Abstract
ZnO nanorods were drop-casted over gold inter-digitated electrodes to fabricate chemi-resistive sensors. The response of this sensor to analyte gas Carbon Dioxide was studied as a function of the analyte concentration and sensor operating temperature. The sensing response was continuously logged in an experimental set-up containing a glass-chamber, substrate heater, micro-probes, mass-flow controllers and a datalogger. The resistance measurement was carried out, in the temperature range 100 C–450 degree in steps of 50 C, and in the CO2 concentrations range 460 ppm–2550 ppm. The sensor-response/sensitivity increases linearly with the analyte concentration, for all temperatures. The sensitivity of the sensor increases with temperature.
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