Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 182, Issue -, Pages 300-306Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.03.008
Keywords
Poly(aniline); Poly(ethyleneimine); Conductive sensor; Formaldehyde
Funding
- Richmond Center of Excellence of the American Academy of Pediatrics
- Flight Attendants Medical Research Institute
- Norris Cotton Cancer Center at Dartmouth Hitchcock Medical Center
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We have developed conductive elements incorporating thin poly(aniline)/poly(ethyleneimine) composite films prepared by spin casting and report on their characteristics for formaldehyde detection via changes in conductivity. We find significant increases in the resistance, for example greater than 10 k Omega at a concentration of 38 ppm exposed for 1 min, of these films upon exposure to formaldehyde vapor in a laboratory gaseous exposure chamber. The films are less responsive to other volatile organic vapors, such as methanol, acetone and dichloromethane. The morphology of the films was analyzed by scanning electron microscopy, which indicated a porous surface well suited to vapor phase adsorption. (C) 2013 Elsevier B.V. All rights reserved.
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