Figure 14. The electrical device only rotates if the electrical circuit is closed with the photochemically reduced graphene (3.-4.). Graphene oxide works as an electrical insulator (1.-2.)

From

Graphene – Exciting Insights into the Synthesis and Chemistry of the Miracle Material of the 21st Century and Its Implementation in Chemistry Lessons for the First Time

Andreas Schedy, Dominik Quarthal, Marco Oetken

World Journal of Chemical Education. 2018, 6(1), 43-53 doi:10.12691/wjce-6-1-8