Fig. 3From: Hydrogel tip attached quartz tuning fork for shear force microscopyShear force microscopy (SFM) with the PEGDA tip attached quartz tuning fork. Amplitude spectra of QTFs before and after the PEGDA tip attachment by a optical and b electrical readouts. c Schematic and circuit diagram for SFM. d Dynamic mode topography and e a linescan of a calibration sample along the dashed line A–A′Back to article page