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A novel acoustic gas sensor, based on the Quartz Crystal Microbalance (QCM) technology, has been developed specifically for detecting nitrogen dioxide (NO2). The sensor utilizes a thin film of molybdenum trioxide (MoO3), which was deposited onto the QCM using the drop casting technique. The solution of MoO3 nanoparticles were prepared using chemical synthesis route. The prepared MoO3/QCM sensor was utilized for the detection of NO2 gas at room temperature. Gas sensing experiments were conducted using an in-house developed sensor test rig by varying the concentrations of NO2. The sensor exhibited a notable frequency shift of 48.83 Hz towards an 80 ppm concentration of NO2 gas. Cross-selectivity measurements were performed in presence of other hazardous gases. The results indicated that the gas sensor displayed the highest sensitivity towards NO2 among the other tested gases, making it an excellent candidate for applications in NO2 gas detection.

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Realization of MoO3 Sensing Layer Based QCM Sensor for Detection of NO2 Gas

  • 会议论文

  • 发表日期：

    2025年

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  • Harsh Agrahari,
  • Ayush Kumar Chaubey,
  • Shubhra Priyadarshini,
  • Kaustubh Rawat,
  • Ajay K. Sao,
  • Jatinder Pal Singh,
  • Anjali Sharma,
  • Monika Tomar,
  • Arijit Chowdhuri

摘要

A novel acoustic gas sensor, based on the Quartz Crystal Microbalance (QCM) technology, has been developed specifically for detecting nitrogen dioxide (NO2). The sensor utilizes a thin film of molybdenum trioxide (MoO3), which was deposited onto the QCM using the drop casting technique. The solution of MoO3 nanoparticles were prepared using chemical synthesis route. The prepared MoO3/QCM sensor was utilized for the detection of NO2 gas at room temperature. Gas sensing experiments were conducted using an in-house developed sensor test rig by varying the concentrations of NO2. The sensor exhibited a notable frequency shift of 48.83 Hz towards an 80 ppm concentration of NO2 gas. Cross-selectivity measurements were performed in presence of other hazardous gases. The results indicated that the gas sensor displayed the highest sensitivity towards NO2 among the other tested gases, making it an excellent candidate for applications in NO2 gas detection.