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Highly sensitive and selective PAni-CeO2 nanohybrid for detection of NH3 biomarker at room temperature
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Highly sensitive and selective PAni-CeO2 nanohybrid for detection of NH3 biomarker at room temperature
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Journal Article
Highly sensitive and selective PAni-CeO2 nanohybrid for detection of NH3 biomarker at room temperature
2023
Overview
An impressive room temperature (25 °C) NH
3
biomarker sensor has been developed using polyaniline (PAni)-CeO
2
nanohybrid by facile oxidative polymerization process on glass substrates. The structural properties of PAni-CeO
2
nanohybrids were disclosed using X-ray diffractometry, and the surface morphology was studied using field emission scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy techniques. The PAni-CeO
2
nanohybrids shows cubic crystal structure with strongly interconnected nanofiber surface morphology. The chemiresistive gas sensing performance of the PAni-CeO
2
nanohybrid sensor reveals that the CeO
2
nanoparticles (NPs) have a significant impact on the hybrid sensor. The CeO
2
NPs in the PAni-CeO
2
nanohybrid might block the charge carriers or reduce the delocalization length and hence increase the resistance of the nanohybrid when exposed to NH
3
gas. PAni-CeO
2
(50 wt%) nanohybrid sensor exhibits (80%) response toward 100 ppm NH
3
which is about four-fold higher than pristine PAni (26.70%), showing excellent stability (78.75%), admirable reproducibility with least response time (9.31 s), and such an excellent performance could be imputed to a high explicit surface area of CeO
2
for significant chemical interaction and the formation of interfacial heterojunction bond with CeO
2
, exploring PAni-CeO
2
(50 wt%) nanohybrid as a potential candidate for biomarker NH
3
detection. An impedance spectroscopy was used to investigate the interaction mechanism between the NH
3
gas and the PAni-CeO
2
nanohybrid sensor.
Publisher
Springer US,Springer Nature B.V
