Mesoporous WN/WO3-Composite Nanosheets for the Chemiresistive Detection of NO2 at Room Temperature

被引:9
作者
Qu, Fengdong [1 ]
He, Bo [1 ]
Guarecuco, Rohiverth [2 ]
Yang, Minghui [1 ]
机构
[1] Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
[2] MIT, Dept Chem Engn, Cambridge, MA 02139 USA
基金
中国国家自然科学基金;
关键词
WN/WO3; composite; nanosheets; gas sensor; NO2; room temperature;
D O I
10.3390/inorganics4030024
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Composite materials, which can optimally use the advantages of different materials, have been studied extensively. Herein, hybrid tungsten nitride and oxide (WN/WO3) composites were prepared through a simple aqueous solution route followed by nitriding in NH3, for application as novel sensing materials. We found that the introduction of WN can improve the electrical properties of the composites, thus improving the gas sensing properties of the composites when compared with bare WO3. The highest sensing response was up to 21.3 for 100 ppb NO2 with a fast response time of similar to 50 s at room temperature, and the low detection limit was 1.28 ppb, which is far below the level that is immediately dangerous to life or health (IDLH) values (NO2: 20 ppm) defined by the U.S. National Institute for Occupational Safety and Health (NIOSH). In addition, the composites successfully lower the optimum temperature of WO3 from 300 degrees C to room temperature, and the composites-based sensor presents good long-term stability for NO2 of 100 ppb. Furthermore, a possible sensing mechanism is proposed.
引用
收藏
页数:10
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