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Microwave-Assisted Synthesis of Graphene–SnO2 Nanocomposites and Their Applications in Gas Sensors
- Source :
- ACS Applied Materials & Interfaces. 9:31667-31682
- Publication Year :
- 2017
- Publisher :
- American Chemical Society (ACS), 2017.
-
Abstract
- We obtained extremely high and selective sensitivity to NO2 gas by fabricating graphene–SnO2 nanocomposites using a commercial microwave oven. Structural characterization revealed that the products corresponded to agglomerated structures of graphene and SnO2 particles, with small secondary SnOx (x ≤ 2) nanoparticles deposited on the surfaces. The overall oxygen atomic ratio was decreased with the appearance of an SnOx (x < 2) phase. By the microwave treatment of graphene–SnO2 nanocomposites, with the graphene promoting efficient transport of the microwave energy, evaporation and redeposition of SnOx nanoparticles were facilitated. The graphene–SnO2 nanocomposites exhibited a high sensor response of 24.7 for 1 ppm of NO2 gas, at an optimized temperature of 150 °C. The graphene–SnO2 nanocomposites were selectively sensitive to NO2 gas, in comparison with SO2, NH3, and ethanol gases. We suggest that the generation of SnOx nanoparticles and the SnOx phase in the matrix results in the formation of SnO2/SnO2 ho...
- Subjects :
- Nanocomposite
Materials science
Graphene
Microwave oven
Nanoparticle
Nanotechnology
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Evaporation (deposition)
0104 chemical sciences
law.invention
Chemical engineering
law
Phase (matter)
General Materials Science
Atomic ratio
0210 nano-technology
Microwave
Subjects
Details
- ISSN :
- 19448252 and 19448244
- Volume :
- 9
- Database :
- OpenAIRE
- Journal :
- ACS Applied Materials & Interfaces
- Accession number :
- edsair.doi...........94f2faa97c47aec8c88abebfb20daeea