Fig. 1: All-carbon memristive synapse prepared by a photo-reduction method.

a Schematic illustration of a biological synapse connecting pre-synaptic and post-synaptic neurons, and the structural diagram of the RGO/GO-NCQDs/graphene memristor. b Schematic illustration of the UV photo-reduction process of the GO-NCQDs nanocomposite. c TEM image of GO-NCQDs nanocomposite. (Inset) Size histogram of the NCQDs. d FT-IR spectrum and e UV–vis absorption spectrum of the prepared NCQDs. f The transient photovoltage curves of the GO-NCQDs films (black circle) and pure NCQDs (red circle).