Journal
JOURNAL OF APPLIED PHYSICS
Volume 127, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5113847
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Funding
- UGC New Delhi, India [F.30-359/2017 (BSR), F1.17.1/2016-17/MANF-2015-17-MAD-50897, UGC-BSRF-Physics-03/RPS/RO/JMI/2015]
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This paper presents a two-step enhancement and a comprehensive analysis of single-walled carbon nanotubes (SWCNTs) wrapped polyaniline nanofiber (NPANI) ammonia (NH3) gas sensor at room temperature. SWCNT-PANI composites are successfully synthesized using an efficient and cost-effective rapid in situ chemical polymerization method. The structural morphology and modification of the samples are characterized using field-emission scanning electron microscopy and HRTEM. FTIR and Raman spectroscopic studies are also performed to gain a better insight into the chemical environmental interaction in the as-prepared nanocomposite. The analysis confirms the successful formation of the nanocomposite. The observed NH3 gas-sensing response at 10 ppm of SWCNT, f-SWCNT (functionalised SWCNT), and SWCNT-PANI composite sensors are 5%-6%, 18%-20%, and 24%-25%, respectively. The SWCNT-PANI composite sensors have shown higher repeatability, selectivity, long-term stability, and fast response-recovery characteristics as compared to f-SWCNTs and pristine SWCNT sensors. Concentration and temperature dependent gas-sensing studies are also analyzed. The sensor response also shows a linear relationship with NH3 gas concentration and an inverse relationship with increasing temperature. Published under license by AIP Publishing.
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