Atomic force microscope nanolithography of polymethylmethacrylate polymer.

Area of Science:

• Materials Science
• Nanotechnology
• Surface Science

Background:

• Polymethylmethacrylate (PMMA) is a widely used polymer in microelectronics and nanotechnology.
• Precise surface patterning is crucial for advanced material applications.
• Existing nanolithography techniques can be complex and costly.

Purpose of the Study:

• To develop a novel nanolithography process for PMMA surfaces.
• To investigate the feasibility of using scanning contact atomic force microscopy (AFM) for material removal and patterning.
• To characterize the reproducibility and predictability of the generated topography.

Main Methods:

• A nanolithography process was developed using scanning contact atomic force microscopy (AFM) with a pyramidal silicon tip.
• The PMMA surface was first treated with electron beam irradiation in a scanning electron microscope (SEM) followed by development.
• Parallel furrows were created by scribing the PMMA surface using the AFM tip's scanning mechanism.

Main Results:

• The nanolithography process resulted in reproducible and predictable topographical features on the PMMA surface.
• Material displaced during scribing was observed to accumulate in adjacent regions.
• Aligned, elongated PMMA fragments were found to decorate the valleys between the scribed furrows.

Conclusions:

• Scanning contact atomic force microscopy provides an effective method for nanolithography on electron-beam-irradiated PMMA.
• The process allows for controlled material manipulation and topographical feature generation.
• This technique offers a promising route for nanoscale fabrication with high precision.