Scalable Approach to Develop High Performance Chemiresistive Nitric Oxide Sensor

We report on a low cost and scalable approach to develop a chemiresistive nitric oxide sensor based on iron oxide nanorods sensing film. The device was found to detect nitric oxide (NO) gas at an optimal temperature of 250 °C. The device required very low bias voltage (i.e., 1 mV) to operate and was sensitive to NO gas in the concentration range 0.5 ppm–2.75 ppm. The response of the device in this range found to be 1.49% (0.5 ppm) - 15.2% (2.75 ppm) with average response and recovery time of less than 10 seconds. The device shows non-linear behavior with average hysteresis error of the sensor around 7%. These experimental findings were supported with the density functional theory calculations. These features along with high stability and decent repeatability of the nanorod-based gas sensing device makes it a worthwhile alternative to current available technology.