A Highly Sensitive Amperometric Galactose Biosensor Based on Graphene-doped Sol-gel-derived Titania-Nafion Composite Films

Sumin Lee, Daeho Jeong, Sangjung Lee, Sungju Nam, Won Yong Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

A highly sensitive amperometric galactose biosensor was developed by encapsulating galactose oxidase within the graphene-doped sol-gel titania-Nafion composite film on platinized glassy carbon electrode. Due to the combined electrocatalytic activity of graphene and Pt NPs on the electrode towards hydrogen peroxide as well as the mesoporous nature of the titania-Nafion composite, the present galactose biosensor exhibited relatively fast response time under 2 s, high sensitivity of 40.6 mAM−1cm−2, and wide dynamic range over three orders of magnitude with a detection limit of 3.78×10−6 M (S/N=3). In addition, the biocompatible composite in the biosensor secures excellent long-term stability.

Original languageEnglish
Pages (from-to)629-639
Number of pages11
JournalElectroanalysis
Volume34
Issue number4
DOIs
Publication statusPublished - 2022 Apr

Bibliographical note

Publisher Copyright:
© 2021 Wiley-VCH GmbH.

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Electrochemistry

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