(25c) Pd/TiO2 Nanofibrous Membrane and Its Application in Hydrogen Sensing
The Pd/TiO2 nanofibrous membrane was successfully fabricated. The as-prepared membranes were characterized by field-emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectrometry (EDX), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The Pd/TiO2 nanofibrous membranes show good mechanical and conductive properties, and offer an excellent sensing platform. Its application for hydrogen detection is demonstrated and the developed hydrogen sensor exhibits fast response, excellent recovery behavior, and good sensitivity. Two different hydrogen sensing mechanisms were realized in Pd/TiO2 nanofibrous membranes: resistance increase caused by the formation of palladium hydride and resistance decrease due to lattice-expansion-induced ?break-junction?.