Synthesis, Properties, and Gas Sensing Performance of Chromium doped Tungsten Oxide
Main Article Content
Abstract
Chromium (Cr)- doped tungsten oxide (WO3) nanostructures were successfully prepared by pulse laser ablation in liquid. In order to examine the morphological, structural, and optical characteristics of Cr-doped WO3 nanostructures and to suggest potential growth pathways, the impact of Cr content was examined. Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), and X-ray diffraction (XRD). XRD peaks confirmed the cubic structure and the reduction in crystallite size as dopant concentration increased. Surface characterization demonstrated the incorporation of chromium ions into the WO3 host lattice. The FESEM images clearly show that as doping increases, the WO3 nanoparticle size decreases. The absorption spectra show that the optical band gap energy decreases after doping and exhibit two absorption edges as the Cr concentration increases. The results showed that the sensitivity of the pure WO3 gas sensor to (60 ppm) NO2 at temperatures as high as (150 °C) was around (51.25 %). At around (100 °C), the maximum sensitivity of the WO3-doped (9 %) Cr gas sensor to (60 ppm) NO2 was (24.45 %), whereas at (25 °C), the same gas sensor's maximum sensitivity was (15.64 %).
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