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<p>This study presents the synthesis of a novel Ag-decorated Cu<sub>2</sub>O nanocomposite gas sensor using a hydrothermal method for the detection of a nitrogen dioxide (NO<sub>2</sub>) gas. Cu<sub>2</sub>O thin films were synthesized through a 48-h hydrothermal process and subsequently decorated with the silver nanoparticles to enhance the sensor performance. The structural, morphological, and optical characterizations confirmed the successful formation of a highly crystalline Cu<sub>2</sub>O with uniformly distributed Ag nanoparticles. Gas sensing properties were evaluated across different temperatures (100°C, 150°C, and 200°C) and two NO<sub>2</sub> gas concentrations (75–125&#xa0;ppm). Results demonstrated that the Ag@Cu<sub>2</sub>O–Si sensor exhibited faster response and recovery times, improved stability, and higher sensitivity compared with the bare Cu<sub>2</sub>O sensors. The optimal sensing temperature was found to be about 100°C with sensitivity of a about 26% at 125&#xa0;ppm. The enhanced performance is attributed to the synergistic effects of Ag nanoparticles, which improve surface adsorption and charge transfer kinetics. These findings suggest that the hydrothermally synthesized Ag@Cu<sub>2</sub>O nanocomposite is a promising candidate for real-time low-temperature NO<sub>2</sub> detection in both environmental and industrial applications.</p>

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Enhanced Gas Sensor Performance of Hydrothermally Synthesized Ag@Cu2O–Si: A Study at Low Temperature with High Sensitivity Approach

  • 期刊论文

  • 发表日期：

    2025年9月10日

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  • Evan T. Salim,
  • Rana O. Mahdi,
  • Mayyadah H. Mohsin,
  • Iman H. Hadi,
  • Doaa Sulaiman

摘要

This study presents the synthesis of a novel Ag-decorated Cu2O nanocomposite gas sensor using a hydrothermal method for the detection of a nitrogen dioxide (NO2) gas. Cu2O thin films were synthesized through a 48-h hydrothermal process and subsequently decorated with the silver nanoparticles to enhance the sensor performance. The structural, morphological, and optical characterizations confirmed the successful formation of a highly crystalline Cu2O with uniformly distributed Ag nanoparticles. Gas sensing properties were evaluated across different temperatures (100°C, 150°C, and 200°C) and two NO2 gas concentrations (75–125 ppm). Results demonstrated that the Ag@Cu2O–Si sensor exhibited faster response and recovery times, improved stability, and higher sensitivity compared with the bare Cu2O sensors. The optimal sensing temperature was found to be about 100°C with sensitivity of a about 26% at 125 ppm. The enhanced performance is attributed to the synergistic effects of Ag nanoparticles, which improve surface adsorption and charge transfer kinetics. These findings suggest that the hydrothermally synthesized Ag@Cu2O nanocomposite is a promising candidate for real-time low-temperature NO2 detection in both environmental and industrial applications.