Humidity sensors based on polyaniline nanofibres

Fan Wu Zeng, Xiao Xia Liu, Dermot Diamond, King Tong Lau*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

185 Citations (Scopus)


Humidity sensor based on polyaniline nanofibres was fabricated and its response to humidity was investigated. It was found that the sensor behaved differently compared to commonly known conducting polymer based sensors. The sensor responded to low relative humidity (<50% RH) normally by decreasing electrical resistance with increasing humidity. However, at higher RH the sensor reversed its responses by increasing the electrical resistance with humidity. It is believed that the unique structure of nanofibres, which is more susceptible to distortion during polymer swelling, is responsible for the 'reversed behaviour'. IR data confirmed that excess water absorption occurred and that a change in polymer oxidation state might also have taken place.

Original languageEnglish
Pages (from-to)530-534
Number of pages5
JournalSensors and Actuators, B: Chemical
Issue number2
Publication statusPublished - 7 Jan 2010
Externally publishedYes


  • Conducting polymer
  • Humidity sensor
  • PAni nanofibres
  • Polyaniline
  • Polymer swelling

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