Preparation of Yb-doped SnO2 hollow nanofibers with an enhanced ethanol–gas sensing performance by electrospinning
Preparation of Yb-doped SnO2 hollow nanofibers with an enhanced ethanol–gas sensing performance by electrospinning
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DOI：
10.1016/j.snb.2015.04.040
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发表时间：
2015-09
影响因子：
8.4
通讯作者：
T. Wang;Shuyi Ma;Liang Cheng;J. Luo;X. Jiang;W. Jin
中科院分区：
文献类型：
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作者：
T. Wang;Shuyi Ma;Liang Cheng;J. Luo;X. Jiang;W. Jin
采用单毛细管静电纺丝法，在600℃下煅烧2h，合成了纯sno2和掺yb （0.5 wt%, 1.0 wt%, 1.5 wt%）的sno2空心纳米纤维。采用x射线衍射（XRD）、能量色散x射线探测器（EDX）、扫描电镜（SEM）、透射电镜（TEM）、布鲁诺-埃米特-特勒（BET）和x射线光电子能谱（XPS）对其结构、形态和元素组成进行了研究。结果表明，sno2纳米粒子组成的空心纳米纤维成功地掺杂到sno2晶格中。最重要的是，与纯sno2中空纳米纤维相比，基于1.0 wt% yb掺杂的sno2中空纳米纤维的传感器对乙醇具有出色的选择性，高响应（在500 ppm时为170）和快速响应-恢复能力（在340°C时吸附7 s，解吸8 s）。本研究结果表明，1.0 wt%掺镱的sno2空心纳米纤维是制造有效乙醇传感器的潜在候选材料。本文讨论了中空纳米纤维的生长机理和乙醇传感机理。
Pure and Yb-doped (0.5 wt%, 1.0 wt%, 1.5 wt%) SnO2hollow 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 SnO2nanoparticles and Yb3+ions were successfully doped into the SnO2lattice. Most importantly, the sensors based on 1.0 wt% Yb-doped SnO2hollow 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 SnO2hollow nanofibers for the same ethanol concentration at 340 °C. The results obtained in this study indicate that 1.0 wt% Yb-doped SnO2hollow 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.