The discs appear to serve only as a temporary platter for holding the graphite oxide film. Once scribed by a laser, the graphite oxide is converted to graphene

The discs appear to serve only as a temporary platter for holding the graphite oxide film. Once scribed by a laser, the graphite oxide is converted to graphene and peeled from the disc for further processing. The discs aren't used in the capacitors. The article says that blank discs are used, but doesn't mention if they are reused or even if they must be blank, but I get the impression that a viable method of production probably won't depend on wasting disposable discs.