Laser Writing Graphite Conducting Lines
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-31
A thin film circuit can be generated by writing lines directly on a substrate from a previously coated dry graphite coating. A substrate, e.g., an insulating substrate, is immersed in a solution of graphite. A graphite coating settles on the substrate surface. The substrate is moved from the solution. The coating is dried, e.g., by hot plate heating for about 30 seconds at 40oC. A laser, e.g., argon laser, is selectively focused onto the graphite coating which forms conducting lines from the graphite. The remainder of the settled graphite coating is removed, for example in an agitated alcohol bath.