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, Cheol Jin Lee, Chan Won Park

Research output: Contribution to journalArticle

125 Citations (Scopus)

Abstract

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
Volume145
Issue number1
DOIs
Publication statusPublished - 2010 Mar 4

Fingerprint

Humidity sensors
Carbon Nanotubes
Composite films
polyimides
Polyimides
humidity
Carbon nanotubes
Atmospheric humidity
carbon nanotubes
composite materials
sensors
linearity
Plasmas
Acoustic impedance
sensitivity
Sensors
electrical resistance
Charge transfer
charge transfer
slopes

Keywords

  • Humidity sensor
  • MWCNT
  • MWCNT-polyimide composites
  • Plasma treatment

ASJC Scopus subject areas

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

Cite this

Novel resistive-type humidity sensor based on multiwall carbon nanotube/polyimide composite films. / Yoo, Kum Pyo; Lim, Lee Taek; Min, Nam Ki; Lee, Myung Jin; Lee, Cheol Jin; Park, Chan Won.

In: Sensors and Actuators, B: Chemical, Vol. 145, No. 1, 04.03.2010, p. 120-125.

Research output: Contribution to journalArticle

Yoo, Kum Pyo ; Lim, Lee Taek ; Min, Nam Ki ; Lee, Myung Jin ; Lee, Cheol Jin ; Park, Chan Won. / Novel resistive-type humidity sensor based on multiwall carbon nanotube/polyimide composite films. In: Sensors and Actuators, B: Chemical. 2010 ; Vol. 145, No. 1. pp. 120-125.
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