One-step synthesis of palladium oxide-functionalized tin dioxide nanotubes: Characterization and high nitrogen dioxide gas sensing performance at room temperature.

Author(s) Teng, L.; Liu, Y.; Ikram, M.; Liu, Z.; Ullah, M.; Ma, L.; Zhang, X.; Wu, H.; Li, L.; Shi, K.
Journal J Colloid Interface Sci
Date Published 2019 Mar 01

Mesoporous palladium oxide (PdO)-functionalized tin dioxide (SnO) composite nanotubes (SPCTs) were prepared via one-step synthesis by electrospinning technology using ethanol and N,N-dimethylformamide (DMF) as solvents. Compared with pure SnO nanotubes, there were abundant mesopores and multiheterojunctions in PdO-functionalized SnO nanotubes. The sample with the molar ratio of SnO:PdO of 100:3 (3-SPCT) exhibited excellent response (∼20.30) as a sensor with fast gas response speed (∼1.33 s) to 100 ppm nitrogen dioxide (NO) at room temperature (RT), and the detection limit reached to 10 ppb. The improved gas sensing performance of the 3-SPCT sensor was mainly attributed to the synergistic effect: the unique SnO tubular structure and well-dispersed mesopores provided the gas diffusion and adsorption channels, oxygen defects and chemisorbed oxygen were taken as the electron trap and charge transfer active sites, and a large number of heterojunctions acted as electron transport channels, thereby increasing the transfer rate.

DOI 10.1016/j.jcis.2018.11.001
ISSN 1095-7103
Citation J Colloid Interface Sci. 2019;537:7990.

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