A flexible multifunctional sensor based on in situ reduction of Ag nanoparticles by yam polysaccharides.

Developing flexible multifunctional sensors that combine humidity, temperature, and strain sensing properties is a challenge. In this paper, PVA/YPs/HPO/AgNPs (PYHA) flexible composite films loaded with Ag nanoparticles (AgNPs) were synthesized through in situ reduction and solution casting using polyvinyl alcohol (PVA), yam polysaccharide (YPs), phosphoric acid (HPO), and silver nitrate (AgNO) as raw materials, which exhibited sensitivity to humidity, temperature, and strain. The prepared PYHA humidity sensor was capable of generating stable electrical signals through adsorption and desorption over the relative humidity (RH) range of 35-95 %.