Fabrication of a carbon fiber paper as the electrode and its application toward developing a sensitive unmediated amperometric biosensor

Chiun-Jye Yuan*, Chung Liang Wang, Teng Yang Wu, Kuo Chu Hwang, Wei Chi Chao

*Corresponding author for this work

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

Carbon fiber paper (CFP), a material frequently used as the diffusion layer in fuel cells, was found recently to exhibit a potential as an electrode for the development of sensitive, unmediated biosensors. After nitrogen plasma treatment, the CFP exhibited a quasi-reversible behavior to the redox couple (e.g., ferricyanide) with an electron transfer rate constant of 7.2 × 10-3 cms-1. This rate constant is approximately double that of a Pt-electrode and is much higher than that of many carbon-based electrodes. The unmediated CFP-based tyrosinase biosensor fabricated for this study exhibited an optimal working potential and operating pH value of -0.2V and 6.5, respectively. Compared to other unmediated tyrosinase biosensors, the CFP-based tyrosinase biosensor offers a high sensitivity for the monitoring of phenolic compounds (17.8, 7.1, 5.2 and 3.7 μA μM-1 cm-2 for catechol, phenol, bisphenol and 3-aminophenol, respectively). The lowest detection limit for catechol, phenol, bisphenol and 3-aminophenol was 2, 5, 5 and 12nM, respectively. Furthermore, this biosensor exhibited a good repeatability, a fast response time (around 10s), and a wide linear dynamic range of detection for phenolic compounds.

Original languageEnglish
Pages (from-to)2858-2863
Number of pages6
JournalBiosensors and Bioelectronics
Volume26
Issue number6
DOIs
StatePublished - 15 Feb 2011

Keywords

  • Amperometric biosensor
  • Carbon fiber paper
  • Nitrogen plasma
  • Phenolic compounds
  • Tyrosinase

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