Abstract
CeO2 nanobelts were synthesized with three different types of surfactants (polyethyleneglycol [PEG], cetyltrimethyl ammonium bromide [CTAB], and sodium dodecylbenzene sulfonate [SDBS]) via hydrothermal method. X‐ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were utilized to characterize the phase structures and morphologies of the products. CeO2‐C (the sample with CTAB as surfactant) has the largest specific surface area among three samples. The humidity sensing performances of the corresponding sensors were also investigated. CeO2‐C shows high humidity sensitivity (the impedance decreases by about five orders of magnitude), rapid response–recovery characteristics (6 and 7 s), and narrow hysteresis loop (4%) at 100 Hz in the relative humidity range from 11% to 95%. Such results indicate that the cationic surfactant (CTAB) can effectively improve on the performance of CeO2 humidity sensors.
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