Catalyst‐Free Efficient Growth, Orientation and Biosensing Properties of Multilayer Graphene Nanoflake Films with Sharp Edge Planes

Abstract We report a novel microwave plasma enhanced chemical vapor deposition strategy for the efficient synthesis of multilayer graphene nanoflake films (MGNFs) on Si substrates. The constituent graphene nanoflakes have a highly graphitized knife‐edge structure with a 2–3 nm thick sharp edge and show a preferred vertical orientation with respect to the Si substrate as established by near‐edge X‐ray absorption fine structure spectroscopy. The growth rate is approximately 1.6 µm min −1 , which is 10 times faster than the previously reported best value. The MGNFs are shown to demonstrate fast electron‐transfer (ET) kinetics for the Fe(CN) 6 3−/4− redox system and excellent electrocatalytic activity for…