Effect of solution pH and ionic strength on the stability of poly(acrylic acid)-encapsulated multiwalled carbon nanotubes aqueous dispersion and its application for NADH sensor

Aihua Liu, Takashi Watanabe, Itaru Honma, Jin Wang, Haoshen Zhou

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

The optimal conditions to prepare water-soluble, stable poly(acrylic acid)-wrapped multiwalled carbon nanotubes (PAA-MWNTs) complex is presented. PAA-MWNTs shows high stability within weak acid to weak basic pH condition. The complex also shows good endurance to moderate ionic strengths in the buffer solution. The PAA-MWNTs complex film-covered electrode demonstrates stable, excellent electrocatalytic activity to oxidize NADH, which makes it possible to prepare NADH sensor at a low potential of ∼0.13 V (versus Ag/AgCl) with the linear range of 4-100 μM by differential pulse voltammetry.

Original languageEnglish
Pages (from-to)694-699
Number of pages6
JournalBiosensors and Bioelectronics
Volume22
Issue number5
DOIs
Publication statusPublished - 2006 Dec 15
Externally publishedYes

Keywords

  • Differential pulse voltammetry
  • Ionic strength
  • NADH sensor
  • Poly(acrylic acid)-multiwalled carbon nanotube complex
  • Solubilization of multiwalled carbon nanotubes
  • Solution pH

ASJC Scopus subject areas

  • Biotechnology
  • Biophysics
  • Biomedical Engineering
  • Electrochemistry

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