After graphene was first produced at the University of Manchester in 2004, it was hailed as a wonder material, stronger than steel but lighter than paper. But two decades on, not every UK graphene company has made the most of that potential. Some show promise but others are struggling.Extracted from graphite, commonly used in pencils, graphene is a latticed sheet of carbon one atom thick, and is highly effective at conducting heat and electricity. China is the world’s biggest producer, using it ...