Selective Outdoor Humidity Monitoring Using Epoxybutane Polyethyleneimine in a Flexible Microwave Sensor
نویسندگان
چکیده
The rise of gas-sensing applications and markets has led to microwave sensors associated polymer-based sensitive materials gaining a lot attention, as they offer the possibility target large variety gases (as polymers can be easily functionalised) at ultra-low power wirelessly (which is major concern in Internet Things). A two-channel microstrip sensor with one resonator coated 1,2 epoxybutane-functionalised poly(ethyleneimine) (EB-PEI) other left bare was designed fabricated for humidity sensing. sensor, characterised under controlled laboratory conditions, showed exponential response RH between 0 100%, which approximated −1.88 MHz/RH% (−0.03 dB/RH%) −8.24 (−0.171 ranges 30–80% 80–100%, respectively. This first reported use EB-PEI sensing, performances, especially high level (RH > 80%), compared transducer working frequencies, are better than state art. When further tested real outdoor shows satisfying 4.2 %RH mean absolute error. Most importantly, we demonstrate that selective relative alone, irrespective environmental variables acquired during campaign (O3, NO, NO2, CO, CO2, Temperature). sensitivities obtained outdoors 50–70% 70–100% (−0.61 MHz/%RH −3.68 MHz/%RH, respectively) were close lab results (−0.95 −3.51 respectively).
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ژورنال
عنوان ژورنال: Chemosensors
سال: 2022
ISSN: ['2227-9040']
DOI: https://doi.org/10.3390/chemosensors11010016