Porous bimetallic Mo-W oxide nanofibers fabricated by electrospinning with enhanced acetone sensing performances
Porous bimetallic Mo-W oxide nanofibers fabricated by electrospinning with enhanced acetone sensing performances
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静电纺丝制备的多孔双金属Mo-W氧化物纳米纤维具有增强的丙酮传感性能
DOI：
10.1016/j.jallcom.2018.11.269
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发表时间：
2019-03
影响因子：
6.2
通讯作者：
He Ze
中科院分区：
文献类型：
--
作者：
Zhang Jinniu;Lu Huan;Lu Hongbing;Li Gang;Gao Jianzhi;Yang Zhibo;Tian Yonghong;Zhang Min;Wang Chunlan;He Ze
采用静电纺丝法制备了不同Mo/W摩尔比的多孔MoO 3-WO 3纳米纤维。通过调节Mo/W的摩尔比，可以合理地调节Mo-W氧化物纳米纤维的组成、比表面积、孔隙率以及氧物种吸收能力。结果表明，Mo-W氧化物纳米纤维对丙酮的敏感性能明显优于纯WO 3纳米纤维。Mo/W摩尔比为6%的Mo-W氧化物纳米纤维具有最佳的传感性能，在375 °C下对100 ppm丙酮的最高响应为26.5，最低检测限为19.2 ppb，分别是纯WO 3纳米纤维的2.6倍和4.2倍。此外，Mo-W氧化物纳米纤维还表现出良好的丙酮选择性和稳定性。6 mol% Mo-W氧化物纳米纤维的丙酮性能的提高主要归因于多种因素的协同作用，包括大量MoO 3-WO 3 n-n异质结的产生、高的比表面积和丰富的多孔结构以及高的表面氧物种吸收能力。
Porous bimetallic Mo-W oxide (MoO3-WO3) nanofibers with different Mo/W molar ratios have been prepared via a simple electrospinning approach. The composition, surface area, porosity, as well as oxygen species absorbing capability of the bimetallic Mo-W oxide nanofibers can be reasonably tuned through the modulation of Mo/W molar ratios. The sensing results show that the Mo-W oxide nanofibers exhibit much better acetone sensing properties compared with pure WO3nanofibers. The best sensing properties are found for Mo-W oxide nanofibers with 6% Mo/W molar ratio, showing the highest response of 26.5 towards 100 ppm acetone and the lowest detection limit of 19.2 ppb at 375 °C, which are 2.6 and 4.2 times better than those of pure WO3nanofibers, respectively. Moreover, the Mo-W oxide nanofibers also exhibit good acetone selectivity and stability. The enhanced acetone performances of 6 mol% bimetallic Mo-W oxide nanofibers can be mainly ascribed to the synergetic effects of several factors including the generation of numerous MoO3-WO3n-n heterojunctions, high surface area and abundant porous structure as well as high surface oxygen species absorbing capability.
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