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石墨烯最新发现,荧光石墨烯,可用作生物传感器,检测多肽,蛋白质和DNA 已有24人参与
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Photoluminescent Graphene Oxide Ink to Print Sensors onto Microporous Membranes for Versatile Visualization Bioassays Herein, we report photoluminescent graphene oxide (GO) paper-like sensors for the ultrasensitive visual bioassays of peptide, protein, and DNA. GO nanosheets are a two dimensional oxidized derivative of graphene, which can be easily exfoliated from graphite in high yield under simple oxidizing conditions. Owing to the huge surface area and a thickness of several nanometers,the ultrathin flexible nanosheets can easily be assembled into the form of paper sheets or directly fabricated on solid substrates. Furthermore, GO bears numerous phenol hydroxy and epoxy groups at the basal plane and carboxylic groups at the lateral edge,thus providing the direct interaction with biological species and the flexibility of chemical modification. In principle, these features make GO nanosheets an excellent candidate as basic materials for paper chemosensors. How- ever, common GO nanosheets possess a finite electronic bandgap and are usually used as a highly efficient fluores- cence quencher in many reported biosensors. The lack of signal output capability greatly limit application in colori- metric paper sensors. On the other hand, unmodified GO nanosheets can emit a weak fluorescence at about 550 nm. In recent work, highly photoluminescent GO nanosheets were successfully synthesized through the amine reaction and ring-opening amination at the surface of GO nanosheets. The emissive peak at 440 nm exhibits a large blue-shift relative to that of pure GO. Generally, the weak emissions of GO are attributed to a large number of conjugated aromatic sp2 clusters at GO nanosheets. When the epoxy rings at GO nanosheets are opened by the present amination reaction, the degree of sp2 conjugation will largely be reduced, making the emissive peak exhibit a large blue shift. |
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2012-05-11 08:48:24, 1.16 M
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