Novel resistive-type humidity sensor based on multiwall carbon nanotube/polyimide composite films

Kum Pyo Yoo, Lee Taek Lim, Nam Ki Min, Myung Jin Lee, Chul Jin Lee, Chan Won Park

Research output: Contribution to journalArticlepeer-review

198 Citations (Scopus)


A novel resistive-type relative humidity (RH) sensor based on plasma-treated multiwall carbon nanotube/polyimide (p-MWCNT/PI) composite films is reported. Details of the fabrication process and sensing characteristics such as linearity and sensitivity are described. The electrical resistance of the p-MWCNT/PI composite film shows typical concentration percolation behavior with increasing p-MWCNT loading. At loadings beyond the percolation threshold (0.05 wt%), this sensor exhibits very good linearity with a positive slope over the entire operational RH range. The sensor has a humidity sensitivity of about 0.0047/% RH and a linearity correlation (R2) of 0.9999. A humidity sensing mechanism for the p-MWCNT/PI composite film is proposed on the basis of charge transfer between adsorbed water molecules and the p-MWCNTs.

Original languageEnglish
Pages (from-to)120-125
Number of pages6
JournalSensors and Actuators, B: Chemical
Issue number1
Publication statusPublished - 2010 Mar 4


  • Humidity sensor
  • MWCNT-polyimide composites
  • Plasma treatment

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


Dive into the research topics of 'Novel resistive-type humidity sensor based on multiwall carbon nanotube/polyimide composite films'. Together they form a unique fingerprint.

Cite this