The invention provides a method for preparing single-layer
graphene. The method includes the steps that
mineral acid,
benzene sulfonic acid sodium salt and peroxybenzoic acid are added to
graphite, a reaction is conducted at the
reaction temperature of 20-30 DEG C, then KMnO4 is added, after the mixture is stirred to be uniform, a reaction is conducted at the
reaction temperature of 60-65 DEG C, and a claybank solution is obtained; water is added to the claybank solution to conduct
dilution, then H2O2 is added till the solution becomes luminous yellow, then filtering is conducted, ethyl
alcohol is added to filtrate, the mixture is stirred to be uniform, after filtering is conducted, a
filter cake is subjected to acid
pickling and then subjected to
water washing till the
filter cake is neutral, and
graphite oxide is obtained; ethidene
diamine is added to the
graphite oxide, and after a reaction is conducted in an ultrasonic reactor, the single-layer
graphene is obtained. The
graphene obtained through the method is small in number of
layers and not prone to agglomeration, and the problems that the single-layer graphene is stacked again under a
natural state, and the surface of the single-layer graphene absorbs
oxygen are solved. The one-step stripping and reducing method for preparing the graphene is
environmentally friendly and simple,
time cost and production cost are saved, large-scale production and application can be achieved, and the method has a wide industrial application prospect.