Mesoporous WN/WO3-composite nanosheets for the chemiresistive detection of NO2 at room temperature
Name
inorganics-04-00024.pdf
Size
2.68 MB
Format
Adobe PDF
Checksum (MD5)
ff957a6733b82b1d59290ab3d0be2ba6
Author(s)
Qu, Fengdong
He, Bo
Guarecuco, Rohiverth
Yang, Minghui
Qu, Fengdong
Alternative Title
Mesoporous WN/WO[subscript 3]-composite nanosheets for the chemiresistive detection of NO[subscript 3] at room temperature
Date Issued
July 26, 2016
Journal
Inorganics
Publisher
Multidisciplinary Digital Publishing Institute
Citation
Qu, Fengdong, Bo He, Rohiverth Guarecuco, Minghui Yang, and Fengdong Qu, "Mesoporous WN/WO3-composite nanosheets for the chemiresistive detection of NO2 at room temperature." Inorganics 4, 3 (July 2016): no. 24 doi 10.3390/inorganics4030024 ©2016 Author(s)
Version
Final published version
Abstract
Composite materials, which can optimally use the advantages of different materials, have been studied extensively. Herein, hybrid tungsten nitride and oxide (WN/WO[subscript 3]) composites were prepared through a simple aqueous solution route followed by nitriding in NH[subscript 3], 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 WO[subscript 3]. The highest sensing response was up to 21.3 for 100 ppb NO[subscript 2] with a fast response time of ~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 (NO[subscript 2]: 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 WO[subscript 3] from 300 °C to room temperature, and the composites-based sensor presents good long-term stability for NO[subscript 2] of 100 ppb. Furthermore, a possible sensing mechanism is proposed. ©2016 Keywords: WN/WO3 composite; nanosheets; gas sensor; NO2; room temperature
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.3390/inorganics4030024
