Scholarlink

<p>In this study, spherical-structured α-manganese dioxide/zinc oxide (α-MnO₂/ZnO) composites were synthesized via a hydrothermal method at 120&#xa0;°C. The composites were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and Brunauer–Emmett–Teller (BET) surface area analysis. The α-MnO₂/ZnO composite exhibited enhanced hydrogen (H₂) gas sensing performance compared to pure α-MnO₂. At 1000 ppm hydrogen, the MnO₂/ZnO (1:4) sensor exhibited a significantly higher response (S = 7.05) than pure MnO₂ (S = 1.92), with a response time (T₉₀) of 295 s and a faster recovery time (Tr₉₀ = 97 s) at room temperature. Even at a low concentration of 62 ppm H₂, the composite maintained a high response (S = 3.17), with T₉₀ = 314 s and Tr₉₀ = 250 s, clearly outperforming pure MnO₂. The limit of detection (LOD) for H₂ sensing using the α-MnO₂/ZnO (1:4) sensor was calculated to be 59 ppm. A possible gas sensing mechanism for the MnO₂/ZnO composite is proposed, highlighting the synergistic effect of ZnO integration in enhancing both sensitivity and response dynamics.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Room temperature hydrogen gas sensor based on α-MnO2/ZnO composite material

  • 期刊论文

  • 发表日期：

    2025年10月14日

查看全文
  • Ya-Wen Kuo,
  • Ren-Jang Wu,
  • Umesh Fegade,
  • Rajesh Dhake,
  • Tariq Altalhi

摘要

In this study, spherical-structured α-manganese dioxide/zinc oxide (α-MnO₂/ZnO) composites were synthesized via a hydrothermal method at 120 °C. The composites were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and Brunauer–Emmett–Teller (BET) surface area analysis. The α-MnO₂/ZnO composite exhibited enhanced hydrogen (H₂) gas sensing performance compared to pure α-MnO₂. At 1000 ppm hydrogen, the MnO₂/ZnO (1:4) sensor exhibited a significantly higher response (S = 7.05) than pure MnO₂ (S = 1.92), with a response time (T₉₀) of 295 s and a faster recovery time (Tr₉₀ = 97 s) at room temperature. Even at a low concentration of 62 ppm H₂, the composite maintained a high response (S = 3.17), with T₉₀ = 314 s and Tr₉₀ = 250 s, clearly outperforming pure MnO₂. The limit of detection (LOD) for H₂ sensing using the α-MnO₂/ZnO (1:4) sensor was calculated to be 59 ppm. A possible gas sensing mechanism for the MnO₂/ZnO composite is proposed, highlighting the synergistic effect of ZnO integration in enhancing both sensitivity and response dynamics.