Low-concentration ammonia gas sensing using polyaniline nanofiber thin film grown by rapid polymerization technique

A thin film of polyaniline (PANI) nanofiber was synthesized by a simple and inexpensive rapid chemical polymerization technique on glass substrate at room temperature. The fundamental peaks that appeared in the absorbance, transmittance, and Fourier transform infrared spectroscopy (FTIR) spectra con...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2022-10, Vol.33 (29), p.23016-23029
Main Authors: Upadhye, Deepak S., Dive, Avinash S., Birajadar, Ravikiran B., Bagul, Sagar B., Gattu, Ketan P., Sharma, Ramphal
Format: Article
Language:English
Subjects:
Ammonia
Characterization and Evaluation of Materials
Chemistry and Materials Science
Emission analysis
Field emission microscopy
Fourier transforms
Gas sensors
Glass substrates
Infrared spectra
Materials Science
Nanofibers
Optical and Electronic Materials
Polyanilines
Polymerization
Response time
Room temperature
Spectrum analysis
Thin films
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Summary:A thin film of polyaniline (PANI) nanofiber was synthesized by a simple and inexpensive rapid chemical polymerization technique on glass substrate at room temperature. The fundamental peaks that appeared in the absorbance, transmittance, and Fourier transform infrared spectroscopy (FTIR) spectra confirmed the formation of polyaniline salt thin film. The surface morphology investigation was done by field emission scanning electron microscopy (FESEM), which showed cylindrical fibers with an average diameter of ~ 59 nm on the entire surface. The XRD pattern of polyaniline nanofiber shows amorphous nature. The gas sensing properties of polyaniline nanofiber thin films were investigated using a Keithley 2400 I–V (± 2 V) sourcemeter interfaced with a computer system, in presence of 0.25–2 ppm and 25–250 ppm in the dry ammonia gas at room temperature. Polyaniline nanofibers show a noticeable response for lower gas concentration, i.e., 0.25–2 ppm of ammonia with response time of ~ 63 s and stability of 19 days. The higher detection limit of the polyaniline nanofiber-based sensor was observed to be 100 ppm with a response of 92% for ammonia gas.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-022-09069-w