Figure 5: Plots of primary resonance mode frequency versus time for a SWNT compressed for three different distances on an amino-terminated alkanethiol monolayer: (a) 50 nm, (b) 300 nm, and (c) 710 nm. The dashed line indicates the contact point of the nanotube with the substrate. For this dataset, the length of the nanotube was 2.96 μm long. The cantilever resonance frequency was 72.99 kHz and had a spring constant of 2.5 N/m.