Fig. 2
From: Black phosphorus ink formulation for inkjet printing of optoelectronics and photonics
BP ink jetting and drying. a Photograph of formulated BP ink. b Droplet jetting sequence observed from the printer stroboscopic camera. c Change in contact angle for the NMP dispersion, the BP-IPAS.E. (after solvent exchange) and the BP ink on Si/SiO2 during the drying process. The horizontal axis is normalised to the drying time of each droplet; droplet drying process d without and e with a recirculating Marangoni flow induced to prevent coffee ring effect. f Optical micrographs and g AFM images of the dried droplets, scale bar, 50 μm. The contrast in f has been enhanced for clarity
