Porous bimetallic Mo-W oxide nanofibers fabricated by electrospinning with enhanced acetone sensing performances

摘要

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 WO3 nanofibers. 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 degrees C, which are 2.6 and 4.2 times better than those of pure WO3 nanofibers, 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-WO3 n-n heterojunctions, high surface area and abundant porous structure as well as high surface oxygen species absorbing capability. (C) 2018 Elsevier B.V. All rights reserved.