H2S gas sensing properties of Fe2O3 nanoparticle-decorated NiO nanoplate sensors
| Autor: | Chongmu Lee, Sangmin Lee, Hyejoon Kheel, Seung-Bok Choi, Jae Kyung Lee, Gun-Joo Sun |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Morphology (linguistics) Scanning electron microscope Non-blocking I/O Nanoparticle chemistry.chemical_element Nanotechnology 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Oxygen 0104 chemical sciences Surfaces Coatings and Films Catalysis Adsorption Chemical engineering chemistry Materials Chemistry Molecule 0210 nano-technology |
| Zdroj: | Surface and Coatings Technology. 307:1088-1095 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2016.06.066 |
| Popis: | Fe 2 O 3 nanoparticles and Fe 2 O 3 nanoparticle-decorated NiO nanoplates were synthesized via a facile solvothermal route using FeCl 3 , nickel acetate, and NaOH as starting materials. The structure and morphology of the synthesized nanoparticles were examined using X-ray diffraction and scanning electron microscopy, respectively. The gas sensing properties of the Fe 2 O 3 nanoparticles and Fe 2 O 3 nanoparticle-decorated NiO nanoplate sensors toward H 2 S gas were examined at different concentrations of H 2 S (5–200 ppm) gas at various temperatures (200–350 °C). The Fe 2 O 3 nanoparticle-decorated NiO nanoplate sensor exhibited a stronger response to H 2 S than the Fe 2 O 3 nanoparticle sensor. The response of the Fe 2 O 3 nanoparticle-decorated NiO nanoplate sensor was 26.55 for 200 ppm H 2 S at 300 °C, whereas the maximum response of the Fe 2 O 3 nanoparticle sensor was 7.46 under the same condition. The Fe 2 O 3 nanoparticle-decorated NiO nanoplate sensor also exhibited shorter response and recovery times than those of the Fe 2 O 3 nanoparticle sensor. The improved sensing performance of the Fe 2 O 3 nanoparticle-decorated NiO nanoplate sensor was attributed to the enhanced modulation of the conduction channel width and potential barrier height at the NiO–Fe 2 O 3 interface, catalytic activity of NiO in the oxidation of H 2 S, larger surface-to-volume ratio of the decorated sensor, and stronger adsorption of oxygen molecules by p-type NiO. |
| Databáze: | OpenAIRE |
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