Doped-ZnO nanoparticles for selective gas sensors
| Autor: | Giovanni Neri, R. Dhahri, N. Zahmouli, Mokhtar Hjiri, L. El Mir, Salvatore Leonardi |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Doping Nanoparticle Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Atomic and Molecular Physics and Optics Supercritical fluid 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry.chemical_compound Chemical engineering chemistry Transmission electron microscopy Phase (matter) Screen printing Electrical and Electronic Engineering 0210 nano-technology Carbon monoxide |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 28:9667-9674 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-017-6717-9 |
| Popis: | Pure ZnO, Al3%- and Ca5%-doped ZnO nanoparticles have been synthesized by the sol–gel process under supercritical dry conditions of ethanol. The obtained nanopowders were annealed at 400 °C for 2 h in air in order to stabilize their microstructure and characterized by X-ray diffraction analysis (XRD) and transmission electron microscopy (TEM). XRD demonstrated that the nanoparticles of pure and doped samples are constituted by ZnO as the primary phase. TEM images showed particles of irregular form having a broad particles size distribution. Conductometric ZnO sensors were fabricated by depositing the synthesized nanopowders on alumina substrates by screen printing technique and tested in the monitoring of environmental toxic carbon oxides, i.e. CO and CO2. Al-doped ZnO sensor showed high response towards carbon monoxide CO, while the Ca-doped sensor showed a good response to CO2, operating at the temperature of 300 and 450 °C, respectively. Both sensors are characterized by a good selectivity towards the target gas and fast response/recovery time. In order to decrease the operating temperature of Ca5%-doped sensor, co-doping by adding Al3% was also proposed. |
| Databáze: | OpenAIRE |
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