Rice husk ash as a new humidity sensing material and its aging behavior

Rice husk ash (RHA), a by-product of a biomass combustion plant, was investigated as a new humidity sensing material. The raw material was first calcined at 500 °C for 3 h and then characterized by X-ray diffraction (XRD), N2 adsorption, laser granulometry and field emission-scanning electron microscopy (FE-SEM). Thick-film sensors were fabricated by screen-printing technique onto α-alumina substrates with Pt interdigitated electrodes and fired...