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Title: Optical response of monolayer films of a metal-free sulfonamido-porphyrin
Authors: Richardson, T. 
Smith, V. C. 
Johnstone, R. A. W. 
Sobral, A. J. F. N. 
Rocha-Gonsalves, A. M. d'A. 
Keywords: Chlorine; Porphyrin; Langmuir-Blodgett
Issue Date: 1998
Citation: Thin Solid Films. 327-329:(1998) 315-320
Abstract: The influence of gaseous chlorine on monolayers of metal-free meso-tetra(4-amino sulfonyl)phenylporphyrin is discussed. These films exhibit characteristic intense optical absorption bands in the region 400-700 nm. Upon exposure to chlorine vapour in the concentration range 0.1-10 ppm, the Soret and Q-bands decrease in intensity and new bands at ~455 nm and ~660 nm appear. The rate of response has been measured as a function of deposition surface pressure and gas concentration. Repeated dosing experiments have shown that reversible and reproducible sensing action occurs provided that a threshold concentration is not exceeded. The recovery of the original optical spectrum can be accelerated with moderate heat treatment (60°C for 10 min). Ageing experiments have shown that the basic response of the monolayer is not effected over a time period of at least 5 months.
DOI: 10.1016/S0040-6090(98)00652-X
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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