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<p>Breath analysis offers noninvasive and painless route for early detection of metabolic disorders, where acetone is recognized as critical breath biomarker for diabetes and abnormal fat metabolism. Therefore, an in-depth analysis of gas sensing parameters for acetone detection using CeO<sub>2</sub>-Cr<sub>2</sub>O<sub>3</sub> composite has been explored. The composite was synthesized via solid state route at 400˚C and was pressed into pellet using hydraulic press. Subsequently, the detailed analysis of impedance spectroscopy confirmed semiconductor-like electrical behavior of the composite, which is highly affected by temperature and frequency. Furthermore, sensing characteristics of composite were investigated for various acetone concentrations at room temperature using AC impedance spectroscopy which exhibited dual behavior (p-type at low frequency region and n-type at high frequency region). The sensor exhibited increasing response with rising acetone concentration with the magnitude varying across low, mid and high frequency regions. The dynamic response was recorded to measure response and recovery times to be 20.7s and 12.9s, respectively. Repeatability tests confirmed that the sensor consistently produced stable responses across multiple cycles of acetone exposure, demonstrating its reliable performance. Moreover, the effect of acetone concentration with varying frequency on capacitance and conductivity were also studied.</p>

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Temperature-Dependent AC Conduction Mechanisms and Room-Temperature Acetone Sensing Performance of CeO2–Cr2O3 Composite

  • 期刊论文

  • 发表日期：

    2026年8月1日

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  • Laiba Asif,
  • Qaisar Abbas,
  • Syed Mesam Tamar Kazmi,
  • Matloob Hussain Bhatti,
  • F. Sher,
  • M. A. Rafiq

摘要

Breath analysis offers noninvasive and painless route for early detection of metabolic disorders, where acetone is recognized as critical breath biomarker for diabetes and abnormal fat metabolism. Therefore, an in-depth analysis of gas sensing parameters for acetone detection using CeO2-Cr2O3 composite has been explored. The composite was synthesized via solid state route at 400˚C and was pressed into pellet using hydraulic press. Subsequently, the detailed analysis of impedance spectroscopy confirmed semiconductor-like electrical behavior of the composite, which is highly affected by temperature and frequency. Furthermore, sensing characteristics of composite were investigated for various acetone concentrations at room temperature using AC impedance spectroscopy which exhibited dual behavior (p-type at low frequency region and n-type at high frequency region). The sensor exhibited increasing response with rising acetone concentration with the magnitude varying across low, mid and high frequency regions. The dynamic response was recorded to measure response and recovery times to be 20.7s and 12.9s, respectively. Repeatability tests confirmed that the sensor consistently produced stable responses across multiple cycles of acetone exposure, demonstrating its reliable performance. Moreover, the effect of acetone concentration with varying frequency on capacitance and conductivity were also studied.