Capacitive Humidity Sensors Based on Nanocellulose for Biodegradable Electronics

The humidity sensor is an important device used in many areas of human life, such as agriculture, medicine, industry, meteorology and more. Most often, synthetic polymers are for the manufacture sensors, which after end their operation accumulated form electronic waste, polluting environment. Currently, biodegradable great demand. Such materials include nanocellulose, can be made from both wood plant raw materials. It has already been proven that nanocellulose a promising material use humidity-sensitive devices. However, it was not clear effect sensitive film’s thickness on characteristics sensors. In this work, capacitive sensors based were fabricated. Nanocellulose (NC) obtained reeds by TEMPO method. moisture-sensitive layer NC applied dripping. Static (sensitivity, response, hysteresis) dynamic (response time, recovery short- long-term stability) manufactured measured dependence mass film (from 0.3 to 3.6 mg) test signal frequency (100 Hz 1000 Hz). response increased with weight reached 1412 nF at 100 (783 Hz) sample 0.6 mg NC, then decreased further increase mass. sensitivity varied similarly, but maximum value observed 1.8 0.161 (%RH)-1 (0.165 shortest time had lowest s). With film, monotonically. Also, shows hysteresis (0.1%) also increasing layer. study short-term stability, samples weighing showed significantly higher level fluctuations (10 - 20%) compared (1 4%). So, you should larger (1.8… order improve stability view responce well repeatability characteristics, thin films (0.3… 0.5 used. direction research devices, particular modifying adding certain impurities.