4.7 Article

A novel flexible Ag/AgCl quasi-reference electrode based on silver nanowires toward ultracomfortable electrophysiology and sensitive electrochemical glucose detection

Journal

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 9, Issue 6, Pages 13425-13433

Publisher

ELSEVIER
DOI: 10.1016/j.jmrt.2020.09.041

Keywords

Reference electrode; Silver nanowires; Electrophysiology; Glucose detection

Funding

  1. Liaoning Province -Shenyang National Laboratory for Materials Science Joint Research and Development Fund [2019010274-JH3/301]
  2. Liaoning BaiQianWan Talents Program [[2019]45]
  3. Dalian Science and Technology Innovation Funds [2018J13SN087]

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To miniaturize or integrate electrochemical devices, new types of nanoparticle-based Ag/AgCl quasi-reference electrodes (qREs) have been generated via screen printing and inkjet printing. However, their nanostructures and addition of binder materials produce unsatisfactory conductivity and sensitivity. Herein, a novel Ag/AgCl qRE with a nanowireand-nanoparticle (NWP) structure is developed. The unique NWP-Ag/AgCl qRE is first generated by drop coating silver nanowires (AgNWs) on poly(dimethylsiloxane) (PDMS), followed by chemical chlorination. Because the nanowires form well-connected network, the novel NWP-Ag/AgCl qRE creates efficient charge transport paths as well as porous 3D structures that enable faster electrolyte percolation. The NWP-Ag/AgCl qRE reaches 95% stable potential fast (6.4 s) and is extremely stable (at least 8000 s continuous measurement and 6-month shelf life). The NWP-Ag/AgCl qRE on PDMS provides ultracomfortable tactile experience that is suitable for skin-contact electrophysiology. The NWP-Ag/AgCl qRE has also been successfully applied to the detection of glucose with a linear range of 1 mu M-1900 mu M. This study establishes a new printer-free Ag/AgCl qRE fabrication method with simple chemistry. Furthermore, the new method is a truly transformatively efficient and cost-effective approach with substantial industrial applications to electrophysiology and electrochemical device-making. (C) 2020 The Authors. Published by Elsevier B.V.

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