The Transactions of the Korean Institute of Electrical Engineers C (대한전기학회논문지:전기물성ㆍ응용부문C)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

Capacitive Humidity Sensors using lodine-doped Polyphenylacetylene Thin Films

요오드가 도우핑된 폴리페닐아세틸렌 박막을 이용한 정전용량형 습도센서

  • Published : 2000.06.01
Download PDF
⟨ Previous Next ⟩

Abstract

We report the results of a preliminary investigation on capacitive humidity sensors using iodine-doped polyphenylacetylene(PPA) thin films. PPA was prepared from phenylacetylene(PA), chemically doped with iodine, and characterized by DSC, $^1H$-NMR and FTIR spectra. The iodine-doped PPA sensors showed a sensitivity of 0.20pF/%RH, a linearity of 3.8%FS, a negligible hysteresis, and a low temperature coefficients of $0.043~0.067pF/^{\circ}C$ over a wide range of relative humidity. These results are expected to open up the possibility of iodine-doped PPA thin films as relative humidity sensors.

Keywords

References

  1. Y. Sakai, Y. Sadaoka, M. Matsuguchi, and V.L. Rao, 'Humidity sensors using microporous film of polyethylene-graft-poly-(2-hydroxyl-3-methacryloxypropyl trimethyl-ammonium chloride),' J. Mater. Sci., Vol. 24, pp. 101-104, 1989 https://doi.org/10.1007/BF00660939
  2. Y. Sakai, Y. Sadaoka, and M. Matsuguchi, 'Humidity sensors based on polymer thin films,' Sensors and Actuators B, Vol. 35-36, pp. 85-90, 1996 https://doi.org/10.1016/S0925-4005(96)02019-9
  3. A.R.K. Ralston, C.F. Klein, P.E. Thoma,D. and D. Denton, 'A model for the relative environmental stability of a series of polyimide capacitance humidity sensors,' Sensors and Actuators B, Vol. 34, pp. 343-348, 1996 https://doi.org/10.1016/S0925-4005(97)80011-1
  4. H. Wang, C.D. Feng, S.L. Sun, C.U. Segre, and J.R. Stetter, 'Comparison of conductometric humidity-sensing polymers,' Sensors and Actuators B, Vol. 40, pp. 211-216, 1997 https://doi.org/10.1016/S0925-4005(97)80264-X
  5. S.Takeda, 'Electrode Structure and heat treatment effects on stabilization of capacitive humidity sensor with plasma-polymerized thin film,' Jpn. J. Appl. Phys., Vol. 38, pp. 909-912, 1999
  6. A. Furlani, G. Iucci, M.V. Russo, A. Bearzotti and A. D'Amico, 'Iodine-doped polyphenylacetylene thin film as a humidity sensor,' Sensors and Actuators B, Vol. 8, pp. 23-126, 1992 https://doi.org/10.1016/0925-4005(92)85018-R
  7. E.C.M. Hermans, 'CO, $CO_2,\;CH_4$and $H_2O$ sensing by polymer covered interdigitated electrode structures,' Sensors and Actuators, Vol. 5, pp. 181-186, 1984 https://doi.org/10.1016/0250-6874(84)80008-6
  8. M. Asdente, V. Ottoboni, A. Furlani and M.V. Russo, 'The influence of humidity on the electrical conductivity of iodine doped polyphenylacetylene,' Chemtronics, Vol. 5, pp. 75-?, 1991
  9. A. Furlani, G. Iucci, M.V. Russo, A. Bearzotti and A. D'Amico, 'Thin films of iodine-polyphenylacetylene as starting materials for humidity sensors,' Sensors and Actuators B, vol. 7, pp. 447-450, 1992 https://doi.org/10.1016/0925-4005(92)80341-T
  10. A. Furlani, M.V. Russo, A.M. Cianciusi, F. Bruno, R. Mercuri, A. Paoletti, and A. D'Amico, 'FeCl3 doped polyacetylenes: humidity and temperature dependence of electrical conductivity,' Chemtronics, vol. 3, p.239, 1988
  11. F. Cataldo, 'A New Method Of Synthesizing Polyphenylacetylene,' Polymer International, vol.39, 91-99, 1996 https://doi.org/10.1002/(SICI)1097-0126(199602)39:2<91::AID-PI446>3.0.CO;2-B
  12. H. Shibata, M. Ito, M. Asakursa and K. Watanabe, 'A Digital Hydrometer Using a Polyimide Film Relative Humidity Sensor,' IEEE Trans. Instrum. and Meas., Vol. 45, pp. 555-569, 1996 https://doi.org/10.1109/19.492788