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Highly oxidized graphene with enhanced fluorescence and its direct fluorescence visualization

Highly oxidized graphene with enhanced fluorescence and its direct fluorescence visualization
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摘要 We prepared hyper-oxidized graphene(HOG) as a form of graphene derivative by additional oxidation of graphene oxide(GO) sheets. HOG, which formed more functional groups and isolated conjugated clusters on the sheets, accordingly showed high solubility in water and alcohols, high transmittance and film transparence, longer fluorescence decay constant time, and enhanced fluorescence in states of solution and solid. By contrast, GO has much weaker fluorescence in solution and its fluorescence is totally quenched in solid. The influences of concentration, metallic ions, and pH on HOG fluorescence in aqueous solution were also investigated in detail. Due to HOG's strong fluorescence, direct visualization was realized on substrates and in solution. In addition, direct 3D fluorescence visualizations of HOG phase in polymer composites were achieved. These results show the great potential of HOG in a broad range of applications, from biological labeling, probes, and drug carriers to highperformance composites and nanomanipulation. We prepared hyper-oxidized graphene (HOG) as a form of graphene derivative by additional oxidation of graphene oxide (GO) sheets. HOG, which formed more functional groups and isolated conjugated clusters on the sheets, accordingly showed high solubility in water and alcohols, high transmittance and film transparence, longer fluorescence decay constant time, and en- hanced fluorescence in states of solution and solid. By contrast, GO has much weaker fluorescence in solution and its fluores- cence is totally quenched in solid. The influences of concentration, metallic ions, and pH on HOG fluorescence in aqueous so- lution were also investigated in detail. Due to HOG's strong fluorescence, direct visualization was realized on substrates and in solution. In addition, direct 3D fluorescence visualizations of HOG phase in polymer composites were achieved. These results show the great potential of HOG in a broad range of applications, from biological labeling, probes, and drug carriers to high- performance composites and nanomanipulation.
出处 《Science China Chemistry》 SCIE EI CAS 2014年第4期605-614,共10页 中国科学(化学英文版)
基金 supported by the National Natural Science Foundation of China(51173162,21325417) Qianjiang Talent Foundation of Zhejiang Province(2010R10021) Fundamental Research Funds for the Central Universities(2013XZZX003) Research Fund for the Doctoral Program of Higher Education of China(20100101110049) Zhejiang Provincial Natural Science Foundation of China(R4110175)
关键词 highly oxidized graphene enhanced fluorescence fluorescent visualization 三维荧光 氧化石墨 可视化 高分子复合材料 高性能复合材料 水溶液 衰减常数 金属离子
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