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Designs and Applications of EHD 3D Printing

A B

C D

E F

Figure 4. (A) Polyurethane etch resist for a circuit is printed by electrohydrodynamic (EHD) before etching the metal layer. (B) EHD printed
array of source or drain electrode pairs after deposition of resist layer, etching of metal, and stripping the resist (adapted from Park et al. ).
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(C) Surface morphology of the edge of the silver tracks scanned by scanning electron microscope at a magnification of ×5000 (adapted from
Wang et al.). (D) A printed coated resistor. (E) A printed interdigitated capacitor. (F) A printed spiral inductor (adapted from Wang et al. ).
[30]
ink without any particle structure, on the substrate, and boards and backplanes of printable transistors . Since
[27]
a photo-curable polymer droplet was printed at two noble nanoparticles, such as gold and silver, have good
intersecting conductive lines as isolating points . electrical conductivity and non-oxidizing properties, their
[11]
The latter material, which is a liquid ink containing colloidal solution is firstly applied in the application of
metal nanoparticles, is usually directly deposited on the electronics. Khan et al. used a multinozzle to print three
substrate; then, heating the metal nanoparticles makes parallel conductive lines made out of colloidal solution
them connect to each other. Heating process helps those containing silver particles and the width of line is about
particles to remove cover and form a continuous dense 140 µm. After sintering at 250°C for 1 h at a constant
metal structures. EHD inkjet printing is able to print heating rate of 2°C/min, the resistivity of silver line is
conductive lines for metallization in printed circuit 5.05 × 10 Ω m, 3 times higher than the resistivity of
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6 International Journal of Bioprinting (2019)–Volume 5, Issue 1