Preparation of bio-chemical sensor electrodes by using electrical impedance properties of carbon nanotube based bulk materials

Dae Sup So, Hoon Huh, Heejin Kim, Haiwon Lee, Inpil Kang

Research output: Contribution to journalArticle


To develop chemical and biosensors, this paper studies sensing characteristics of bulk carbon nanotube (CNT) electrodes by means of their electrical impedance properties due to their large surface area and excellence chemical absorptivity. The sensors were fabricated in the form of film and nano web style by using composite process for mass production. The bulk composite electrodes were fabricated with singlewall and multi-wall carbon nanotubes based on host polymers such as Nafion and PAN, using a solution-casting and an electrospinning technique. The resistance and the capacitance of electrodes were measured with LCR meter under the various amounts of buffer solution to study the electrical impedance change properties of them. On the experimental of sensor electrode, impedance characteristics of the composite electrode are affected by its host polymer and nanofiller and its sensing response showed saturated result after applying some amounts of buffer solution for test chemical. Especially, the capacitance values showed drastic changes while the resistance values only changed within few percent range. It is deduced that the ions in the solution penetrated and diffused into the electrodes surface changed the electrical properties of the electrodes much like a doping effect.

Original languageEnglish
Pages (from-to)495-499
Number of pages5
JournalApplied Chemistry for Engineering
Issue number5
Publication statusPublished - 2010 Oct 1



  • Bio-chemical sensor
  • Carbon nanotube
  • Nano bulk material
  • Nano composite

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