THE INFLUENCE OF SUBSTRATE MATERIAL ON THE CHARACTERISTICS OF BEND SENSORS FOR WEARABLE ELECTRONICS

Abstract

The influence of different types of substrates on the electrical characteristics of bending sensors, which were made on the basis of such materials as: polyimide, polyethylene, nanocellulose (NC) and polyvinyl alcohol (PVA), was studied. The atomic force microscopy (AFM) technique was used to assess the surface morphology. The electrical characteristics of sensors against bending were measured for each of the types of substrates. The obtained results showed that the roughness of the substrate has an effect on the electrical characteristics of the bending sensors. The maximum sensitivity values ​​of the sensors (1.42) were observed for a rougher substrate based on nanocellulose.At the same time, such sensors are somewhat inferior in terms of time drift and reversibility to sensors on smoother substrates. The established regularities are of significant importance for the selection of optimal substrates for bending sensors depending on specific applications, in particular, such devices are advisable to use as disposable sensors for wearable electronics, especially considering the biodegradability of NCs.