Polymeric spatial resolution test patterns for mass spectrometry imaging using nano-thermal analysis with atomic...

Area of Science:

• Materials Science
• Analytical Chemistry
• Nanotechnology

Background:

• Developing high-resolution reference materials is crucial for advancing nanometer-scale molecular imaging.
• Existing resolution standards are often difficult to obtain or create for nano-scale chemical imaging.

Purpose of the Study:

• To fabricate and characterize novel polymeric spatial resolution test patterns.
• To utilize these patterns for evaluating and improving mass spectrometry chemical imaging resolution.

Main Methods:

• Electron beam lithography was used to create varied line width and spacing patterns in poly(methyl methacrylate) thin films.
• Patterns were characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, and atomic force microscopy.
• Nano-thermal analysis/mass spectrometry imaging was employed to assess pattern performance.

Main Results:

• Polymeric test patterns were successfully fabricated with defined line widths and spacings.
• The test patterns demonstrated efficacy in evaluating spatial resolution improvements.
• Heating the ionization interface to 200°C improved spatial resolution to an estimated 1.4 μm.

Conclusions:

• Electron beam lithography is a viable method for creating polymer-based spatial resolution test patterns.
• These patterns facilitate unbiased evaluation of advancements in nano-thermal analysis/atomic force microscopy/mass spectrometry chemical imaging.
• The developed patterns support both intra- and inter-laboratory comparisons of instrument performance.