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Design nanoporous metal thin films via solid state interfacial dealloying.

Chonghang Zhao1, Kim Kisslinger2, Xiaojing Huang3

  • 1Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY 11794, USA. Karen.Chen-Wiegart@stonybrook.edu.

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Summary

Thin-film solid-state interfacial dealloying creates fine nanoporous structures for catalysis and energy storage. This advanced technique offers controllable 3D nanoarchitectures with potential for wider applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Thin-film solid-state interfacial dealloying (thin-film SSID) is an emerging technique for fabricating nanoarchitectures.
  • The resulting 3D bicontinuous nanostructures show promise for catalysis, sensing, and energy storage applications.

Purpose of the Study:

  • To demonstrate thin-film SSID's capability in creating fine nanoporous structures (5-15 nm).
  • To explore the use of multilayer thin-film designs for broader substrate compatibility.
  • To investigate the phase evolution mechanisms in metal-agent dealloying.

Main Methods:

  • Multiscale microscopy: X-ray and electron nano-tomography.
  • Multimodal synchrotron diffraction and spectroscopy analysis.

Main Results:

  • Thin-film SSID can produce very fine (5-15 nm) nanoporous structures, among the finest achieved by metal-agent dealloying.
  • Multilayer designs enable nanoporous film fabrication on diverse substrates.
  • Phase evolution in metal-agent dealloying is influenced by both enthalpy and entropy changes.

Conclusions:

  • Thin-film SSID is a versatile technique for creating controllable 3D nanoarchitectures.
  • Entropy contributions are crucial for understanding phase evolution in dealloying processes.
  • This work advances the design principles for nanoarchitectural thin films and expands material selection possibilities.