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<p>For noninvasive asthma diagnosis by breath analysis, iron oxides (Fe<sub>2</sub>O<sub>3</sub>) were designed as sensitive electrodes to fabricate an yttria-stabilized zirconia (YSZ)-based nitric oxide (NO) sensor. The sensitivity of the sensors was improved by varying the content of NH<sub>4</sub>F to regulate the morphology. When the content of NH<sub>4</sub>F is 6 mmol, the sensitive Fe<sub>2</sub>O<sub>3</sub> electrode presents a spherical nanoscale microstructure with better porosity and dispersibility. Consequently, the sensor with such an electrode delivers a superior response of -10 mV to 10 ppm NO. The polarization curve also demonstrates that the sensitive electrode material has the highest electrochemical catalytic ability for NO. Meanwhile, the NO sensor has a wide detection range of 1–100 ppm, with a sensitivity of -15 mV/decade for 1–100 ppm NO. The low detection limit of the fabricated NO sensor could reach 1 ppm, and the response is -1.5 mV. In addition, the response and recovery times for 1−100 ppm NO were less than 35&#xa0;s, indicating excellent response and recovery properties. The response to other interfering gases did not exceed that to NO, indicating good selectivity for NO. The device also has acceptable humidity resistance and excellent long-term stability during continuous measurements over 25 days. These findings indicate that the developed sensor has good prospects for breath analysis in fast and real-time noninvasive asthma diagnosis.</p>

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YSZ-based mixed potential type NO sensor with iron oxide sensing electrode for breath diagnosis

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • Ning Wang,
  • Long Zhao,
  • Xiaolan Shi,
  • Cuicui Liu,
  • Jing Wang,
  • Xidong Hao,
  • Yuehui Wang

摘要

For noninvasive asthma diagnosis by breath analysis, iron oxides (Fe2O3) were designed as sensitive electrodes to fabricate an yttria-stabilized zirconia (YSZ)-based nitric oxide (NO) sensor. The sensitivity of the sensors was improved by varying the content of NH4F to regulate the morphology. When the content of NH4F is 6 mmol, the sensitive Fe2O3 electrode presents a spherical nanoscale microstructure with better porosity and dispersibility. Consequently, the sensor with such an electrode delivers a superior response of -10 mV to 10 ppm NO. The polarization curve also demonstrates that the sensitive electrode material has the highest electrochemical catalytic ability for NO. Meanwhile, the NO sensor has a wide detection range of 1–100 ppm, with a sensitivity of -15 mV/decade for 1–100 ppm NO. The low detection limit of the fabricated NO sensor could reach 1 ppm, and the response is -1.5 mV. In addition, the response and recovery times for 1−100 ppm NO were less than 35 s, indicating excellent response and recovery properties. The response to other interfering gases did not exceed that to NO, indicating good selectivity for NO. The device also has acceptable humidity resistance and excellent long-term stability during continuous measurements over 25 days. These findings indicate that the developed sensor has good prospects for breath analysis in fast and real-time noninvasive asthma diagnosis.