Application of Nanocellulose in Humidity Sensors for Biodegradable Electronics

This work describes methods for the preparation of pulp from non-wood plant materials, nanocellulose, for capacitive and resistive humidity sensors. The properties of nanocellulose from organosolvent pulps from wheat straw, kenaf, miscanthus, and reed were described. The nanocellulose was obtained by two methods – by hydrolysis of sulfuric acid and by oxidation of TEMPO (2,2,6,6-tetramethylpiperidin-l-oxyl). The response of capacitive and resistive humidity sensors based on nanocellulose was in the range of 0, 61-21nF and in the range of 1,3$\ast10^{1}$ – $2,1\ast10^{4}$ correspondingly in depend on initial raw materials, method of nanocellulose obtaining as well as weight of it on sensitive surface. The maximum value of sensitivity for both types of sensors reached up to 0,14 (% RH)$^{-1}$.