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Small and battery-powered gas sensors offer the ability to detect airborne viruses, environmental pollutants, or health data for next-generation public health and safety applications through low-cost, distributed monitoring. Unfortunately, conventional gas sensors require heating to temperatures often greater than 100°C, which requires significant power consumption (e.g., 25mW in [1]) and cannot be rapidly duty-cycled due to long thermal-time constants. To eliminate the need for heating, other prior work utilizes techniques such as gas-selective polymer films that change the frequency of RF MEMS resonators [2]; the 2.5GHz operation in [2], however, required readout circuits that consume ~1mW, which is still too high for applications that demand extreme system and battery miniaturization. Recent work has shown that Molecularly Imprinted Polymer (MIP)-based gas sensors, which are functionalized based on the shape …