Polyelectrolyte self-assembled thin films containing cyclo-tetrachromotropylene for chemical and bio-sensing

NABOK, A. V., DAVIS, F., HASSAN, A. K., RAY, A. K., MAJEED, R. and GHASSEMLOOY, Z. (1999). Polyelectrolyte self-assembled thin films containing cyclo-tetrachromotropylene for chemical and bio-sensing. Materials Science and Engineering C, 8-9, 123-126.

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Abstract

Thin composite films containing cyclo-tetrachromotropylene (Chromol) were deposited onto glass slides by means of polyelectrolyte self-assembly technique. The films obtained were characterised by UV-visible spectral measurements, and a linear dependence of absorbance on the number of deposited layers has been found. It was also found that the shape of UV-visible spectra depends on the presence of ammonia in both gaseous and liquid phases. Other amines, such as il-butylamine, can also affect the spectra. An attempt of urease immobilisation has been done using polyelectrolyte self-assembly. Composite films containing both Chromol and urease demonstrated the possibility of optical registration of enzyme reactions, in particular, decomposition of urea which releases ammonia. After immersion into urea solution, the samples show spectral transformations similar to those observed in the presence of ammonia. (C) 1999 Elsevier Science S.A. All rights reserved.

Item Type:	Article
Research Institute, Centre or Group:	Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group
Identification Number:	10.1016/S0928-4931(99)00013-2
Depositing User:	Ann Betterton
Date Deposited:	20 Apr 2010 11:20
Last Modified:	20 Apr 2010 11:20
URI:	http://shura.shu.ac.uk/id/eprint/1413

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