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<p>Gold (Au) nanoparticle-decorated octahedral Cu<sub>2</sub>O was synthesized and evaluated for ozone sensing at room temperature. Different Au loadings (1, 3, 5, and 7&#xa0;wt%) were incorporated to determine the optimum composition for maximum sensing performance. Structural and morphological characterizations were carried out using XRD, FESEM-EDX, and TEM analyses. The sensing studies were performed against 1&#xa0;ppm ozone at room temperature under a relative humidity of 50 ± 3%, and stability was assessed over three consecutive cycles. Among all samples, the 3&#xa0;wt% Au/Cu<sub>2</sub>O composite exhibited the highest sensor response (83.4–1&#xa0;ppm ozone), with a response time (T<sub>90</sub>) of 319&#xa0;s and recovery time (T<sub>r90</sub>) of 934&#xa0;s. Furthermore, this composition demonstrated an excellent detection limit of 1.12&#xa0;ppb, highlighting its potential as a highly sensitive and stable material for low-concentration ozone sensing applications.</p>

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Highly sensitive and selective ppb-level ozone gas sensing using Au/Cu2O composites

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Abdulmajeed Abdullah Alayyaf,
  • Mohammad Shariq,
  • Abdulaziz I. Alromaeh,
  • Ebtihal A. Mergani,
  • Ezdehar A. Elghazali,
  • Afaf I. Elghazali,
  • Faten E. El-Morsy,
  • Dewan R. Rahman,
  • Dai-Yu Chen,
  • Ren-Jang Wu

摘要

Gold (Au) nanoparticle-decorated octahedral Cu2O was synthesized and evaluated for ozone sensing at room temperature. Different Au loadings (1, 3, 5, and 7 wt%) were incorporated to determine the optimum composition for maximum sensing performance. Structural and morphological characterizations were carried out using XRD, FESEM-EDX, and TEM analyses. The sensing studies were performed against 1 ppm ozone at room temperature under a relative humidity of 50 ± 3%, and stability was assessed over three consecutive cycles. Among all samples, the 3 wt% Au/Cu2O composite exhibited the highest sensor response (83.4–1 ppm ozone), with a response time (T90) of 319 s and recovery time (Tr90) of 934 s. Furthermore, this composition demonstrated an excellent detection limit of 1.12 ppb, highlighting its potential as a highly sensitive and stable material for low-concentration ozone sensing applications.