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Updated: Aug 9, 2026
Fabrication of Carbon Nanotube High-Frequency Nanoelectronic Biosensor for Sensing in High Ionic Strength Solutions
Published on: July 22, 2013
Effect of solution pH and ionic strength on the stability of poly(acrylic acid)-encapsulated multiwalled carbon
Aihua Liu1, Takashi Watanabe, Itaru Honma
1Nano-Energy Materials Group, Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Umezono 1-1-1, Tsukuba 305-8568, Japan. liu.aihua@aist.go.jp
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 approximately 0.13 V (versus Ag/AgCl) with the linear range of 4-100 microM by differential pulse voltammetry.
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