Force Microscopy Techniques and Applications
Research Guide

The atomic force microscope, introduced by G. Binnig, C. F. Quate, and Ch. Gerber (1986), measures forces as small as 10⁻¹⁸ N to image insulator surfaces at the atomic scale. It combines principles of the scanning tunneling microscope with a stylus detecting attractive and repulsive forces. This enables investigation of non-conducting materials without electrical contact.

Elastic properties are measured via nanoindentation with AFM, as in Changgu Lee et al. (2008), where force-displacement data on monolayer graphene yielded a Young's modulus of 340 N/m. W. C. Oliver and George M. Pharr (1992) provided techniques for hardness and modulus from load-displacement curves in indentation experiments. These methods apply nonlinear elastic stress-strain frameworks to nanoscale samples.

Force microscopy supports single-molecule studies and biological applications through force spectroscopy and surface force measurements. Techniques reveal intermolecular forces and mechanochemistry relevant to cellular processes. The field covers membrane properties, as extended from early models like Hodgkin and Huxley (1952) on nerve conduction, now probed at the nanoscale.

Nanotribology papers examine nanoscale friction and mechanical manipulation using AFM-based force techniques. They address surface forces and atomic-scale interactions, building on foundational work like "Intermolecular and Surface Forces" by Israelachvili (2011). These studies quantify friction in materials like graphene via indentation and spectroscopy.

AFM has advanced from basic force detection in Binnig et al. (1986) to high-speed imaging and spectroscopy for dynamic processes. Techniques now include load-sensing indentation per Oliver and Pharr (1992) and graphene nanoindentation by Lee et al. (2008). This supports applications in mechanochemistry and single-molecule mechanics.