Preparation of Yb-doped SnO2 hollow nanofibers with an enhanced ethanol–gas sensing performance by electrospinning
2015; Elsevier BV; Volume: 216; Linguagem: Inglês
10.1016/j.snb.2015.04.040
ISSN1873-3077
AutoresT.T. Wang, Shuyi Ma, Liang Cheng, Jing Luo, Xinhui Jiang, Wei Jin,
Tópico(s)Analytical Chemistry and Sensors
ResumoPure and Yb-doped (0.5 wt%, 1.0 wt%, 1.5 wt%) SnO2 hollow nanofibers were synthesized by single capillary electrospinning followed by calcination at 600 °C for 2 h. The structural, morphological and elemental composition were investigated by X-ray diffraction (XRD), energy-dispersive X-ray detector (EDX), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) and X-ray photoelectron spectroscopy (XPS). The results showed that the hollow nanofibers were composed of SnO2 nanoparticles and Yb3+ ions were successfully doped into the SnO2 lattice. Most importantly, the sensors based on 1.0 wt% Yb-doped SnO2 hollow nanofibers exhibited perfect sensing performance toward ethanol with excellent selectivity, high response (170 for 500 ppm) and fast response-recovery capability (7 s for adsorption and 8 s for desorption) compared to pure SnO2 hollow nanofibers for the same ethanol concentration at 340 °C. The results obtained in this study indicate that 1.0 wt% Yb-doped SnO2 hollow nanofibers are potential candidates for fabricating effective ethanol sensors. The growth mechanism and the ethanol sensing mechanism of the hollow nanofibers were discussed in this paper.
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