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Silver nanowires have drawn significant interest in recent years for use in many applications, ranging from prosthetic devices to wearable health sensors, due to their flexibility, stretchability and conductive properties. While proof-of-concept experiments have been promising, there have been significant challenges to printing highly integrated circuits using silver nanowires.
Silver nanoparticles can be used to print circuits, but the nanoparticles produce circuits that are more brittle and less conductive than silver nanowires. But conventional techniques for printing circuits don't work well with silver nanowires; the nanowires often clog the printing nozzles.
Approach - Printing - Force - Ink - Nozzle
"Our approach uses electrohydrodynamic printing, which relies on electrostatic force to eject the ink from the nozzle and draw it to the appropriate site on the substrate," says Jingyan Dong, co-corresponding author of a paper on the work and an associate professor in NC State's Edward P. Fitts Department of Industrial & Systems Engineering. "This approach allows us to use a very wide nozzle -- which prevents clogging -- while retaining very fine printing resolution."
"And because our 'ink' consists of a solvent containing silver nanowires that are typically more than 20 micrometers long,...
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