Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 150, Issue 1, Pages 7-11Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2010.08.002
Keywords
Conducting polymer; Langmuir-Blodgett films; NH3 sensing; FTIR; UV/vis; n-Doping
Funding
- DAE-SRC [2008/21/05-BRNS]
- Prospective Research Funds [2008/38/02-BRNS]
Ask authors/readers for more resources
The polycarbazole films deposited by Langmuir-Blodgett (LB) technique exhibit a decrease in resistance on exposure to NH3, which is exactly opposite to the usual response (i.e. increase in resistance) observed for p-type conducting polymers We have investigated the mechanism of this uncharacteristic NH3 sensing behavior of polycarbazole LB films by carrying out in situ Fourier transform infrared and ultraviolet-visible absorption spectroscopy. The results are compared with electropolymerized (EP) films. It is shown that EP film is p-doped, which gets reduced by interacting with NH3, and as a result, its resistance increases On the other hand. LB film is found to be intrinsically undoped. Interaction with NH3 makes LB film n-doped, which results in a decrease of its resistance The n-doping of LB film has independently been confirmed by electrochemical reduction process (C) 2010 Elsevier B V All rights reserved
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available