Abstract
An ultralow cost vapor sensor platform is developed, incorporating a chemiresistor-based sensor that enables targeted sensing through surface functionalization. Humidity, ammonia, and acetone sensing are demonstrated by PEDOTPSS, DPP-CN, and graphene surface modification, respectively. The integrated USB connector, use of a standard HMI interface, and microcontroller interface allows us installation-free data collection on any device with a USB port.
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