Imaging Mode Fundamental Imaging for Nanoscale Discovery Contact Mode is one of the foundational techniques in Atomic Force Microscopy (AFM), offering high-resolution imaging and force measurement capabilities. In this mode, a nanometric probe maintains constant contact with the sample surface, providing direct topographical information and friction data. Application fields Key Features Contact Mode - High Resolution: Achieve atomic-scale imaging on suitable samples. - Direct Force Measurement: Quantitative analysis of tip-sample interactions. - Versatility: Compatible with various sample types and environments. - Simultaneous Data Acquisition: Collect topography and friction data in a single scan. - Established Technique: Well-understood methodology with extensive literature support. Contact Mode AFM Force Curves Perform precise force-distance measurements to study: - Adhesion forces - Material elasticity - Surface energy Friction Analysis Utilize Lateral Force Microscopy (LFM) to investigate: - Nanoscale tribology - Surface lubrication - Material homogeneity Environmental Control Conduct experiments in various conditions: - Controlled atmosphere - Liquid environments - Temperature variations How does Contact Mode AFM work? 1. Probe-Surface Interaction: A sharp tip attached to a cantilever is brought into direct contact with the sample surface. 2. Constant Force: As the tip scans across the surface, a feedback loop maintains a constant cantilever deflection, ensuring consistent contact force. 3. Laser Detection: A laser beam reflected off the cantilever's back detects minute changes in its deflection. 4. Topography Mapping: Vertical movements of the piezoelectric scanner, adjusted to maintain constant deflection, are recorded to create a topographical map. 5. Friction Measurement: Torsional movements of the cantilever provide information about surface friction (Lateral Force Microscopy – LFM).
