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Atomic Layer-Modified 3D Pd Nanochannels for High-Performance Hydrogen Sensing.

Ahyeon Cho1, Hojin Kang2, Youngwook Cho2

  • 1Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.

ACS Sensors
|May 15, 2025
PubMed
Summary
This summary is machine-generated.

Atomic layer etching precisely controls palladium nanochannel interfaces, significantly boosting hydrogen sensor performance. This breakthrough enhances hydrogen detection sensitivity by up to 130-fold, paving the way for advanced sensing technologies.

Keywords:
atomic layer etchinghydrogennanopatternsecondary sputteringsensor

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Area of Science:

  • Materials Science and Engineering
  • Nanotechnology
  • Chemical Sensing

Background:

  • Palladium (Pd) is crucial for hydrogen (H2) sensing due to its adsorption properties and hydride formation.
  • Conventional Pd-based H2 sensors face performance limitations due to difficulties in controlling nanograin interfaces.
  • Precise atomic-level control of these interfaces is lacking in current fabrication techniques.

Purpose of the Study:

  • To develop and apply an atomic layer etching (ALE) technique for precise atomic-scale control of Pd nanochannels.
  • To enhance the performance of palladium-based hydrogen sensors through improved interface manipulation.
  • To investigate the impact of atomic-level surface modification on H2 sensing capabilities.

Main Methods:

  • Fabrication of 3D Pd nanopatterns with ultrasmall grain sizes using top-down nanolithography.
  • Implementation of a two-step ALE process (Cl2 plasma surface modification and NH3 ligand removal) for atomic-level etching (10 Å resolution).
  • Characterization of etch uniformity across a 4-inch wafer with less than 1% variation in etch per cycle (EPC).

Main Results:

  • Achieved precise atomic-level control over Pd nanochannel surfaces without compromising crystallinity.
  • Demonstrated a significant enhancement in H2 sensitivity, with a maximum 130-fold increase for 1% H2 concentration.
  • Attributed the performance boost to maximized palladium hydride (PdH) volume change from expanded intergrain gaps.

Conclusions:

  • The developed ALE technique offers unprecedented atomic-level precision for modifying noble metal nanostructures.
  • This approach significantly overcomes the limitations of conventional structural tuning methods for H2 sensors.
  • The platform holds promise for high-performance H2 sensors and other applications requiring atomic-level structural control.