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<p>Gas sensing technologies are increasingly in demand in industrial, medical, and environmental applications. Core@shell nanoparticle semiconductors provide enormous promise for detecting gases and volatile organic chemicals. We present a synthetic methodology for producing Ag@WO<sub>3</sub> Core@shell nanoparticles (CS-NPs) in liquid at room temperature using a Nd:YAG pulse laser. The performance of a novel core–shell nanoparticle material based on WO<sub>3</sub>, enhanced with silver (Ag), was developed and analyzed as an effective gas detection sensor. In this study, the properties of the single sensor and its suitability for NO<sub>2</sub> detection are discussed at different temperatures and gas concentrations, and the results reveal rapid response and recovery times, emphasizing the high sensitivity and efficiency of the Ag@WO<sub>3</sub> gas sensor for NO<sub>2</sub> gas detection. Higher operating temperatures further improved the response and recovery times of the sensor. The sensor had good switching features, including a quick reaction and recovery time at different temperatures (100&#xa0;°C, 130&#xa0;°C, and 160&#xa0;°C) and NO<sub>2</sub> concentrations (50&#xa0;ppm, 75&#xa0;ppm, and 100&#xa0;ppm). The maximum sensitivity was observed at 130&#xa0;°C indicating the optimal operating temperature for NO<sub>2</sub> sensor measurements; at higher NO<sub>2</sub> concentrations, changes in resistance became more pronounced necessitating careful management to prevent saturation or damage. Hence, this study revealed that the effectiveness of the sensor at low and medium gas concentrations is critical for practical applications particularly in scenarios that require efficient and robust NO<sub>2</sub> gas detection.</p>

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Enhanced gas sensing properties using Ag@WO3 core–shell nanoparticle prepared using liquid phase laser ablation

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Evan T. Salim,
  • Mustafa Hadi Amin,
  • Zaid T. Salim,
  • Jehan A. Saimon,
  • Ethar Yahya Salih,
  • Ahmed A. Al-Amiery,
  • Subash C. B. Gopinath

摘要

Gas sensing technologies are increasingly in demand in industrial, medical, and environmental applications. Core@shell nanoparticle semiconductors provide enormous promise for detecting gases and volatile organic chemicals. We present a synthetic methodology for producing Ag@WO3 Core@shell nanoparticles (CS-NPs) in liquid at room temperature using a Nd:YAG pulse laser. The performance of a novel core–shell nanoparticle material based on WO3, enhanced with silver (Ag), was developed and analyzed as an effective gas detection sensor. In this study, the properties of the single sensor and its suitability for NO2 detection are discussed at different temperatures and gas concentrations, and the results reveal rapid response and recovery times, emphasizing the high sensitivity and efficiency of the Ag@WO3 gas sensor for NO2 gas detection. Higher operating temperatures further improved the response and recovery times of the sensor. The sensor had good switching features, including a quick reaction and recovery time at different temperatures (100 °C, 130 °C, and 160 °C) and NO2 concentrations (50 ppm, 75 ppm, and 100 ppm). The maximum sensitivity was observed at 130 °C indicating the optimal operating temperature for NO2 sensor measurements; at higher NO2 concentrations, changes in resistance became more pronounced necessitating careful management to prevent saturation or damage. Hence, this study revealed that the effectiveness of the sensor at low and medium gas concentrations is critical for practical applications particularly in scenarios that require efficient and robust NO2 gas detection.