Synthesis, Characterization, and Study of NO2 Gas Sensing Behavior of CSA Doped PANi-Ta2O5 Nanocomposite

Polyaniline in its emeraldine salt form was obtained by chemical oxidative polymerization of aniline monomer. PANi thus obtained was mixed with tantalum pentoxide (Ta 2 O 5 ) nano powder in 50 wt% to get PANi-Ta 2 O 5 nanocomposite. The nanocomposite was further mixed with Camphor Sulphonic Acid (CS...

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Bibliographic Details
Published in:IEEE sensors journal 2020-04, Vol.20 (7), p.3429-3441
Main Authors: Bora Patowary, Bornali, Laskar, Shakuntala, Narzary, Rewrewa, Mondal, Arunendu
Format: Article
Language:English
Subjects:
Aniline
Camphor
Characterization
chemical synthesis
conducting polymer
Detection
Doping
Gas detectors
Gas sensors
Humidity
humidity-insensitive
Morphology
Nanocomposites
Nitrogen dioxide
PANi nanocomposite
Polyanilines
Recovery time
Relative humidity
Response time
Room temperature
Selectivity
Sensitivity
Sensor phenomena and characterization
sensor response
Sensors
Tantalum
Tantalum oxides
Temperature
Temperature sensors
Thermal stability
Thin films
thin-film
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Summary:Polyaniline in its emeraldine salt form was obtained by chemical oxidative polymerization of aniline monomer. PANi thus obtained was mixed with tantalum pentoxide (Ta 2 O 5 ) nano powder in 50 wt% to get PANi-Ta 2 O 5 nanocomposite. The nanocomposite was further mixed with Camphor Sulphonic Acid (CSA) with concentrations of 20wt%, 30wt% and 40wt% respectively for solid-state doping. All the samples were characterized by FESEM, TEM, XRD, FTIR and UV-Vis spectroscopy. Thin film sensor device was developed taking each of the samples as the sensing material to study the gas sensing properties towards NO 2 gas at room temperature. The CSA doped nanocomposite possessed highly aggregated globular morphology that led to high surface area. Doping of CSA notably favored the gas sensing process. PANi-Ta 2 O 5 -CSA40wt% exhibited the best performance with sensor response above 80% towards 500 ppm NO 2 , a faster response time of 55 seconds and a recovery time of 160 seconds. The device showed good repeatability and high selectivity to NO 2 . The sensor response was studied under 38%, 57% and 65% relative humidity conditions respectively and it was found to remain stable under different humidity levels.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2019.2959435