The Influence Of ZnO Sensor Modification By Porphyrins On To The Character Of Sensor Response To Volatile Organic Compounds.

摘要

The influence of modification of semi conductive ZnO and SnO2 sensors by porphyrins and their metal complexes on the parameters of sensor response to volatile organic compounds, ethanol, acetone and benzene, was analyzed. The concentration of volatile organic compounds Ci varied in the range of 1-200 ppm. The sensor response was characterized by specific sensitivity y, =1000R, C, ), where AR = R, — Ro , R. Ro are measurable and initial resistance of the sensitive sensor layer correspondingly. The modification of sensors by porphyrins caused changes in sensor response and first of all decrease of ZnO sensor temperature from 300 to 100°C at which the threshold of sensitivity is achieved (as used at this method C, m`n=0.1 ppm). It also caused a change in sing of the parameter y , which was of importance for creating "electronic nose" sensor systems. At the same time the modification of ZnO sensor by metal complexes of porphyrin did not change sensor response.