There are hundreds of different ways to prevent this, and PCB surface finishing has become almost an art form itself. Bare copper is famously reactive stuff, and oxides soon form that will make the traces difficult to solder later. Once those traces are formed, however, there’s more work to be done. And it was all made possible by figuring out how to make copper foil stick to a flat board, and how to remove some of it while leaving the rest behind. What was once the work of craftspeople weaving circuits together with discrete components, terminal strips, and wiring harnesses could now be accomplished with dedicated machines, making circuit construction an almost human-free process. There’s no way to overestimate the degree to which the invention of the printed circuit board revolutionized electronics.
Join us on Wednesday, March 11 at noon Pacific for the PCB Finishes Hack Chat with Mark Hughes and Elijah Gracia! Thanks to for the tip! Posted in chemistry hacks Tagged acetone, biosensor, cd, flexible, gold, nature, sensor So, if you have a bunch of CD-Rs laying around, you’re going to need to find something else to do with those instead. The much more common aluminum discs were not tested, but it could be possible with some additional research. The only downside to this method is that it was only tested out on CDs which used gold as the conducting layer. This has been shown to be a much more cost-effective method to produce this type of material when compared to modern production methods, and can also be performed with readily available parts and supplies as well. From there, various cutting tools can be used to create the correct pattern for the substrate of the biosensor. The process involves exposing the CD to acetone for 90 seconds to loosen the material, then transferring the reflective layer to a plastic tape.
One of the more intriguing methods of reprurposing CDs was recently published in Nature, which details a process to harvest and produce flexible biosensors from them. To help keep all of this plastic out of the landfills, many have been attempting to find uses for these old discs. CDs are becoming largely obsolete now, thanks to the speed of the internet and the reliability and low costs of other storage media.
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