Nitrogen dioxide vapor detection using poly- o-toluidine

We describe a flexible, lightweight, reversible NO 2 vapor sensor based on resistance changes of a thin film of a doped conducting polymer, poly- o-toluidine, deposited on plastic substrates. Unlike the irreversible signals typically observed in organic films, signal reversibility in the concentrati...

Full description

Saved in:
Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2009-12, Vol.143 (1), p.454-457
Main Authors: Surwade, Sumedh P., Agnihotra, Srikanth Rao, Dua, Vineet, Manohar, Sanjeev K.
Format: Article
Language:English
Subjects:
Chain conformation
Chemiresistor
Poly- o-toluidine
Sensor
Solvatochromism
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We describe a flexible, lightweight, reversible NO 2 vapor sensor based on resistance changes of a thin film of a doped conducting polymer, poly- o-toluidine, deposited on plastic substrates. Unlike the irreversible signals typically observed in organic films, signal reversibility in the concentration range 100–10 ppm is readily achieved using a short burst of UV irradiation at room temperature in ambient air without the aid of heating or pump down cycles. Interestingly, signal response is dependent on the organic solvent used to cast the polymer film with dipolar aprotic solvents yielding films showing a strong response. There are striking differences in electrical and electronic properties including morphology of films cast from different solvents. This phenomenon is traced to polymer chain conformation in solution that is preserved in the solid state (cast film) which opens a new structural vector to tailor sensor response and selectivity. This study also expands the use of conducting polymers for the detection of vapors that were previously believed to be chemically too aggressive.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2009.09.033