel structure, ternary oxides with multi-catalytic sites on a highly active exposed surface are recommended as alternative bio-catalysts. Spinel zinc vanadate with two-dimensional nanosheets (Zn3V3O8 NSs) was synthesised using a one-step hydrothermal route with CTAB and glycine as a bi-surfactant, where each NS has a thin thickness (25 nm) and wide cross section (2 mu m). As a key parameter for peroxidase-like activity, the Michaelis-Menten constant (K-m) for Zn3V3O8 NSs was calculated to be 0.271 mM with TMB and 1.317 mM with H2O2 at optimum conditions, indicating a higher affinity for the exposed (011) facet towards horseradish peroxidases. This affinity is related to the geometric matching between V4+ active sites and the terminal amino groups of TMB. The V4+ ions on the (011) facet act as dangling bonds and readily react with H2O2 in a Fenton-like reaction. The peroxidase-like activity for Zn3V3O8 NSs is verified by the formation of [V(IV)-OO] by the O-2(-) and V5+ near V4+ sites, but oxidase activity for Zn3V3O8 NSs. Based on the peroxidase-like activity, Zn3V3O8 NSs were used as a colorimetric glucose sensor with a wide linear range from 0.01 to 0.5 mM and a detection limit (LOD = 3 sigma/S) of 2.81 x 10(-7) M. The colorimetric sensor also exhibited high accuracy and selectivity in synthetic perspiration samples.
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