title: Observing the Heterogeneous Electro-redox of Individual Single-Layer Graphene Sheets.
abstract: Electro-redox-induced heterogeneous fluorescence of an individual single-layer graphene sheet was observed in real time by a total internal reflection fluorescence microscope. It was found that the fluorescence intensity of an individual sheet can be tuned reversibly by applying periodic voltages to control the redox degree of graphene sheets. Accordingly, the oxidation and reduction kinetics of an individual single-layer graphene sheet was studied at different voltages. The electro-redox-induced reversible variation of fluorescence intensity of individual sheets indicates a reversible band gap tuning strategy. Furthermore, correlation analysis of redox rate constants on individual graphene sheets revealed a redox-induced spatiotemporal heterogeneity or dynamics of graphene sheets. The observed controllable redox kinetics can rationally guide the precise band gap tuning of individual graphene sheets and then help their extensive applications in optoelectronics and devices for renewable energy.
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry and Jilin Province Key Laboratory of Low Carbon Chemical Power, Changchun Institute of Applied Chemistry, Chinese Academy of Science , 5625 Renmin Street, Changchun 130022, China.|Graduate University of Chinese Academy of Science , Beijing 100049, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry and Jilin Province Key Laboratory of Low Carbon Chemical Power, Changchun Institute of Applied Chemistry, Chinese Academy of Science , 5625 Renmin Street, Changchun 130022, China.
authors.forename: Yuwei
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry and Jilin Province Key Laboratory of Low Carbon Chemical Power, Changchun Institute of Applied Chemistry, Chinese Academy of Science , 5625 Renmin Street, Changchun 130022, China.
authors.forename: Weilin
authors.initials: W
authors.lastname: Xu
keywords: electro-redox; fluorescence; fluorescence microscopy; graphene oxide