Functional validation of an additional device to the gas sensor for arbitrary control sensing properties

Abstract

In this study, we demonstrate the first device that can effectively modulate the sensing properties of a gas sensor. Using our device, existing gas sensors can behave as pseudo-multiple sensors with different sensing selectivities. We fabricated a proof-of-concept device and verified the control of the response characteristics of the sensor by applying voltages. The results showed that the sensor output to each gas increased by 26.0% for ammonia, decreased by 54.3% for acetic acid, and did not change for ethanol when a voltage of 50 V was applied. Sensor variations in machine-learning-based gas and odor sensing are important. Our device realizes a pseudo-increase in the number of sensor variations that does not depend on the type of sensing membrane, which is revolutionary.