Hybrid Sol-Gel-Derived Films That Spontaneously Form Complex Surface Topographies

Area of Science:

• Materials Science
• Nanotechnology
• Surface Chemistry

Background:

• Surface topography and nanoscale patterns are critical for biological interactions.
• Understanding the relationship between material composition and surface architecture is essential for designing functional materials.

Purpose of the Study:

• To synthesize and characterize novel two-component xerogel thin films using COE and TEOS.
• To investigate the surface morphology, composition, and mechanical properties of these films.

Main Methods:

• Synthesis of two-component xerogel thin films from COE and TEOS.
• Atomic Force Microscopy (AFM) for surface topography analysis.
• Colocalized AFM and Raman Spectroscopy for chemical and mechanical characterization.

Main Results:

• AFM revealed branched and hyperbranched architectures (2-30 μm diameter, 3-1300 nm height) with varying surface densities.
• AFM and Raman spectroscopy identified COE-rich domains as branched structures, exhibiting higher stiffness and lower capacitive force.
• Raman mapping detected discrete COE dimer and densified TEOS domains (≤300 nm) not visible via AFM.

Conclusions:

• The study successfully synthesized and characterized novel COE/TEOS xerogel films with complex surface architectures.
• The findings demonstrate a correlation between surface morphology, chemical composition (COE-rich domains), and mechanical properties.
• The presence of nanoscale compositional variations offers potential for tailored surface properties in biomaterials and other applications.