Behavior of toxic gas sensor based on conducting polypyrrole

Jung Joon Lee, Dohyuk Yoo, Chanil Park, Jung Hyun Kim, Hyang Hee Choi

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


A sensor for two types of ammonia (NH3) and carbon monoxide (CO) is fabricated on silicon substrate by using the drop-coating method and the sensor performance is investigated. Polypyrrole, an electro-conductive plastic, is used as the sensing material of the gas sensor. The gas sensor functions to maintain a constant gate voltage in a state that facilitates measurement of the conductivity of the gate, source, and drain having a source electrode and the drain electrode of a field effect transistor channel between the structures. The sensor exhibits an increase/decrease of the resistance upon exposure to a low concentration of NH3 and CO gas. This approach can be applied for highly sensitive room-temperature sensing of CO and NH3 at sub-ppm concentrations and for the development of very low-power devices. The synthesized conducting polypyrrole was characterized via field emission scanning electron microscopy (FE-SEM) and Fourier transform infrared spectroscopy (FTIR). The electronic transport properties of the sensors are measured in a field effect transistor geometry under ambient conditions. The sensing properties of the conducting polypyrrole gas sensor at sub-ppm gas concentrations are described.

Original languageEnglish
Pages (from-to)280-286
Number of pages7
JournalMacromolecular Symposia
Issue number1
Publication statusPublished - 2015 Aug 1

Bibliographical note

Publisher Copyright:
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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