Bio-inspired antimicrobial surfaces fabricated by glancing angle deposition.

Area of Science:

• Materials Science
• Nanotechnology
• Biomimetics

Background:

• Natural cicada wings exhibit unique 3D nanofeature arrays conferring antimicrobial and antireflective properties.
• Replicating these complex nanostructures via top-down nanofabrication presents significant challenges.
• Existing methods struggle with scalability and precise morphological control of 3D nanofeatures.

Purpose of the Study:

• To develop an efficient nanofabrication method for creating cicada-wing-inspired antimicrobial surfaces.
• To overcome the limitations of top-down approaches for synthesizing 3D nanostructures.
• To validate the antimicrobial efficacy of the synthesized mimicry surfaces.

Main Methods:

• Utilized Glancing Angle Deposition (GLAD) combined with bottom-up self-assembled nanospheres.
• Grew sub-100 nm pillars atop nanosphere bases to mimic cicada wing morphology.
• Characterized synthesized surfaces using scanning electron microscopy (SEM).

Main Results:

• Synthesized surfaces quantitatively and qualitatively resemble natural cicada wings.
• Achieved hydrophobic surfaces with a water contact angle of 125˚.
• Demonstrated significant antimicrobial properties against Escherichia coli (E. coli) with flat growth curves.

Conclusions:

• The developed nanofabrication process successfully mimics cicada wing nanostructures.
• The synthetic surfaces exhibit potent antimicrobial activity.
• This approach holds potential for large-area antimicrobial applications in the food and biomedical industries.