Dr. Oliver Krause, product developer at NANOSENSORS™ is talking in this screencast about AFM probes for dynamic AFM with sub-nanometer amplitudes enabling imaging with atomic and sub-nanometer resolution
Dynamic AFM with extremely small oscillation amplitudes of the probing tip enables Atomic Force Microscopy with atomic and even sub-atomic resolution. By adjusting the oscillation amplitude to the regime of short-range forces the impact of long-range forces on the detection mechanism can be suppressed effectively.
For stable operation the bending forces of the cantilever must be able to overcome the attractive tip-sample forces. Dynamic AFM with sub-nanometre amplitudes requires cantilevers with a force constant larger than 300N/m. The force constants of typical AFM probes for intermittent contact (Tapping Mode) are in the order of a few tens of N/m. Therefore, amplitudes of at least a few nanometres are required for stable operation.
Ultrastiff AFM cantilever probes with integrated sharp tips have been fabricated based on the well-established NANOSENSORS™ PointProbePlus® process. Cantilever geometries of 100µm length and 7 or even 10µm thickness have been realized resulting in force constants of 600 and 2000 N/m.
NANOSENSORS™ screencast on the service for Calibration for AFM Cantilevers, presented by Wolfgang Engl.
Accurately determined cantilever properties are very important for quantitative force measurements. Force constant and resonance frequency are determined either by thermal tune, the Sader- or the dimensional method, respectively. Usually, the thermal tune method delivers the most precise values, but suffers from the fact that the AFM tip has to get in contact to the urface to calibrate the photo-detector sensitivity. This procedure may damage or break the tip!
NANOSENSORS™ offers a thermal tune calibration procedure performed by Laser vibrometry. This method is contact free and therefore does no damage the tip, but preserves the original AFM tip quality. To ensure the highest level of accuracy NANOSENSORS™ cantilever calibration method is calibrated with a standard, certified by the national German metrology institute.
This service is part of our Special Development List
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