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However, the formation of insulating oxide films on EGaIn surfaces poses a significant impediment to translating electrochemical reactions, thereby limiting its use as an electrochemical biosensor. Here, functionalized EGaIn electrodes with reduced\u2010graphene\u2010oxide assembled EGaIn core\u2013shell particles (REGs) for soft and deformable electrochemical biosensors are presented. Exploiting EGaIn's capability as a reducing agent, REGs can undergo further modification with metal nanoparticles through additional galvanic replacement reactions. The REGs and metal\u2010coated REGs (M\u2010REGs) provide strong interfacial adhesion with the EGaIn current collector, exhibiting no exfoliation during and after the mechanical deformation. Moreover, RIDE and metal\u2010decorated RIDE (M\u2010RIDE) show excellent electrochemical sensing performances by taking advantage of the facile surface tunability of REGs, allowing simultaneous detection of ascorbic acid, dopamine, and uric acid, and enzymatic detection of glucose. The developed RIDE\/M\u2010RIDE paves the way for utilizing EGaIn in the development of soft and deformable electrochemical biosensors.<\/jats:p>","DOI":"10.1002\/adfm.202311696","type":"journal-article","created":{"date-parts":[[2023,11,21]],"date-time":"2023-11-21T18:08:01Z","timestamp":1700590081000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Functionalized EGaIn Electrodes with Tunable Reduced\u2010Graphene\u2010Oxide Assembled EGaIn Core\u2013Shell Particles for Soft and Deformable Electrochemical Biosensors"],"prefix":"10.1002","volume":"34","author":[{"given":"Dongwook","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Medical Engineering Yonsei University College of Medicine  Seoul 03722 Republic of Korea"},{"name":"Department of Chemistry Yonsei University  Seoul 03722 Republic of Korea"},{"name":"Center for Nanomedicine Institute for Basic Science (IBS)  Seoul 03722 Republic of 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