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https://hdl.handle.net/10316/5280
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. | URI: | https://hdl.handle.net/10316/5280 | DOI: | 10.1016/S0040-6090(98)00652-X | Rights: | openAccess |
Appears in Collections: | FCTUC Química - Artigos em Revistas Internacionais |
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