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<p>Hydrogen detection with rapid response and ultra-low detection limits remains a critical challenge for safety and energy applications. Here, we report a fullerene-decorated PdCo nano-resistor network sensor that integrates nanostructuring, alloying, and surface-engineering approaches. The C<sub>60</sub> layer enhances sensor performance by increasing the surface-to-volume ratio, enabling fast hydrogen diffusion, relieving mechanical stress during cycling, and guiding nanostructure morphology. Our composite device (20 nm C<sub>60</sub>/3 nm Teflon AF/5 nm Pd<sub>63</sub>Co<sub>37</sub>/30 nm Teflon AF) achieves a response time of 0.40 ± 0.06 s across 1–100 mbar H<sub>2</sub> and detects 40 ppb H<sub>2</sub> with a signal-to-noise ratio of 10 at room temperature. A poly(methyl methacrylate) (PMMA) topcoat further improves cycling stability and selectivity under 90% relative humidity and interfering gases. This design provides a scalable approach and opens the door to future adaptation of porous carbon-based frameworks and polymeric interlayers to realize robust, high-performance hydrogen sensors for real-world applications.</p>

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Fullerene-decorated PdCo nano-resistor network hydrogen sensors with sub-second response and parts-per-billion detection at room temperature

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月19日

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  • Tu Anh Ngo,
  • Ashwin T. Magar,
  • Minh T. Pham,
  • Hoang M. Luong,
  • Thi Thu Trinh Phan,
  • M. Tuan Trinh,
  • Michael Jung,
  • George K. Larsen,
  • Yiping Zhao,
  • Tho D. Nguyen

摘要

Hydrogen detection with rapid response and ultra-low detection limits remains a critical challenge for safety and energy applications. Here, we report a fullerene-decorated PdCo nano-resistor network sensor that integrates nanostructuring, alloying, and surface-engineering approaches. The C60 layer enhances sensor performance by increasing the surface-to-volume ratio, enabling fast hydrogen diffusion, relieving mechanical stress during cycling, and guiding nanostructure morphology. Our composite device (20 nm C60/3 nm Teflon AF/5 nm Pd63Co37/30 nm Teflon AF) achieves a response time of 0.40 ± 0.06 s across 1–100 mbar H2 and detects 40 ppb H2 with a signal-to-noise ratio of 10 at room temperature. A poly(methyl methacrylate) (PMMA) topcoat further improves cycling stability and selectivity under 90% relative humidity and interfering gases. This design provides a scalable approach and opens the door to future adaptation of porous carbon-based frameworks and polymeric interlayers to realize robust, high-performance hydrogen sensors for real-world applications.