Mode-synthesizing atomic force microscopy for volume characterization of mixed metal nanoparticles

Area of Science:

• Nanotechnology
• Materials Science
• Surface Science

Background:

• Atomic force microscopy (AFM) excels at nanoscale surface analysis but struggles with subsurface properties.
• Nanometrology faces challenges in observing and characterizing internal nanoscale features.
• Existing AFM techniques are limited in their ability to probe beyond the surface.

Purpose of the Study:

• To present the potential of mode-synthesizing AFM (MSAFM) for advanced volume characterization.
• To demonstrate MSAFM's capability in analyzing multilayered nanoscale structures.
• To explore quantitative correlations in ultrasonic frequency actuation for enhanced nanometrology.

Main Methods:

• Utilizing mode-synthesizing atomic force microscopy (MSAFM).
• Employing nonlinear frequency mixing from interacting ultrasonic waves generated by the AFM probe (fp) and sample (fs).
• Characterizing metallic nanoparticles with a nickel core and gold envelope structure.

Main Results:

• MSAFM demonstrates significant potential for advanced volume characterization at the nanoscale.
• The study highlights the importance of probe (fp) and sample (fs) frequency actuation in quantitative analysis.
• Successful characterization of multilayered metallic nanoparticles was achieved.

Conclusions:

• MSAFM provides a powerful new approach for subsurface nanoscale metrology.
• This technique overcomes limitations of traditional AFM by enabling volume characterization.
• MSAFM is a promising tool for detailed analysis of complex nanostructures like multilayered nanoparticles.