Narrow Results

In this paper, Ce-doped CdAl layered double hydroxide (LDH) was first synthesized and the derivative CdO/Al₂O₃/CeO₂ composite oxide was prepared by calcining Ce-doped CdAl LDH. The structure, morphology and chemical state of the Ce doped CdAl LDH and CdO/Al₂O₃/CeO₂ were also investigated by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), solid state nuclear magnetic resonance (SSNMR), scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). The gas sensing properties of CdO/Al₂O₃/CeO₂ to ethanol were further studied and compared with CdO/Al₂O₃ prepared from CdAl LDH, CeO₂ powder as well as the calcined Ce salt. It turns out that CdO/Al₂O₃/CeO₂ sensor shows best performance in ethanol response. Besides, CdO/Al₂O₃/CeO₂ possesses short response/recovery time (12/72 s) as well as remarkable selectivity in ethanol sensing, which means composite oxides prepared from LDH are very promising in gas sensing application.