PeakForce Tapping

PeakForce Tapping is an AFM mode in which the cantilever is far below resonance. This mode can form a series of continuous force-distance curves through detection. While keeping the peak force constant through direct force control, it is also possible to extract and quantify a variety of material properties from the force-distance curve at each pixel in the image, including modulus, adhesion and depth of deformation. The advantage of PeakForce Tapping is that it uses a constant feedback loop to adjust the relative position of the tip sample. PeakForce tapping uses a sine slope instead of a linear slope, so when the tip is close to the surface, the tip speed is close to zero. These functions ensure precise and direct control of the tip sample interaction force, enabling imaging in fluid with a force of 100pN or less.