4.6 Article

Free-standing conductive hydrogel electrode for potentiometric glucose sensing

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RSC ADVANCES
卷 12, 期 9, 页码 5369-5373

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ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ra08956k

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  1. JSPS KAKENHI [JP20J21302]

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Flexible conductive polymer hydrogels are being researched as electrode materials for electrochemical biosensors due to their high conductivity, biocompatibility, and sensitivity. However, their fragility requires a supporting substrate, affecting their mechanical toughness and application potential.
Flexible conductive polymer hydrogels are attracting attention as an electrode material. Electrochemical biosensors with conductive polymer hydrogels have been developed because they have some advantages such as biocompatibility, high conductivity, 3D nanostructure, solvated surface, and enlarged interface. Conductive polymer hydrogels bearing receptor molecules such as enzymes in its 3D nanostructure enable the detection of target analytes with high sensitivity. However, because such hydrogels are fragile, they cannot stand on their own and a supporting substrate is required to fabricate them. This means that the loss of mechanical toughness is detrimental for their application to flexible biosensors. In this study, we have proposed a free-standing conductive hydrogel electrode with no coating on a substrate, which is composed of polyaniline with phenyl boronic acid including polyvinyl alcohol, for potentiometric glucose sensing. In addition, its electrical responsivity to glucose has been confirmed by investigating its mechanical properties at various glucose concentrations, considering the hydrogel compositions.

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