Fig. 2
From: Enhanced ion tolerance of electrokinetic locomotion in polyelectrolyte-coated microswimmer
Element analysis and electrochemical characterization of the microswimmers. a STEM and Energy-dispersive X-ray spectroscopy (EDX) mapping images of the SPS coated silicon nanowire; scale bar is 50 nm. The brown window in STEM image indicates the elemental mapping area. b, c Rotating disk electrode (RDE) voltammogram of the bare silicon and the SPS-coated silicon wafer in 2 mM BQ and 1 M KCl aqueous solution. The scanning rate is 10 mV s−1. Rotation speeds are 300, 600, 900, 1200, 1500, 1800, and 2100 rpm, respectively. d Migration speed vs. the BQ’s concentration of bare microswimmer (blue) and SPS coated microswimmer (red). The inset is the Levich plot of the bare silicon (blue) and the SPS coated silicon wafer (red) at −0.5 V vs. Ag/AgCl
