Color-neutral, transparent, antimicrobial glass surface based on nanostructured Cu-Zn.

Area of Science:

• Materials Science
• Surface Engineering
• Antimicrobial Technology

Background:

• Touchscreen displays require surfaces that are durable, visually clear, and increasingly, hygienic.
• Existing antimicrobial solutions may compromise optical properties or color neutrality, hindering integration into high-quality displays.

Purpose of the Study:

• To develop transparent, color-neutral, and antimicrobial surfaces for touchscreen applications.
• To optimize a copper-zinc (Cu-Zn) ultra-thin metal film for enhanced visual and antimicrobial properties.
• To ensure the developed surface meets stringent display industry standards and functional requirements.

Main Methods:

• Co-sputtering of copper-zinc (Cu-Zn) ultra-thin metal film onto a glass substrate.
• Annealing process to induce nanostructuring of the Cu-Zn film.
• Optical transmission and color difference (ΔE) measurements using CIE 1976 Lab* color space.
• Electrical insulation testing for capacitive touch compatibility.
• Antimicrobial efficacy testing via biological analysis.

Main Results:

• Achieved optical transmission exceeding 80% in the visible spectrum.
• Demonstrated color difference ΔE under 3, ensuring high color neutrality.
• Validated high bactericidal efficacy meeting U.S. Environmental Protection Agency requirements.
• Confirmed electrical insulation properties suitable for capacitive touch functionality.
• Developed a lithography-free fabrication process for scalability.

Conclusions:

• The nanostructured Cu-Zn surface offers a promising solution for transparent, color-neutral, and antimicrobial coatings in display technology.
• The combination of copper's antimicrobial properties and zinc's color-dampening effect creates a unique material for hygienic interactive surfaces.
• The scalable, lithography-free fabrication process facilitates the adoption of these advanced surfaces in next-generation displays.