Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 134, Issue 2, Pages 373-376Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.05.009
Keywords
Polyaniline; Hexagonal structure; Ammonia; Camphorsulphonic acid; Room temperature sensing
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A polyamiline (Pani) thin film doped with camphorsulfonic acid (CSA) has been deposited using spin coating technique on a glass substrate. Polyaniline is chemically synthesized by an oxidation method at similar to 0 degrees C. Sensing experiments are performed on the Pani-CSA thin film with the injection of 50,100,150 and 200 ppm level NH3 at room temperature. The change in resistance, based on the modification of doping level, occurs due to redox interaction of the analyte. Response and recovery times are found to be similar to 1 s and similar to 7 min, respectively. The hexagonal structure seen in the scanning electron micrograph is helpful in making the sensor response fast. (C) 2008 Elsevier B.V. All rights reserved.
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