The character of the response of ZnO and SnO2 sensors modified with porphyrins to volatile organic compounds

摘要

The influence of the modification of the surface of ZnO and SnO2 sensors with 5,10,15,20-tetraphenylporphyrin on the parameters of sensor response to high-volatility organic substances was analyzed. The organic substances used were ethanol, acetone, and benzene. The sensor response was characterized by specific sensitivity gamma determined as the ratio between a change in the resistance of the sensitive sensor layer and the volume concentration of high-volatility organic compounds introduced into the system. The modification of the sensors with tetraphenylporphyrin caused changes in sensor response, including a change in the sign of the gamma parameter, which was of importance for creating "electronic nose" sensor systems.