Benzene sensing properties and sensing mechanism of Pd-decorated Bi2O3-core/ZnO-shell nanorods
| Autor: | Gun-Joo Sun, Jae Kyung Lee, Chongmu Lee, Sangmin Lee, Tae-Kyung Ko, Maryam Bonyani |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Annealing (metallurgy) Scanning electron microscope Metals and Alloys chemistry.chemical_element Nanotechnology 02 engineering and technology Surfaces and Interfaces Zinc 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Atomic layer deposition chemistry Chemical engineering Transmission electron microscopy Materials Chemistry Nanorod 0210 nano-technology Benzene Carbon monoxide |
| Zdroj: | Thin Solid Films. 636:257-266 |
| ISSN: | 0040-6090 |
| DOI: | 10.1016/j.tsf.2017.05.051 |
| Popis: | We report the effects of a combination of Pd-decoration and Bi 2 O 3 -ZnO core-shell formation on the response of the Bi 2 O 3 nanorod gas sensor to benzene. Pd-decorated Bi 2 O 3 –ZnO core–shell nanorods were synthesized by a four-step process including thermal evaporation of Bi powders in an oxygen atmosphere, atomic layer deposition of ZnO, and Pd decoration, followed by high-temperature annealing. The formation of Pd-decorated Bi 2 O 3 –ZnO core–shell nanorods was confirmed by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and energy-dispersive spectrometric elemental mapping. The Pd-decorated Bi 2 O 3 –ZnO core–shell nanorod sensor showed far stronger response to benzene improved compared to those of the Bi 2 O 3 –ZnO core–shell nanorod and Pd-decorated ZnO nanorod sensors. The Pd-decorated Bi 2 O 3 –ZnO core–shell nanorod sensor exhibited a response ( R a /R g ) of 28.0 to 200 ppm of benzene at 300 °C, whereas those of the Bi 2 O 3 –ZnO core–shell nanorod, and Pd-decorated ZnO nanorod sensors were 9.1 and 8.3, respectively. The extraordinarily strong response of the Pd-decorated Bi 2 O 3 –ZnO core–shell nanorod sensor compared to other sensors might be attributed to the intensified potential barrier modulation at the Bi 2 O 3 –ZnO interface due to the Pd-induced enhanced generation of electrons. The Pd-decorated Bi 2 O 3 –ZnO core–shell nanorod sensor also showed very good selectivity toward benzene against other reducing gases, such as ethanol, toluene, carbon monoxide, and acetone. |
| Databáze: | OpenAIRE |
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