Tao Chang, Xiaoxing Zhang, Wangting Liu, Caixin Sun
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Detecting oil dissolved gases using carbon nanotubes sensor
The detection and analysis of dissolved gases in oil is an important means to determine the early latent faults of oil-immersed power transformer. A dissolved gases in oil detection method is presented based on carbon nanotubes sensor. A kind of MWNTs (Multi-wall carbon nanotubes) gas sensor modified by mixed acid was developed based on printed circuit board to detect dissolved gases in oil. The electrical properties and gas sensing response mechanism of carbon nanotubes (CNTs) was analyzed. The gas sensing response for dissolved gases in oil was tested using the MWNTs sensor in the laboratory. Test results showed that, the developed MWNTs sensor has more defects, contains activity functional groups and with strong absorption capacity for dissolved gases in oil, which exhibits good sensitivity and fast response characteristics.
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