Herein we report the preparation of hybrid Co porphyrin-SnO2 thin films by sol-gel technique and a study of their sensing properties. The porphyrin structure bears a carboxylic group to improve its stabilization into the oxide matrix. SEM characterization of the spin-coated thin films deposited onto alumina substrates showed a homogeneously morphology. These CoTCPP-SnO 2 sensors showed fast and reversible responses towards the detection of methanol vapors and highest responses were obtained at the working temperature of 250Â°C. Optical characterization of the heated CoTCPP-SnO 2 thin films indicated that the metalloporphyrin is still present after heating up to 320Â°C, while it was completely decomposed after thermal treatment at 400Â°C. These results support the presence of a catalytic effect of the CoTCPP at lower temperature, which induces a significant increase in the sensor responses at 250Â°C, while at higher temperature, where the porphyrin is thermally decomposed, the hybrid CoTCPP-SnO2 sensors behave similarly to pure SnO2 devices. On the contrary, no significant differences in the sensor responses where observed in the case of CO detection, showing that metalloporphyrins can be used to modify the selectivity of SnO 2 sensors. Â© 2004 Elsevier B.V. All rights reserved.
NARDIS, S., MONTI, D., DI NATALE, C., D'AMICO, A., Siciliano, P., Forleo, A., et al. (2004). Preparation and characterization of cobalt porphyrin modified tin dioxide films for sensor applications. In Sensors and Actuators, B: Chemical (pp.339-343).
|Autori:||NARDIS, S; MONTI, D; DI NATALE, C; D'AMICO, A; Siciliano, P; Forleo, A; Epifani, M; Taurino, A; Rella, R; PAOLESSE, R|
|Titolo:||Preparation and characterization of cobalt porphyrin modified tin dioxide films for sensor applications|
|Nome del convegno:||17th European Conference on Solid-State Transducers (Eurosensors XVII)|
|Luogo del convegno:||Guimaraes, PORTUGAL|
|Anno del convegno:||SEP 21-24, 2003|
|Data di pubblicazione:||2004|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.snb.2004.04.063|
|Settore Scientifico Disciplinare:||Settore CHIM/07 - Fondamenti Chimici delle Tecnologie|
|Tipologia:||Intervento a convegno|
|Citazione:||NARDIS, S., MONTI, D., DI NATALE, C., D'AMICO, A., Siciliano, P., Forleo, A., et al. (2004). Preparation and characterization of cobalt porphyrin modified tin dioxide films for sensor applications. In Sensors and Actuators, B: Chemical (pp.339-343).|
|Appare nelle tipologie:||02 - Intervento a convegno|