Circuits based on flexible substrates have been a hot topic for years in science. Graphene would be a nearly perfect material to use for these circuits, if only we could apply it effectively. While it’s extremely conductive, it’s flaky and difficult to manufacture at scale.
Unlike metal wiring, which you can melt and deposit, graphene doesn’t really melt. Most conductive ink or paint is made with finely powdered metal. When it dries, the metal particles are close enough to pass through a limited amount of current. Graphene sheets don’t self-assemble from a slurry of carbon atoms in solution, though, and if you try to start with big graphene sheets in solution, they tend to clog nozzles. Worse, they don’t dry flat, and that means a tiny conductive cross-section, high resistance, and terrible performance.