Abstract
Ba-doped CeO2 nanowireswere obtained from CeO2 particles through a facile composite-hydroxide-mediated (CHM) route. Theproducts were characterized by x-ray diffraction (XRD), field emission scanningelectron microscopy (FE-SEM), transmission electron microscopy (TEM) andhigh-resolution transmission electron microscope (HRTEM). The formation processof the product was discussed. Humidity sensors based on the source materialCeO2 particles,Ba-doped CeO2 nanowires grown for 12 and 72 h, were fabricated. The responses tohumidity for static and dynamic testing proved that both doping Ba intoCeO2 andconverting morphology into a nanowire can improve the humidity sensitivity. The resistance changes from465 to 3.9 MΩ as the relative humidity (RH) increases from 25% to 88%, indicating promising applications of Ba-dopedCeO2 nanowires in environmental monitoring.
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