Fig. 1: Patterning of QDs array via SEPD.
a Zeta potentials of QDs capped with different ligand contents. The error bars are the standard deviation in measured zeta potentials for ten runs. Inset: schematic representation of a QD with ionized surface ligands. b Schematic illustration of the QDs patterning process on the in-plane parallel electrodes substrate. c Image of large-area ordered QD stripe pattern. Scale bar, 2 cm. d, e Microscopy images of the deposited QD stripe array showing the uniform size and a well-defined pattern. Scale bars are 200 and 20 μm, respectively. f, g Bright-field image and SEM image of QD pattern via SEPD. Scale bars are 50 and 10 μm, respectively. h Cross-sectional SEM images of QD stripes with different thickness. Scale bars, 5 μm. i Relationship between the deposited thickness of the QD stripe and deposition time at different electric fields. j Deposited QD stripe layer thickness as a function of electric field intensity (E) and QDs concentrations (CQD) product. k Fluorescence image of QD stripe array with a linewidth of ≈ 2 µm. Scale bar, 10 μm.
