Citation: Li Tingting, Shen Yanbai, Zhao Sikai, Zhou Pengfei, Zhong Xiangxi, Gao Shuling, Wei Dezhou, Meng Fanli. Synthesis and in-situ noble metal modification of WO₃·0.33H₂O nanorods from a tungsten-containing mineral for enhancing NH₃ sensing performance[J]. Chinese Chemical Letters, ;2020, 31(8): 2037-2040. doi: 10.1016/j.cclet.2020.01.024 shu

Synthesis and in-situ noble metal modification of WO₃·0.33H₂O nanorods from a tungsten-containing mineral for enhancing NH₃ sensing performance

Li Tingting ^a ,
Shen Yanbai ^a,c,*, ,
Zhao Sikai ^a ,
Zhou Pengfei ^a ,
Zhong Xiangxi ^a ,
Gao Shuling ^a,*, ,
Wei Dezhou ^a ,
Meng Fanli ^b

a.
School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
b.
School of Information Science and Engineering, Northeastern University, Shenyang 110819, China
c.
State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, China

shenyanbai@mail.neu.edu.cn

gaoshuling@mail.neu.edu.cn

Received Date: 19 December 2019
Revised Date: 7 January 2020
Accepted Date: 9 January 2020
Available Online: 9 January 2020

Figures(3)

Ag- and Pt-doped WO₃·0.33H₂O nanorods with high response and selectivity to NH₃ were synthesized from a tungsten-containing mineral of scheelite concentrate by a simple combined process, namely by a high pressure leaching method to obtain tungstate ions-containing leaching solution and followed by a hydrothermal method to prepare corresponding nanorods. The microstructure and NH₃ sensing performance of the final products were investigated systematically. The microstructure characterization showed that the as-prepared WO₃·0.33H₂O nanorods had a hexagonal crystal structure, and Ag and Pt nanoparticles were uniformly distributed in the WO₃·0.33H₂O nanorods. Gas sensing measurements indicated that Ag and Pt nanoparticles not only could obviously enhance NH₃ sensing properties in terms of response, selectivity as well as response/recovery time, but also could reduce the optimal operating temperature at which the highest response was achieved. The highest responses of 22.4 and 47.6 for Ag- and Pt-doped WO₃·0.33H₂O nanorods to 1000 ppm NH₃ were obtained at 225 and 175 ℃, respectively, which were about four and eight folds higher than that of pure one at 250 ℃. The superior NH₃ sensing properties are mainly ascribed to the catalytic activities of noble metals and the different work functions between noble metals and WO₃·0.33H₂O.
- Scheelite concentrate,
- Noble metal doping,
- WO₃·0.33H₂O nanorods,
- NH₃,
- Sensing mechanism
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Synthesis and in-situ noble metal modification of WO3·0.33H2O nanorods from a tungsten-containing mineral for enhancing NH3 sensing performance

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通讯作者: 陈斌, bchen63@163.com

Synthesis and in-situ noble metal modification of WO₃·0.33H₂O nanorods from a tungsten-containing mineral for enhancing NH₃ sensing performance