Figure 4
From: Pulsed-laser micropatterned quantum-dot array for white light source
Comparison of QDs sprayed on flat and patterned sapphire substrates.
(a) An OM image of QDs sprayed onto the flat sapphire substrate. The coffee ring effect can be clearly observed at the surrounding edge of the QD droplets. (b) A scanning electron microscope (SEM) image of a laser-ablated square hole. Nano-ripples structure is formed at the laser-ablated locations, providing the hydrophobic surface. With the nano-ripples structure, the sprayed QDs are well confined in the patterned area as shown in (c).
