Highly sensitive and selective PAni-CeO2 nanohybrid for detection of NH3 biomarker at room temperature.

Autor: Dhanawade, Reshma N., Pawar, Nanasaheb S., Chougule, Manik A., Hingangavkar, Gajanan M., Jadhav, Yogesh M., Nimbalkar, Tanaji M., Navale, Yuvraj H., Chavan, Ganesh T., Jeon, Chan-Wook, Patil, Vikas B.
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Zdroj: Journal of Materials Science: Materials in Electronics; Mar2023, Vol. 34 Issue 9, p1-18, 18p
Abstrakt: An impressive room temperature (25 °C) NH3 biomarker sensor has been developed using polyaniline (PAni)-CeO2 nanohybrid by facile oxidative polymerization process on glass substrates. The structural properties of PAni-CeO2 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-CeO2 nanohybrids shows cubic crystal structure with strongly interconnected nanofiber surface morphology. The chemiresistive gas sensing performance of the PAni-CeO2 nanohybrid sensor reveals that the CeO2 nanoparticles (NPs) have a significant impact on the hybrid sensor. The CeO2 NPs in the PAni-CeO2 nanohybrid might block the charge carriers or reduce the delocalization length and hence increase the resistance of the nanohybrid when exposed to NH3 gas. PAni-CeO2 (50 wt%) nanohybrid sensor exhibits (80%) response toward 100 ppm NH3 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 CeO2 for significant chemical interaction and the formation of interfacial heterojunction bond with CeO2, exploring PAni-CeO2 (50 wt%) nanohybrid as a potential candidate for biomarker NH3 detection. An impedance spectroscopy was used to investigate the interaction mechanism between the NH3 gas and the PAni-CeO2 nanohybrid sensor. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index