Visible light activation of room temperature NO 2 gas sensors based on ZnO, SnO 2 and In 2 O 3 sensitized with CdSe quantum dots
| Autor: | K. A. Drozdov, Alexander Gaskov, A.S. Chizhov, Marina Rumyantseva, Roman B. Vasiliev, Olesia M. Karakulina, Artem M. Abakumov, A.V. Marchevsky, D. G. Filatova, I. V. Krylov |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Cadmium selenide Tin dioxide business.industry Metals and Alloys 02 engineering and technology Surfaces and Interfaces Green-light 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Acceptor Nanocrystalline material 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Quantum dot Desorption Materials Chemistry Optoelectronics 0210 nano-technology business Visible spectrum |
| Zdroj: | Thin Solid Films. 618:253-262 |
| ISSN: | 0040-6090 |
| DOI: | 10.1016/j.tsf.2016.09.029 |
| Popis: | This work reports the analysis of visible light activation of room temperature NO2 gas sensitivity of metal oxide semiconductors (MOS): blank and CdSe quantum dots (QDs) sensitized nanocrystalline matrixes ZnO, SnO2 and In2O3. Nanocrystalline metal oxides (MOx) ZnO, SnO2, In2O3 were synthesized by the precipitation method. Colloidal CdSe QDs were obtained by high temperature colloidal synthesis. Sensitization was effectuated by direct adsorption of CdSe QDs stabilized with oleic acid on MOx surface. The role of illumination consists in generation of electrons, which can be transferred into MOx conduction band, and holes that can recombine with the electrons previously trapped by the chemisorbed acceptor species and thus activate desorption of analyte molecules. Under green light illumination for blank SnO2 and In2O3 matrixes the indirect consequential mechanism for the generation of holes is proposed. Another mechanism is realized in the presence of CdSe QDs. In this case the electron-hole pair is generated in the CdSe quantum dot. Sensor measurements demonstrated that synthesized materials can be used for NO2 detection under visible (green) light illumination at room temperature without any thermal heating. |
| Databáze: | OpenAIRE |
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