AI Article Synopsis
- The paper discusses the creation of pure and chromium-doped tungsten trioxide (WO) thin films via spray pyrolysis, highlighting various analyses conducted on their structural and morphological properties.
- The study found that higher concentrations of Cr doping resulted in an increased average crystallite size and changes in surface roughness, which peaked at 3 wt % before decreasing, enhancing the films' suitability for gas-sensing applications.
- Notably, the thin films with 3 wt % Cr exhibited optimal gas-sensing capability towards xylene at room temperature, attributed to improved lattice defects and porous surface morphology from the doping process.
Article Abstract
This paper focused on the preparation of pure and Cr-doped tungsten trioxide (WO) thin films using the spray pyrolysis method. Different techniques were adopted to analyze these films' structural and morphological properties. The X-ray detection analysis showed that the average crystallite size of the WO-nanostructured thin films increased as the Cr doping concentration increased. The atomic force microscopy results showed that the root-mean-square roughness of the films increased with Cr doping concentration up to 3 wt % and then decreased. The increased roughness is favorable for gas-sensing applications. Surface morphology and elemental analysis of the films were studied by field emission scanning electron microscopy with energy-dispersive X-ray spectroscopy measurements. The 3 wt % Cr-WO has a large nanoflake-like structure with high surface roughness and porous morphology. Gas-sensing characteristics of undoped and Cr-doped WO thin films were investigated with various gases at room temperature. The results showed that 3 wt % Cr-doped WO film performed the maximum response toward 50 ppm of xylene with excellent selectivity at room temperature. We believe that increased lattice defects, surface morphology, and roughness due to Cr doping in the WO crystal matrix might be responsible for increased xylene sensitivity.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9798732 | PMC |
| http://dx.doi.org/10.1021/acsomega.2c05589 | DOI Listing |
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