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Motion behavior of microrobots. (A) Optical microscopy images showing the trajectory of GQD–MRs at different time intervals (0, 2, 3, 5, 8, and 10 s). Scale bar: 10 μm. The yellow bar is added to guide the eye to follow the microrobot. (B) Histograms depicting the average speed data of GQD–MRs (a) before and (b) after biofunctionalization with the FAM-L probe. Experimental conditions: motion tracking was done in 1% H2O2 (v/v) for five different microrobots (n = 5).
