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Polyaniline and polythiophene-based gas sensors

F. TUDORACHE1,* , N. REZLESCU1, N. TUDORACHE2, A. M. CATARGIU3, M. GRIGORAS3

Affiliation

  1. National Institute of Research & Development for Technical Physics, 47 D. Mangeron Blvd., Iasi, 700050, Romania
  2. “Al. I. Cuza” University, Faculty of Physics, 11A Carol I Blvd., Iasi, 700506, Romania
  3. “P. Poni” Institute of Macromolecular Chemistry, 41A Gr. Ghica Voda Alley, Iasi, 700487, Romania

Abstract

Three samples of semiconducting polymer, polyaniline, emeraldine base form (PAn-EB), polyaniline, emeraldine salt form (PAn-ES) and polythiophene (PT), were prepared and their sensing properties to reducing gases were investigated. The gas sensing characteristics were obtained by measuring the sensitivity as a function of various controlling factors, like operating temperature, composition and concentration of the gas, and finally the response time. The sensitivity of three semiconducting polymers to acetone, ethyl alcohol and liquefied petroleum gas (LPG) was compared. It was revealed that PAn-EB is the most sensitive to ethyl alcohol and liquefied petroleum gas, and can be used as gas sensor. The strong interaction between ethyl alcohol and porous PAn-EB can explain the selective sensitivity to ethyl alcohol and LPG and negligible sensitivity to the other reducing gases.

Keywords

Gas sensor, Conducting polymer, Sensitivity, Reducing gas, Polyamline, Emeraldine, Polythiophene.

Citation

F. TUDORACHE, N. REZLESCU, N. TUDORACHE, A. M. CATARGIU, M. GRIGORAS, Polyaniline and polythiophene-based gas sensors, Optoelectronics and Advanced Materials - Rapid Communications, 3, 4, April 2009, pp.379-382 (2009).

Submitted at: Feb. 26, 2009

Accepted at: April 23, 2009