Researchers at Dublin City University (DCU), led by materials scientist Conor Boland, have shown that graphene can be produced from electronic-waste graphite using little more than a kitchen blender, waste newspaper and ordinary tap water, extending the group's earlier household-graphene work to waste-derived starting materials as well as waste-derived processing.
The starting point is the graphite heat spreaders found inside phones, laptops and other devices, which draw heat away from components and typically become electronic waste once a device reaches end of life. Around 62 million tonnes of e-waste were generated globally in 2022, of which only 22.3% was documented as properly collected and recycled, and the researchers note that graphite tends to get overlooked next to the metals that dominate e-waste recovery efforts. Chemically, that discarded graphite is no different from the graphite used to make graphene, which consists of single-atom-thick carbon sheets stacked like a deck of cards.
To pull those sheets apart, the team used liquid-phase exfoliation, an Irish-pioneered technique in which graphite is dispersed in a liquid and enough energy is applied to break the stacked layers apart - in this case, from an ordinary kitchen blender, with a kitchen sieve used to filter out unexfoliated lumps. The harder problem is keeping the separated sheets from restacking once they're apart, which researchers normally address with specialist solvents or stabilizing chemicals. Here, the team instead washed and softened old newspaper in tap water and blended it into a fiber-rich liquid; the cellulose in the newspaper acted as a temporary barrier between the freshly separated graphene sheets. Without it, the processed material settled out of the water within minutes; with it, the suspension stayed usable for several hours and could be redispersed with a simple shake.
Most of the experiments used a commercial version of the graphite heat-spreading material, since a single phone contains only a small amount of it, but the team also disassembled a discarded smartphone and recovered enough graphite from it to show that genuine e-waste material could likewise be broken down into thin carbon sheets. Confirming that the resulting material was in fact graphene still required standard laboratory characterization equipment at DCU.
The work builds on the group's earlier "Hometronics" study, which showed graphene could be made from pencil lead, tap water, soap and coffee filters. "We needed sophisticated scientific equipment to prove that we'd made graphene, but actually making it was the accessible bit," said Boland. The researchers frame the approach not as a replacement for factory-scale graphene production, but as a way to lower the barrier to graphene research for labs with tight budgets, schools and citizen-science projects - letting local, low-cost processing produce material that a university or shared facility then verifies with advanced measurements, rather than requiring expensive equipment just to get started.
