title: Atomic Oxygen Tailored Graphene Oxide Nanosheets Emissions for Multicolor Cellular Imaging.
abstract: Graphene oxide (GO) has been widely used as a fluorescence quencher, but its luminescent properties, especially tailor-made controlling emission colors, have been seldom reported due to its heterogeneous structures. Herein, we demonstrated a novel chemical oxidative strategy to tune GO emissions from brown to cyan without changing excitation wavelength. The precise tuning is simply achieved by varying reaction times of GO nanosheets in piranha solution, but there is no need for complex chromatography separation procedures. With increasing reaction times, oxygen content on the lattice of GO nanosheets increased, accompanied by the diminution of their sizes and sp(2) conjugation system, resulting in an increase of emissive carbon cluster-like states. Thereby, the luminescent colors of GO were tuned from brown to yellow, green, and cyan, and its fluorescent quantum yields were enhanced. The obtained multicolored fluorescent GO nanosheets would open plenty of novel applications in cellular imaging and multiplex encoding analysis.
authors.affiliation: School of Medical Engineering, Hefei University of Technology , Hefei, Anhui 230009, China.
authors.forename: Qingsong
authors.initials: Q
authors.lastname: Mei
authors.affiliation: School of Medical Engineering, Hefei University of Technology , Hefei, Anhui 230009, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Chen
authors.affiliation: Institute of Intelligent Machines, Chinese Academy of Sciences , Hefei, Anhui 230031, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Institute of Intelligent Machines, Chinese Academy of Sciences , Hefei, Anhui 230031, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Yang
authors.affiliation: Institute of Intelligent Machines, Chinese Academy of Sciences , Hefei, Anhui 230031, China.
authors.forename: Bianhua
authors.initials: B
authors.lastname: Liu
authors.affiliation: Institute of Intelligent Machines, Chinese Academy of Sciences , Hefei, Anhui 230031, China.
authors.forename: Renyong
authors.initials: R
authors.lastname: Liu
authors.affiliation: Institute of Intelligent Machines, Chinese Academy of Sciences , Hefei, Anhui 230031, China.|State Key Laboratories of Transducer Technology, Chinese Academy of Sciences , Hefei, Anhui 230031, China.
authors.forename: Zhongping
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D006108:Graphite / Q000737:chemistry*; D006367:HeLa Cells; D006801:Humans; D008567:Membranes, Artificial; D049329:Nanostructures / Q000737:chemistry*; D061848:Optical Imaging / Q000379:methods*; D010100:Oxygen / Q000737:chemistry*
chemical_list: D008567:Membranes, Artificial; D006108:Graphite; D010100:Oxygen
keywords: atomic oxygen; cellular imaging; emissive carbon cluster; graphene oxide; multicolored emission