Morphology of Ga2O3 Nanowires and Their Sensitivity to Volatile Organic Compounds
| Autor: | Patrycja Suchorska-Woźniak, Rafal Szukiewicz, Maciej Krawczyk, Helena Teterycz, R. Korbutowicz, Maciej Kuchowicz |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
General Chemical Engineering Nanowire chemistry.chemical_element acetone 02 engineering and technology Conductivity 010402 general chemistry 01 natural sciences Article Nanomaterials chemiresistors lcsh:Chemistry gallium oxide thermal synthesis Specific surface area volatile organic compounds General Materials Science Gallium nanomaterials Atmospheric pressure metal oxide 021001 nanoscience & nanotechnology chemical gas sensors 0104 chemical sciences chemistry Chemical engineering nanowires lcsh:QD1-999 Transmission electron microscopy Electrode ethanol 0210 nano-technology |
| Zdroj: | Nanomaterials, Vol 11, Iss 456, p 456 (2021) Nanomaterials Volume 11 Issue 2 |
| ISSN: | 2079-4991 |
| Popis: | Gas sensitive structures made of nanowires exhibit extremally large specific surface area, and a great number of chemically active centres that can react with the ambient atmosphere. This makes the use of nanomaterials promising for super sensitive gas sensor applications. Monoclinic β-Ga2O3 nanowires (NWs) were synthesized from metallic gallium at atmospheric pressure in the presence of nitrogen and water vapor. The nanowires were grown directly on interdigitated gold electrodes screen printed on Al2O3 substrates, which constituted the gas sensor structure. The observations made with transmission electron microscope (TEM) have shown that the nanowires are monocrystalline and their diameters vary from 80 to 300 nm with the average value of approximately 170 nm. Au droplets were found to be anchored at the tips of the nanowires which may indicate that the nanowires followed the Vapor–Liquid–Solid (VLS) mechanism of growth. The conductivity of β-Ga2O3 NWs increases in the presence of volatile organic compounds (VOC) even in the temperature below 600 °C. The gas sensor based on the synthesized β-Ga2O3 NWs shows peak sensitivity to 100 ppm of ethanol of 75.1 at 760 °C, while peak sensitivity to 100 ppm of acetone is 27.5 at 690 °C. |
| Databáze: | OpenAIRE |
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