Chemical force microscopy for hot-embossing lithography release layer characterization

Area of Science:

• Materials Science
• Surface Chemistry
• Polymer Physics

Background:

• Hot-embossing is a key polymer processing technique.
• Understanding stamp-polymer interactions is crucial for process optimization.
• The glass transition temperature significantly influences polymer properties.

Purpose of the Study:

• To model the hot-embossing stamp-polymer interaction.
• To investigate the effect of temperature on interfacial forces.
• To understand the role of surface chemistry in adhesion and friction.

Main Methods:

• Variable temperature chemical force microscopy (VT-CFM).
• Utilized tips functionalized with four distinct hydro- and hydrofluoroalkyl self-assembling monolayers (SAMs).
• Studied interactions with a poly(cyclic olefin) (PCO) thin-film across its glass transition range.

Main Results:

• Adhesion and friction forces were measured as a function of temperature.
• The influence of different SAM chemistries on interfacial forces was quantified.
• Changes in PCO surface properties near the glass transition were observed.

Conclusions:

• VT-CFM provides valuable insights into hot-embossing mechanisms.
• Surface chemistry of the stamp significantly impacts processing behavior.
• Temperature-dependent interfacial forces are critical for controlling hot-embossing outcomes.