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Journal of Materials Science

, Volume 43, Issue 4, pp 1305–1310 | Cite as

Conductometric gas sensing studies of tert-butyl silicon-[bis ethyloxy]-phthalocyanine LB films

  • Anwesha N. FernandesEmail author
  • Tim H. Richardson
Article

Abstract

Ultrathin Langmuir-Blodgett film properties of tert-butyl silicon-[bis ethyloxy]-phthalocyanine (tbPcSi(OC2 H5)2) have been studied and characterised. Surface pressure–area isotherms reveal an area per molecule of around 0.85 nm2, and that a compact ‘solid’ phase occurs in the region 10–30 m N m−1. LB films of different thicknesses were deposited onto gold interdigitated electrodes on glass in order to facilitate I–V measurements and assess the conductometric sensing properties in response to 5 ppm NO2. The I–V characteristic is Ohmic and yields conductivity in the range comparable to that obtained for other phthalocyanine monomers. The gas sensing behaviour of these films in response to NO2 was investigated and modelled using a double exponential model. Preliminary UV–visible spectroscopic investigations indicate that the film also responds optically.

Keywords

Phthalocyanine CoPc FePc NiPc Langmuir Blodgett Film 

Notes

Acknowledgement

AF would like to thank Mr Alex McNaughton for the use of the Accerlys software and Dr Alan Dunbar for helpful discussions.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Nanomaterial Engineering GroupUniversity of SheffieldSheffieldUK

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