Figure 5.
Roll-to-roll inkjet printing for hybrid bioelectronics. (a) Illustration of CIJ (left) and DOD (right) inkjet printing techniques. (reprinted with permission from Micromachines (2017), 8(6), 194. Copyright 2017, MDPI). (b) Reynolds number and Ohnesorge numbers that yield a high-quality inkjet deposition. Weber numbers can be calculated based on the ratio /Re. (c) Example images and illustrations of coffee ring formation due to capillary flow in evaporating droplets (i,vi–viii). This is compared to uniform depositions produced with added DTAB to promote particle trapping at the liquid–gas interface, which created particle skins that lead to homogenous disk like patterns upon drying (ii–v). (reprinted with permission from Langmuir (2015), 31, 14, 4113–4120, Copyright 2015, ACS). (d) Illustration of the dual drop inkjet printing process, where the blue ink is the supporting droplet, the red ink is the wetting droplet, and the gold represents the nanoparticles to be deposited. (reprinted with permission from Adv. Mater. Interfaces (2018), 5, 1701561. Copyright 2018, Wiley). (e) Illustration of the dual drop process used to deposit a uniform nanoparticle monolayer. (reprinted with permission from Adv. Mater. Interfaces (2018), 5, 1701561. Copyright 2018, Wiley).