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(a) SEM images of GNSs coatings synthesized at 900°C for different durations, from 5 to 60 min. Insets show optical images of a millimeter-sized water drop deposited with a syringe on corresponding surfaces. (b) The variation of CA, advancing CA (CAa), receding CA (CAr) and CA hysteresis (CAh) of hierarchical structures with GNSs and SNAs prepared with different growth times.
