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Updated: Oct 7, 2025

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Self-Organized Fractal Structures on Plasma-Exposed Silver Surface.

Xuefen Kan1, Ke Chen1, Cheng Yin1

  • 1The Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology, Hohai University, Changzhou, China.

Frontiers in Chemistry
|January 10, 2022
PubMed
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Researchers observed a novel planar fractal microstructure on silver films using positive corona discharge. This plasma oxidation effect creates dendritic patterns, unlike those from negative discharge, with potential applications in fractal photonic metamaterials.

Area of Science:

  • Materials Science
  • Plasma Physics
  • Surface Science

Background:

  • Surface morphology significantly influences material properties.
  • Corona discharge is a known method for material surface modification.
  • Fractal structures exhibit self-similarity and hierarchical properties.

Purpose of the Study:

  • To investigate the surface morphology of silver films treated with positive corona discharge.
  • To characterize the fractal nature of the observed microstructure.
  • To propose a growth model for the fractal structure formation.

Main Methods:

  • Treatment of silver films using positive corona discharge.
  • Surface morphology analysis using microscopy.
  • Development of a growth model based on modified diffusion-limited aggregation (DLA).
Keywords:
Corona discharge plasmadiffusion-limited aggregationhot spotplanar fractal structuresurface modification

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  • Numerical simulation of ion behavior and hot spot density.

    • Main Results:

    • First observation of planar fractal microstructure on silver films via positive corona discharge.
    • Dendritic patterns with self-similarity and hierarchy formed due to plasma oxidation.
    • Negative corona discharge resulted in different surface morphology without fractal characteristics.
    • Numerical simulations confirmed high hot spot density in fractal patterns.

    Conclusions:

    • Positive corona discharge induces unique fractal surface structures on silver films.
    • The observed fractal growth is explained by electric field-directed diffusion of positive ions.
    • The fractal microstructure holds potential for applications in fractal photonic metamaterials.