Atomic force microscopy with nanoelectrode tips for high resolution electrochemical, nanoadhesion and nanoelectrical...

Area of Science:

• Electrochemistry
• Nanotechnology
• Surface Science

Background:

• Multimodal nano-imaging is crucial for understanding electrochemical systems.
• Existing techniques often lack simultaneous topographical, mechanical, and electrochemical data acquisition.
• Atomic force microscopy (AFM) platforms offer potential for high-resolution imaging.

Purpose of the Study:

• To develop and demonstrate a multimodal nano-imaging technique using AFM-based scanning electrochemical microscopy (SECM).
• To achieve simultaneous characterization of surface topography, nanomechanics, nanoelectronic properties, and electrochemical activity.
• To enable high-resolution electrochemical measurements in liquid environments.

Main Methods:

• Utilized an atomic force microscope (AFM) platform equipped with a nanoelectrode probe.
• Integrated PeakForce tapping AFM mode with SECM for multimodal data acquisition.
• Employed a nanoelectrode probe with a conical Pt tip (∼25 nm radius) for sub-100 nm spatial resolution.

Main Results:

• Successfully demonstrated simultaneous topographical, electrochemical, and nanomechanical characterization.
• Achieved sub-100 nm spatial resolution for electrochemical imaging in liquid.
• Characterized a surface defect on graphite, revealing correlated topographical, electrochemical, and nanomechanical information.
• Measured heterogeneous electrical conductivity of electrode surfaces in liquid.

Conclusions:

• The developed PeakForce SECM technique provides unprecedented resolution for multimodal nano-imaging in electrochemical environments.
• This approach enhances the understanding of surface heterogeneity on graphite and graphene for electrochemical applications.
• The methodology extends AFM-based nanoelectrical measurements to liquid media.