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Accelerating Palladium Nanowire H2 Sensors Using Engineered Nanofiltration.

Won-Tae Koo1, Shaopeng Qiao, Alana F Ogata

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A new metal-organic framework (MOF) nanofiltration layer, ZIF-8, enhances palladium (Pd) nanowire (NW) hydrogen sensors. This ZIF-8/Pd NW sensor offers faster response and recovery speeds in air, improving hydrogen detection.

Keywords:
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Palladium (Pd)-based hydrogen (H2) sensors, including Pd nanowires (NWs), suffer from interference by oxygen (O2) in ambient air.
  • Oxygen presence depresses sensitivity and slows the response/recovery speed of Pd NW H2 sensors compared to operation in inert gases like N2 or Ar.
  • Developing strategies to mitigate oxygen interference is crucial for improving the performance of Pd-based H2 sensors in real-world applications.

Purpose of the Study:

  • To prepare and characterize novel H2 sensors utilizing a nanofiltration layer to overcome oxygen interference.
  • To investigate the efficacy of a zinc-based metal-organic framework (MOF), specifically ZIF-8, as a protective layer for Pd NW H2 sensors.
  • To evaluate the impact of the ZIF-8 layer on the sensing properties, including sensitivity, response time, and recovery time, of Pd NW H2 sensors in air.

Main Methods:

  • Synthesis of ZIF-8 polyhedron particles directly onto lithographically patterned Pd NWs.
  • Fabrication of ZIF-8/Pd NW bilayered H2 sensors.
  • Characterization of sensor performance, including response amplitude, response speed, and recovery speed, in the presence of H2 and air.

Main Results:

  • The ZIF-8 layer, with its micropores (0.34 nm), effectively screens larger gas molecules like oxygen (0.345 nm) and nitrogen (0.364 nm) while allowing hydrogen (0.289 nm) to pass through.
  • Pd NWs coated with ZIF-8 (Pd NWs@ZIF-8) exhibited a slight reduction in response amplitude (3.5% vs. 5.9% for bare Pd NWs at 1% H2).
  • Pd NWs@ZIF-8 demonstrated significantly enhanced kinetics, with a 20-fold faster recovery (7 s vs. 229 s) and response (10 s vs. 164 s) compared to pristine Pd NWs.

Conclusions:

  • The ZIF-8 nanofiltration layer effectively mitigates oxygen interference in Pd NW H2 sensors through molecular sieving.
  • The ZIF-8 layer enhances the kinetic performance of Pd NW sensors, attributing to molecular sieving and acceleration effects.
  • These ZIF-8/Pd NW sensors achieve the fastest H2 sensing speeds among room-temperature Pd-based sensors reported to date.