title: Facile photoreduction of graphene oxide by an NAD(P)H model: Hantzsch 1,4-dihydropyridine.
abstract: To make "clean" reduced GO sheets in high quality and in large scale, a natural reduced nicotinamine adenine dinucleotide NAD(P)H model, Hantzsch 1,4-dihydropyridine (HEH), is used as a mild organic photoreductant in this work. Benefiting from the intense absorption of HEH in the range of 300-420 nm, the graphene oxide (GO) can be readily reduced by HEH under UV light irradiation (λ > 320 nm) to afford single or few-layer reduced graphene oxide at room temperature. Studies on reduction extent reveal that both irradiation time and concentration ratio of HEH to GO are important for effective reduction of GO under UV light. The as-prepared photochemically reduced graphene oxide (PRGO) dispersion is stable without the need for any polymeric or surfactant stabilizers. Simply by extraction treatment, the "clean" PRGO sheets can be obtained in large quantities, and its conductivity approaches to 4680 S·m(-1) that is the highest value reported by photochemical approaches so far.
authors.affiliation: Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, the Chinese Academy of Sciences, Beijing, P R China.
authors.forename: Hui-Hui
authors.initials: HH
authors.lastname: Zhang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Liu
authors.forename: Ke
authors.initials: K
authors.lastname: Feng
authors.forename: Bin
authors.initials: B
authors.lastname: Chen
authors.forename: Chen-Ho
authors.initials: CH
authors.lastname: Tung
authors.forename: Li-Zhu
authors.initials: LZ
authors.lastname: Wu
mesh_terms: D004095:Dihydropyridines / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D008958:Models, Molecular; D009249:NADP / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D010316:Particle Size; D055668:Photochemical Processes; D013499:Surface Properties
chemical_list: D004095:Dihydropyridines; D010087:Oxides; D009249:NADP; D006108:Graphite; C038806:1,4-dihydropyridine