Wiping out coffee-ring effect advances inkjet printing of electronic circuits

Their study, which describes development of a new method for producing straighter, uniform circuits using inkjet-printing, is scheduled for the March 4 issue of ACS’ Langmuir, a bi-weekly publication.

In the report, Dan Soltman and Vivek Subramanian note that inkjet-printed circuits must be extremely smooth and straight. That difficult feat has been elusive because the drop-by-drop nature of inkjet-printing often leaves uneven printed features on surfaces, especially a circular pattern known as the “coffee ring” effect, they note.

The scientists describe a new way to optimize printing conditions to eliminate the coffee-ring effect and produce smooth, narrow lines with an even edge. The development demonstrates the feasibility of tuning and optimizing inkjet technology for microelectronic applications, they say.-American Chemical Society