Synthesis and characterization of carboxylated polybenzimidazole and its use as a highly sensitive and selective enzyme-free H2O2 sensor

Mu Yi Hua, Hsiao Chien Chen, Rung Ywan Tsai, Yann Lii Leu, Yin Chih Liu, Jinn Tsyy Lai

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

A novel polyelectrolyte, poly[N-(1-one-butyric acid)benzimidazole] (PBI-BA), was synthesized and used to fabricate an amperometric hydrogen peroxide (H2O2) sensor. It was found that PBI-BA can be oxidized by H2O2 and produce a current response during electrochemical reduction. This mechanism was used to develop an enzyme-free H2O2 sensor. Under optimal experimental conditions, the sensor showed high reproducibility, selectivity and stability. The stability of the PBI-BA electrode after annealing at 100 °C was also studied. Interestingly, the sensitivity of the modified electrode was 15.2% higher than that without heat treatment. The sensor was sensitive toward H2O 2 over a linear range from 6.2 μM to 5.0 mM with a detection limit of 3.1 μM. Because graphene sheets (Gs) suspend readily in the polyelectrolyte solution, a PBI-BA-Gs/Au electrode was also fabricated, improving the sensor's performance dramatically: this sensor detected H 2O2 over a linear range of 2.5 μM to 5 mM, with a correlation coefficient of 0.998 (n = 5) and a sensitivity of 1056 μA mM -1 cm-2.

Original languageEnglish
Pages (from-to)7254-7262
Number of pages9
JournalJournal of Materials Chemistry
Volume21
Issue number20
DOIs
Publication statusPublished - 2011 May 28

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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