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Novel resistive-type humidity sensor based on multiwall carbon nanotube/polyimide composite films
- Issue Date
- 4-3월-2010
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- MWCNT; MWCNT-polyimide composites; Plasma treatment; Humidity sensor
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, v.145, no.1, pp.120 - 125
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS AND ACTUATORS B-CHEMICAL
- Volume
- 145
- Number
- 1
- Start Page
- 120
- End Page
- 125
- ISSN
- 0925-4005
- 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 0.00471% RH and a linearity correlation (R-2) 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. (C) 2009 Elsevier B.V. All rights reserved.
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