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An enzyme-free capacitive glucose sensor based on dual-network glucose-responsive hydrogel and coplanar electrode

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Abstract

Glucose sensors are vital devices for blood glucose detection in the diabetes care. Different from traditional electrochemical devices based on glucose oxidase, the glucose sensor based on the glucose-responsive hydrogel is more robust owing to its enzyme-free principle. However, integrating the high sensitivity, fast response, wide measuring range and low-cost fabrication into a hydrogel sensor is still challenging. In this study, we present a physical capacitive sensor, which consists of interdigital carbon electrodes (ICEs) fabricated by a direct laser writing technology and glucose-responsive hydrogel (DexG-Con A hydrogel) built by UV curing in situ. The dielectric property of DexG-Con A hydrogel changes accordingly with the change in environmental glucose concentration. Experimental results demonstrate that in a glucose concentration range of 0–30 mM, the proposed hydrogel sensor is capable of measuring the glucose level in a repeatable and reversible manner, showing a short responsive time of less than 2 min and a high sensitivity of 8.81 pF mM−1 at a glucose range of 0–6 mM. Owing to its simple fabrication process, low-cost and high performance, the proposed glucose sensor shows great potential on batch production for continuous glucose monitoring application.

Graphical abstract: An enzyme-free capacitive glucose sensor based on dual-network glucose-responsive hydrogel and coplanar electrode

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Supplementary files

Article information


Submitted
18 Aug 2020
Accepted
01 Oct 2020
First published
07 Oct 2020

Analyst, 2020, Advance Article
Article type
Paper

An enzyme-free capacitive glucose sensor based on dual-network glucose-responsive hydrogel and coplanar electrode

Y. Cai, D. Yang, R. Yin, Y. Gao, H. Zhang and W. Zhang, Analyst, 2020, Advance Article , DOI: 10.1039/D0AN01672A

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