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

Anju Yadav | Zendy; Ajay Agarwal | Zendy; Pankaj Agarwal | Zendy; Parveen Saini | Zendy

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

Author(s) -

Anju Yadav,

Ajay Agarwal,

Pankaj Agarwal,

Parveen Saini

Publication year - 2015

Publication title -

journal of nanoparticles

Language(s) - English

Resource type - Journals

eISSN - 2314-4858

pISSN - 2314-484X

DOI - 10.1155/2015/842536

Subject(s) - polyaniline , materials science , conductive polymer , aniline , polymerization , kelvin probe force microscope , sulfonic acid , chemical engineering , monomer , doping , ammonia , polymer chemistry , polymer , nanotechnology , composite material , organic chemistry , optoelectronics , chemistry , atomic force microscopy , engineering

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

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