Hydrogen Gas Sensing Characteristics of Nanostructured NiO Thin Films Synthesized by SILAR Method
| Autor: | Selim Acar, Aytunç Ateş, Irmak Karaduman, Tuğba Çorlu, Memet Ali Yıldırım |
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| Přispěvatelé: | EBYÜ, Mühendislik Fakültesi |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Hydrogen Scanning electron microscope Analytical chemistry chemistry.chemical_element 02 engineering and technology Gas sensors 010402 general chemistry 01 natural sciences NiO Crystallinity Adsorption Materials Chemistry Electrical and Electronic Engineering Thin film SILAR Non-blocking I/O 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry hydrogen Crystallite Absorption (chemistry) 0210 nano-technology |
| Popis: | Nanostructured NiO thin films have been synthesized by a facile, low-cost successive ionic layer adsorption and reaction (SILAR) method, and the effects of the film thickness on their hydrogen gas sensing properties investigated. The samples were characterized by scanning electron microscopy (SEM), x-ray diffraction (XRD) analysis, and energy-dispersive x-ray analysis. The XRD results revealed that the crystallinity improved with increasing thickness, exhibiting polycrystalline structure. SEM studies showed that all the films covered the glass substrate well. According to optical absorption measurements, the optical bandgap decreased with increasing film thickness. The gas sensing properties of the nanostructured NiO thin films were studied as a function of operating temperature and gas concentration. The samples showed good sensing performance of H-2 gas with high response. The maximum response was 75% at operating temperature of 200A degrees C for hydrogen gas concentration of 40 ppm. These results demonstrate that nanostructured NiO thin films synthesized by the SILAR method have potential for application in hydrogen detection. |
| Databáze: | OpenAIRE |
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