title: Metal ion-directed solution-phase tailoring: from large-area graphene oxide into nanoscale pieces.
abstract: Due to fascinating electronic properties and great potential in various applications, graphene has attracted great interest. Recently, much work have focused on the synthesis of different sizes and properties of graphene or graphene oxides (GOs), for example, graphene nanoribbons, nanosized graphene pieces, and nanosized triangular and hexagonal graphene sheets terminated by zigzag edges. Herein, we have demonstrated a widely available approach to fabricate the nanoscale GO pieces by directly solution-phase cutting a large-area GO sheet into nanoscale pieces via spontaneous redox reactions at room temperature. In this process, GO acts with dual functions as a model and a reducing reagent. With a typical example of silver ions, we have investigated in detail the influence of the reaction time and concentration of metal ions on yield and size of nanoscale GO pieces. Moreover, we also obtain Ag nanoparticle coating on the GO surface. Finally, a possible mechanism is suggested to explain the formation of nanoscale GO pieces.
authors.affiliation: Department of Bio-Nano-Science and Engineering, Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Institute of Micro-Nano Science and Technology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China. gxshen@sjtu.edu.cn.
authors.forename: Xiansong
authors.initials: X
authors.lastname: Wang
authors.forename: Peng
authors.initials: P
authors.lastname: Huang
authors.forename: Huiyang
authors.initials: H
authors.lastname: Liu
authors.forename: Chao
authors.initials: C
authors.lastname: Li
authors.forename: Guangxia
authors.initials: G
authors.lastname: Shen
authors.forename: Daxiang
authors.initials: D
authors.lastname: Cui