Standard AFM Probes
Tapping mode is the most common AFM mode used for scanning in liquids or in ambient conditions. The cantilever intermittently contacts the surface and oscillates with sufficient amplitude which eliminates frictional forces. In non-contact mode the tip and the sample do not touch. The tip is typically 1 nm to 10 nm above the surface to get the best results. Non-contact mode is commonly used for measuring soft samples like organic thin film or biological samples to avoid contaminating the sample.