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<p>The present study systematically investigates the influence of sintering temperature on the gas-sensing and photocatalytic performance of pristine WO<sub>3</sub> nanostructures synthesized via a facile one-step hydrothermal route. The as-synthesized WO<sub>3</sub> powders were sintered at 425, 525, 625, and 725&#xa0;°C to modulate their structural, morphological, optical, and surface characteristics. Comprehensive characterization using XRD, FE-SEM/EDX, TEM/HRTEM, XPS, UV–Vis spectroscopy and BET surface area analysis confirmed the formation of phase-pure monoclinic WO<sub>3</sub> with a well-defined nanoplate-like morphology. Among the investigated samples, WO<sub>3</sub> sintered at 525&#xa0;°C exhibited optimized crystallinity, an enhanced specific surface area, favourable pore characteristics and a higher concentration of surface oxygen species. Gas-sensing measurements demonstrated a maximum response of 85.09% to 100 ppm acetone at 300&#xa0;°C, with rapid response (30&#xa0;s) and recovery (90&#xa0;s) times, excellent selectivity, and long-term stability. In addition, the same sample showed higher photocatalytic performance, achieving approximately 40% degradation of methylene blue under natural sunlight irradiation within 2&#xa0;h. The enhanced dual functionality is attributed to the synergistic effects of optimized grain size, increased surface area, improved charge transport and enriched surface oxygen chemistry, all of which are governed by the sintering temperature. These findings establish sintering temperature as a critical parameter for tailoring pristine WO<sub>3</sub> nanostructures for efficient acetone gas sensing and photocatalytic wastewater remediation applications.</p>

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Thermally engineered WO3 nanoplates for enhanced acetone sensing and solar-driven photocatalysis

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Abhijeet P. Patil,
  • Suraj S. Patil,
  • Pandurang A. Ghadage,
  • Yuvraj H. Navale,
  • Bajarang B. Patil,
  • Kiran P. Shinde,
  • K. B. Kim,
  • Rameshwar R. Kothawale

摘要

The present study systematically investigates the influence of sintering temperature on the gas-sensing and photocatalytic performance of pristine WO3 nanostructures synthesized via a facile one-step hydrothermal route. The as-synthesized WO3 powders were sintered at 425, 525, 625, and 725 °C to modulate their structural, morphological, optical, and surface characteristics. Comprehensive characterization using XRD, FE-SEM/EDX, TEM/HRTEM, XPS, UV–Vis spectroscopy and BET surface area analysis confirmed the formation of phase-pure monoclinic WO3 with a well-defined nanoplate-like morphology. Among the investigated samples, WO3 sintered at 525 °C exhibited optimized crystallinity, an enhanced specific surface area, favourable pore characteristics and a higher concentration of surface oxygen species. Gas-sensing measurements demonstrated a maximum response of 85.09% to 100 ppm acetone at 300 °C, with rapid response (30 s) and recovery (90 s) times, excellent selectivity, and long-term stability. In addition, the same sample showed higher photocatalytic performance, achieving approximately 40% degradation of methylene blue under natural sunlight irradiation within 2 h. The enhanced dual functionality is attributed to the synergistic effects of optimized grain size, increased surface area, improved charge transport and enriched surface oxygen chemistry, all of which are governed by the sintering temperature. These findings establish sintering temperature as a critical parameter for tailoring pristine WO3 nanostructures for efficient acetone gas sensing and photocatalytic wastewater remediation applications.