Table of Contents
Journal of Nanoparticles
Volume 2015, Article ID 842536, 6 pages
Research Article

Ammonia Sensing by PANI-DBSA Based Gas Sensor Exploiting Kelvin Probe Technique

1CSIR-Central Electronics Engineering Research Institute, Pilani 333 031, India
2Academy of Scientific & Innovative Research (AcSIR), New Delhi 110 012, India
3Polymeric and Soft Materials Section, CSIR-National Physical Laboratory, New Delhi 110 012, India

Received 8 June 2015; Accepted 25 October 2015

Academic Editor: Raphael Schneider

Copyright © 2015 Anju Yadav et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Dodecyl benzene sulfonic acid (DBSA) doped polyaniline (PANI-DBSA) has been synthesized by chemical oxidative polymerization of aniline monomer in the presence of DBSA. The UV-visible spectroscopy and X-ray diffraction measurements confirm the formation of PANI and its doping by DBSA. SEM images show the formation of submicron size rod shaped PANI particles. A vibrating capacitor based ammonia gas sensor was prepared by spin coating PANI-DBSA film over copper (Cu) substrate. The sensor exploited Kelvin probe technique to monitor contact potential difference between PANI and Cu as a function of time and ammonia concentration. Upon exposure to 30 ppm ammonia, the sensor displays response time of 329 s, recovery time of 3600 s, and sensitivity value of 1.54 along with good repeatability.