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

doi:10.1016/j.snb.2009.11.041

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 journal › Article › peer-review

207 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 language	English
Pages (from-to)	120-125
Number of pages	6
Journal	Sensors and Actuators, B: Chemical
Volume	145
Issue number	1
DOIs	https://doi.org/10.1016/j.snb.2009.11.041
Publication status	Published - 2010 Mar 4

Keywords

Humidity sensor
MWCNT
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

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10.1016/j.snb.2009.11.041

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title = "Novel resistive-type humidity sensor based on multiwall carbon nanotube/polyimide composite films",

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.",

keywords = "Humidity sensor, MWCNT, MWCNT-polyimide composites, Plasma treatment",

author = "Yoo, {Kum Pyo} and Lim, {Lee Taek} and Min, {Nam Ki} and Lee, {Myung Jin} and Lee, {Chul Jin} and Park, {Chan Won}",

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AU - Yoo, Kum Pyo

AU - Lim, Lee Taek

AU - Min, Nam Ki

AU - Lee, Myung Jin

AU - Lee, Chul Jin

AU - Park, Chan Won

PY - 2010/3/4

Y1 - 2010/3/4

N2 - 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.

AB - 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.

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KW - MWCNT

KW - MWCNT-polyimide composites

KW - Plasma treatment

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

Abstract

Keywords

ASJC Scopus subject areas

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