Abstract
Barium stannate (BaSnO3) particles were synthesized using a one-step flame spray pyrolysis (FSP) method. The fabricated ceramic powders were investigated in terms of the structural, morphological, and optical properties by using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), zeta particle size analyzer, UV–Visible spectroscopy (UV–Vis) and photoluminescence spectroscopy (PL). The XRD results showed the structure of BaSnO3 crystals has been obtained when the powders were exposed at high temperatures, specifically at 1200 °C. The synthesized particles in the submicron size in a range of 70–980 nm were produced. The optical bandgap value of the synthesized crystals was calculated using reflectance spectra with the Kubelka–Munk method and found as 3.14 eV. When the powders were excited at 375 nm, they exhibited emission bands in the visible and near-infrared region (NIR) of the electromagnetic spectrum. In this study, the intensity- and decay time-based gas sensing properties of nanoscale BaSnO3 embedded in ethyl cellulose (EC) thin films when exposed to the vapors of different solvents were also measured. The optical sensitivities (I-I0/I0) of the sensing materials for the NH3, acetone, and EtOH solvent vapors were calculated as 0.835, 0.672, and 0.521, respectively.
Highlights
The chemical formula of perovskite oxides is A+ 2 B+ 4 X3 − 2, where 'A' and 'B' are two metal ions of various sizes, and X is an anion, which bonds to both cations
The fabricated ceramic powders were investigated in terms of the structural, morphological, and optical properties by using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), X-Ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), zeta particle size analyzer, UVvisible spectroscopy (UV-vis) and photoluminescence spectroscopy (PL)
BaSnO3 particles, which were not previously produced by flame spray pyrolysis (FSP), were successfully synthesized and the cubic phase structure was obtained at 1200 °C
Summary
The chemical formula of perovskite oxides is A+ 2 B+ 4 X3 − 2, where 'A' and 'B' are two metal ions of various sizes, and X is an anion, which bonds to both cations. The technique has many advantages such as the control simplicity over the process and the reproducibility of the technique, the ease of the spray of the precursor into the flame with using the high-velocity spray jet, the dispersion potential of the prepared precursor directly in the fuel, and the faster aerosol formation. For this reason, the FSP has been applied many times in the production of nanoscale metal oxides and complex metal oxides. In this study, the optical gas sensing properties of the BaSnO3 nanoparticles embedded in thin films to vapors of ethanol, acetone, and ammonia were presented
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