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<p>In the present paper, Tungsten oxide (WO<sub>3</sub>) was synthesized using the sol-gel auto-combustion route. The microstructural properties of WO<sub>3</sub> nanoparticles were studied using XRD, and FE-SEM. The analysis of the XRD pattern reveals the monoclinic symmetry and confirms the presence of pure phase with space group P<sub>21/n</sub>, its lattice constant has been recorded, and also the average crystallite size was found to be 20.6&#xa0;nm. The morphological properties investigated by FESEM and the FE-SEM confirm the irregular shape of nanoparticles and the average particle size was found to be 60&#xa0;nm. The Raman spectroscopy showed the monoclinic WO<sub>3</sub> nanopowder phase’s characteristic vibration peaks. Each Raman peak corresponds to a vibration mode for the following modes W-O-W, O-W-O bending, and W-O-W stretching. Further, to observe the sensing properties of prepared WO<sub>3</sub> nanoparticles, its thick film paste is prepared and a sensor is fabricated on an alumina substrate. The sensing performance of the fabricated WO<sub>3</sub> thick film sensor is explored by measuring the resistance of the sensing film with varying concentrations (0-5000 ppm) of test gases. The response of the sensor for different gases such as acetone, propane, ammonia, and benzene in air ambient at room temperature is observed. It was found that the WO<sub>3</sub> thick film sensor showed the highest response (87%) to benzene gas (5000 ppm) in comparison to the other test gases at room temperature.</p>

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Study of microstructural, Raman spectra, and gas sensing properties of tungsten oxide

  • 期刊论文

  • 发表日期：

    2025年2月17日

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  • Satish Kumar Yadav,
  • Poonam Yadav,
  • Ankit Kumar Vishwakarma,
  • Lallan Yadava

摘要

In the present paper, Tungsten oxide (WO3) was synthesized using the sol-gel auto-combustion route. The microstructural properties of WO3 nanoparticles were studied using XRD, and FE-SEM. The analysis of the XRD pattern reveals the monoclinic symmetry and confirms the presence of pure phase with space group P21/n, its lattice constant has been recorded, and also the average crystallite size was found to be 20.6 nm. The morphological properties investigated by FESEM and the FE-SEM confirm the irregular shape of nanoparticles and the average particle size was found to be 60 nm. The Raman spectroscopy showed the monoclinic WO3 nanopowder phase’s characteristic vibration peaks. Each Raman peak corresponds to a vibration mode for the following modes W-O-W, O-W-O bending, and W-O-W stretching. Further, to observe the sensing properties of prepared WO3 nanoparticles, its thick film paste is prepared and a sensor is fabricated on an alumina substrate. The sensing performance of the fabricated WO3 thick film sensor is explored by measuring the resistance of the sensing film with varying concentrations (0-5000 ppm) of test gases. The response of the sensor for different gases such as acetone, propane, ammonia, and benzene in air ambient at room temperature is observed. It was found that the WO3 thick film sensor showed the highest response (87%) to benzene gas (5000 ppm) in comparison to the other test gases at room temperature.