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Effects of Surfactants on the Performance of Humidity Sensor

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  • Chunjie Wang
  • Aihua Zhang
  • Hamid Reza Karimi

Abstract

Nanosized 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 ( -C) has the largest specific surface area and the smallest particle size among these three samples. The humidity sensor fabricated by -C shows higher performance than those used -P and -S. The impedance of the -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 humidity sensors can be improved effectively by the addition of cationic surfactant.

Suggested Citation

  • Chunjie Wang & Aihua Zhang & Hamid Reza Karimi, 2014. "Effects of Surfactants on the Performance of Humidity Sensor," Mathematical Problems in Engineering, Hindawi, vol. 2014, pages 1-6, February.
  • Handle: RePEc:hin:jnlmpe:723050
    DOI: 10.1155/2014/723050
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