▎ 摘　　要

A possible chemical route towards the formation of graphene is via water soluble graphite oxide (GO), which can be reduced chemically or thermally to carbon. GO prepared by Hummer's method is shown to be EPR-active with similar to 10(16) electron spins/g. Heating GO increased the free radical concentration at similar to 140 degrees C, together with the elimination of CO2 and water, and finally produced black, diamagnetic graphitic material at high temperature. Significant loss of carbon in the thermal process implies that the chemical route to graphene via Hummer's GO is less attractive.