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Noble-metal nanoparticles (NPs) enhance hydrogen (H2) sensing. Cubic palladium NPs on ZnO nanorods show superior H2 detection due to specific facet exposure, improving sensor performance.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Noble-metal nanoparticles (NPs) are crucial for enhancing hydrogen (H2) sensing capabilities.
  • The influence of specific facets on the H2 sensing performance of NPs remains underexplored.
  • Facet-dependent catalytic and adsorption properties significantly impact gas sensor performance.

Purpose of the Study:

  • To investigate the effect of different facets of palladium (Pd) nanoparticles on the H2 sensing performance of ZnO nanorods.
  • To correlate the exposed facets of Pd NPs with their adsorption and catalytic activity for H2 detection.
  • To optimize H2 sensor performance by controlling NP morphology and facet exposure.

Main Methods:

  • Synthesis of shape-controlled palladium nanoparticles (NPs) including cubic, octahedral, and spherical morphologies.
  • Loading of synthesized Pd NPs onto zinc oxide (ZnO) nanorods.
  • Detection and analysis of gas sensing performance of Pd NP-loaded ZnO towards 250 ppm H2.

Main Results:

  • Cubic Pd NPs-loaded ZnO exhibited significantly higher and faster sensing response to H2 compared to octahedral and spherical Pd NPs-loaded ZnO.
  • The enhanced performance of cubic Pd NPs is attributed to stronger H2 adsorption by the (100) facets.
  • Cubic Pd NPs-loaded ZnO demonstrated superior sensing selectivity and repeatability for H2 detection.

Conclusions:

  • The exposed facets of noble-metal nanoparticles critically influence H2 sensing performance.
  • Palladium nanoparticles with (100) facets (cubic morphology) offer superior H2 adsorption and catalytic activity.
  • Facet engineering of Pd NPs presents a promising strategy for developing high-performance H2 sensors.