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. 2016 Jul 25;6:30021. doi: 10.1038/srep30021

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(a) A force distance curve obtained on a nanobubble. Stages of tip-nanobubble interaction are labeled in the same sequence as in Fig. 3 (b) Reference signal. Five superimposed force-distance curves for the sample substrate shown along with average signal. (c) Deflection signal of tip-nanobubble interaction obtained by subtracting the reference signal from experimental data. One can clearly see two slopes in extension and retraction motion, which correspond to the pyramid tip-nanobubble interaction region.