Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 16, Issue 35, Pages 10771-10777Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201000620
Keywords
electrochemistry; graphene; nanostructures; pi interactions; porphyrinoids
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Funding
- National Basic Research Program of China [2010CB732400]
- National Natural Science Foundation of China [90713015, 20835006, 20875044, 20705012]
- National Science Funds for Creative Research Groups [20821063]
- PhD Fund for Young Teachers [20070284052]
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Reduced graphene oxide (RGO) was prepared and functionalized with picket-fence porphyrin, 5,10,15,20-tetrakis [alpha alpha alpha alpha-2-trismethyl-ammoniomethylphenyl] porphyrin iron(III) pentachloride (FeTMAPP), through pi-pi interactions. The resulting nanocomposite was characterized by atomic force microscopy (AFM); transmission electron microscopy (TEM); contact angle measurements; and fluorescence, Raman, and UV/Vis absorption spectroscopy. On account of the introduction of positively charged FeTMAPP, the functionalized RGO showed good dispersion in aqueous solution. The RGO could greatly accelerate the electron transfer of FeTMAPP to produce a well-defined redox couple of Fe-III/Fe-II at -0.291 and -0.314 V. Due to the synergic effect between RGO and the porphyrin, the nanocomposite showed excellent electrocatalytic activity toward the reduction of chlorite, thus leading to highly sensitive amperometric biosensing at low applied potential. The biosensor for chlorite showed a linear range from 5.0x10(-8) to 1.2x10(-4) mol L-1 with a detection limit of 2.4x10(-8) mol L-1 at a signal-to-noise ratio of 3. The picket-fence porphyrin could serve as an efficient species to functionalize graphene for electronic and optical applications.
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