Self-Oxidation Resistance of the Curved Surface of Achromatic Copper

Young Hoon Kim, Seong Gon Kim, Seunghun Lee, Miyeon Cheon, Su Jae Kim, Kideuk Nam, Bipin Lamichhane, Sung Heum Park, Min Hyoung Jung, Ji Soo Kim, Yu Seong Seo, Taewoo Ha, Jungseek Hwang, Hu Young Jeong, Yusil Lee, Young Hee Lee, Young Min Kim, Se Young Jeong

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Copper surfaces that exhibit a wide range of achromatic colors while still metallic have not been studied, despite advancements in antireflection coatings. A series of achromatic copper films grown with [111] preferred orientation by depositing 3D porous nanostructures is introduced via coherent/incoherent atomic sputtering epitaxy. The porous copper nanostructures self-regulate the giant oxidation resistance by constructing a curved surface that generates a series of monoatomic steps, followed by shrinkage of the lattice spacing of one or two surface layers. First-principles calculations confirm that these structural components cooperatively increase the energy barrier against oxygen penetration. The achromaticity of the single-crystalline porous copper films is systematically tuned by geometrical parameters such as pore size distribution and 3D linkage. The optimized achromatic copper films with high oxidation resistance show an unusual switching effect between superhydrophilicity and superhydrophobicity. The tailored 3D porous nanostructures can be a candidate material for numerous applications, such as antireflection coatings, microfluidic devices, droplet tweezers, and reversible wettability switches.

Original languageEnglish
Article number2210564
JournalAdvanced Materials
Volume35
Issue number42
DOIs
StatePublished - Oct 19 2023
Externally publishedYes

Keywords

  • achromatic metal films
  • antireflection
  • porous copper films
  • self-oxidation resistance
  • superhydrophilicity
  • superhydrophobicity

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