The 'wonder material' graphene can be made using a kitchen blender, a mobile phone and a newspaper

Graphene from a Kitchen Blender: Researchers Turn E-Waste and Newspaper into 'Wonder Material'

There is something slightly ridiculous about using a kitchen blender to make graphene, as researchers at Dublin City University (DCU) would be the first to admit. Graphene, often called a "wonder material," is many times stronger than steel yet lighter than paper or aluminum, and it conducts electricity exceptionally well. Since its discovery just over two decades ago, it has found uses in power banks, batteries, medical sensors, and even stronger concrete. Its production typically requires purified graphite, specialized solvents, ultrapure water, and carefully controlled processing. But a team led by materials scientist Conor Boland has shown that useful graphene can be made with little more than a kitchen blender, waste newspaper, and ordinary tap water, starting from graphite found in electronic waste.

From E-Waste to Graphene

The starting point is the graphite heat spreaders found inside phones, laptops, and other devices. These thin sheets draw heat away from components and usually end up as electronic waste when a device reaches the end of its life. 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.

The scale of the electronic waste problem is enormous. Around 62 million tonnes (or metric tons) of e-waste were generated globally in 2022, yet only 22.3% was documented as properly collected and recycled. Valuable metals understandably attract much of the attention in e-waste recovery, but the researchers note that graphite tends to get overlooked next to the metals that dominate those efforts.

The Blender Method

To pull the graphite 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, the energy came from an ordinary kitchen blender, with a kitchen sieve used to filter out lumps that hadn't been properly broken down.

The harder problem is keeping the separated sheets from restacking once they're apart. Researchers normally address this 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. Newspaper is rich in cellulose, the structural material found in plant fiber, and the cellulose acted as a temporary barrier between the freshly separated graphene sheets. Without the newspaper-derived material, the processed material settled out of the water within minutes. With it, the suspension remained usable for several hours and could be redispersed with a simple shake.

Proof and Practicality

Most of the experiments used a commercial version of the graphite heat-spreading material, but the team also took apart a discarded smartphone and recovered some of its graphite. They showed 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 sophisticated laboratory equipment at Dublin City University. As Boland put it: "We needed sophisticated scientific equipment to prove that we'd made graphene, but actually making it was the accessible bit."

The work builds on the group's earlier "Hometronics" study, which showed that graphene could be made from pencil lead, tap water, soap, kitchen appliances, and even coffee filters. The latest research, published in ACS Sustainable Resource Management, extends that approach to waste-derived starting materials as well as waste-derived processing.

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. A discarded phone, yesterday's newspaper, tap water, and a blender won't replace a graphene factory, they acknowledge, but the method could make graphene research a little less exclusive.