Glass Surface Nanostructuring by Soft Lithography and Chemical Etching

Area of Science:

• Materials Science
• Surface Engineering
• Nanotechnology

Background:

• Soda lime glass offers high durability and transparency, making it suitable for photovoltaics, optical instruments, and biomedical devices.
• Tailoring surface morphology via nanopatterning can enhance glass properties for specific technological demands.

Purpose of the Study:

• To develop a straightforward method for nanostructuring soda lime glass surfaces.
• To investigate the impact of nanostructuring on the glass surface's wettability and optical properties.

Main Methods:

• Utilized soft lithography with a polymeric mask followed by wet-chemical etching in potassium hydroxide (KOH) solutions.
• Characterized the resulting nanopatterns using microscopy to determine stripe width and height.
• Measured water contact angles and optical transmittance (including UV) to assess property changes.

Main Results:

• Successfully created nanopatterns with stripe widths of 220-450 nm and heights of 50-200 nm.
• Achieved significant modulation of water contact angles, from super-hydrophilic (~9°) to increased hydrophobicity (~20° increment).
• Observed minimal impact on visible light transparency and enhanced UV transmittance in some nanostructured samples.

Conclusions:

• The developed soft lithography and KOH etching method is effective for creating tunable nanopatterns on soda lime glass.
• Nanostructuring allows for precise control over surface wettability, crucial for applications requiring specific liquid interactions.
• The technique offers a viable route to enhance glass functionality for optical and energy applications without compromising transparency.