Facile synthesis and NO2 gas sensing of tungsten oxide nanorods assembled microspheres

被引:142
作者
Liu, Zhifu [1 ]
Miyauchi, Masashio [1 ]
Yamazaki, Toshinari [2 ]
Shen, Yanbai [2 ]
机构
[1] Natl Inst Adv Ind Sci & Technol, Nonotechnol Res Inst, Tsukuba, Ibaraki 3058565, Japan
[2] Toyama Univ, Sch Engn, Toyama 9308555, Japan
关键词
Tungsten oxide; Microsphere; Nanorod; NO2; Gas sensor; LIGHT-DRIVEN PHOTOCATALYSTS; THIN-FILMS; SEMICONDUCTOR SENSOR; NITROGEN-OXIDES; WO3; NANOWIRES; SENSITIVITY; SIZE; NANOSTRUCTURES; FABRICATION;
D O I
10.1016/j.snb.2009.04.059
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Tungsten oxide nanorods assembled microspheres were synthesized by a facile hydrothermal process at 180 degrees C using ammonium metatungstate and oxalic acid as starting materials. The morphology and structural properties were investigated using scanning electron microscopy. powder X-ray diffraction, and transmission electron microscopy. The as-synthesized microspheres are composed of orthorhombic WO3 center dot xH(2)O nanorods with diameter less than 100 nm. These microspheres lose water gradually during annealing and transfer to monoclinic WO3 when annealed at 550 degrees C. The gas sensing properties of the microspheres annealed at different temperatures were studied by exposing the gas sensors made from microspheres to NO2 gas. The results indicated that the crystalline phase of the microspheres has no obvious effect on the gas sensing performance. The microspheres annealed at 350 degrees C showed fast and the highest response to NO2 gas due to the three-dimensional network based on the nanorods and the high effective surface area. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:514 / 519
页数:6
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