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Mass detection of glucose, which is required in many applications, remains challenging. The commercial enzyme-based glucose test strips cannot be reused, and current non-enzymatic glucose sensors exhibit a narrow range of detection and slow glucose oxidation kinetics. Herein, controlled etching of Prussian blue analogue (PBA) nanocubes at the vertices is conducted and Au nanoparticles (Au NPs) are subsequently inlaid in the etched cavities by in-situ reduction of HAuCl4. The unique AuNP-PBA nanocomplexes exhibit low electrochemical potential for glucose oxidation, high electrocatalytic activity, and rapid redox electron transfer rate. Covalent immobilization of the Au-inlaid nanomaterials on a fine Au wire leads to a non-enzymatic glucose sensor with a particularly wide linear detection range (10 μM to 16 mM), excellent anti-interference, and fast response. More importantly, the sensor is reusable, and its sensitivity is well maintained even after 150 times of detection. This new-concept material promises to enable high-throughput glucose detection at a low cost, which is essential in diabetic management and other healthcare applications.


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Reusable electrochemical non-enzymatic glucose sensors based on Au-inlaid nanocages

Show Author's information Lu ShenZhen LiangZhiyu ChenCan WuXuefeng HuJieyu Zhang( )Qing Jiang( )Yunbing Wang
National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610065, China

Abstract

Mass detection of glucose, which is required in many applications, remains challenging. The commercial enzyme-based glucose test strips cannot be reused, and current non-enzymatic glucose sensors exhibit a narrow range of detection and slow glucose oxidation kinetics. Herein, controlled etching of Prussian blue analogue (PBA) nanocubes at the vertices is conducted and Au nanoparticles (Au NPs) are subsequently inlaid in the etched cavities by in-situ reduction of HAuCl4. The unique AuNP-PBA nanocomplexes exhibit low electrochemical potential for glucose oxidation, high electrocatalytic activity, and rapid redox electron transfer rate. Covalent immobilization of the Au-inlaid nanomaterials on a fine Au wire leads to a non-enzymatic glucose sensor with a particularly wide linear detection range (10 μM to 16 mM), excellent anti-interference, and fast response. More importantly, the sensor is reusable, and its sensitivity is well maintained even after 150 times of detection. This new-concept material promises to enable high-throughput glucose detection at a low cost, which is essential in diabetic management and other healthcare applications.

Keywords: gold nanoparticles, electrochemistry, Prussian blue analogues, non-enzymatic glucose sensors, reusable sensors

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Publication history
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Acknowledgements

Publication history

Received: 25 November 2021
Revised: 14 January 2022
Accepted: 08 February 2022
Published: 18 April 2022
Issue date: July 2022

Copyright

© Tsinghua University Press 2022

Acknowledgements

Acknowledgements

This work was supported by the National Key Research and Development Program of China (No. 2018YFC1106802) and the Postdoctoral Interdisciplinary Research Fund in Sichuan University (No. 0900904153016).

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