A group of scientists from Rice University has developed a technology for applying graphene labels to various surfaces - in particular, on food products. The secret is that almost any product containing carbon can be turned into graphene. The scientists used a defocused laser beam as a "magic wand".
The targets were paper, cardboard, cork, charcoal, freshly toasted bread toast, coconut shells and potato skins.
In this case, a complex organic carbon-containing polymer lignin, which forms a graphene label under the influence of a laser, has become a kind of "ink".
According to scientists, graphene obtained by this method will find its application as an electrocatalyst for fuel cells, biosensors and RFID tags. They will also be able to replace traditional food and clothing labeling.
Another unique quality of graphene sensors is the recognition of various microorganisms. For example, having detected E. coli, such a mark will begin to glow.