Effects of surfactants on the performance of CeO2 humidity sensor
Journal article, Peer reviewed
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Original versionWang, C., Zhang, A., & Karimi, H. R. (2014). Effects of surfactants on the performance of CeO2 humidity sensor. Mathematical Problems in Engineering, 2014. doi: 10.1155/2014/723050 10.1155/2014/723050
Nanosized CeO 2 powders were synthesized via hydrothermal method with different types of surfactants (polyethylene glycol (PEG), cetyltrimethylammonium bromide (CTAB), and sodium dodecylbenzenesulfonate (SDBS)). X-ray diffraction, Raman spectroscopy, and transmission electron microscopy were utilized to characterize the phase structures and morphologies of the products. The sample with CTAB as surfactant (CeO 2 -C) has the largest specific surface area and the smallest particle size among these three samples. The humidity sensor fabricated by CeO 2 -C shows higher performance than those used CeO 2 -P and CeO 2 -S. The impedance of the CeO 2 -C sensor decreases by about five orders of magnitude with relative humidity (RH) changing from 15.7 to 95%. The response and recovery time are 7 and 7 s, respectively. These results indicate that the performance of CeO 2 humidity sensors can be improved effectively by the addition of cationic surfactant. © 2014 Chunjie Wang et al.
Published version of an article in the journal: Mathematical Problems in Engineering. Also available from the publisher at: http://dx.doi.org/10.1155/2014/723050