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A transparent TMPyP/TiO2 composite thin film as an HCl sensitive optochemical gas sensor

Opened Access A transparent TMPyP/TiO2 composite thin film as an HCl sensitive optochemical gas sensor

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Autor: Cano, Manuel
Castillero Durán, Pedro
Roales, Javier
Brittle, Stuart
Richardson, Tim
Rodríguez González-Elipe, Agustín
Barranco Quero, Ángel
Fecha: 2010
Publicado en: Sensors and Actuators, B: Chemical, 150, 764-769.
Tipo de documento: Artículo
Resumen: Tetracationic porphyrin (TMPyP) molecules were incorporated into an optically transparent TiO2 thin film, prepared by Glancing Angle Physical Vapour Deposition (GAPVD), by simple infiltration (at pH 6.4). The preparation of optically transparent TMPyP/TiO2 composite thin films provides a method for the integration of the porphyrin molecules into photonic devices for direct monitoring of gases. Previously, UV-visible and fluorescence spectral techniques have been used to study the reversible protonation of TMPyP in aqueous solution. The optical spectrum of TMPyP shows an intense Soret band at 423 nm with a 22 nm red shift upon protonation by HCl. The experimental conditions for monitoring the concentration of HCl gas by absorption spectroscopy have been optimized. The maximum absorbance change was observed at the Soret band wavelength. A selected temperature of 80 °C and a 300 s recovery period were found to be the optimum operating parameters (response time t50 = 16.8 ± 0.7 s). The co...
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Cita: Cano, M., Castillero Durán, P., Roales, J., Brittle, S., Richardson, T., Rodríguez González-Elipe, A. y Barranco Quero, Á. (2010). A transparent TMPyP/TiO2 composite thin film as an HCl sensitive optochemical gas sensor. Sensors and Actuators, B: Chemical, 150, 764-769.
Tamaño: 719.0Kb
Formato: PDF

URI: https://hdl.handle.net/11441/71648

DOI: 10.1016/j.snb.2010.07.059

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