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Designs, Synthesis, Characterization and Direct Electrochemistry of Zinc-porphyrin Noncovalent Functionalized Graphene Oxide Sheet

Author: BiChun
Tutor: YinGui
School: Nanjing University
Course: Organic Chemistry
Keywords: Graphite oxide Composites Noncovalent Porphyrin A photoelectric conversion material Graphite Graphite oxide Carbon Nanotubes Metal nanoparticles Surface electronic structure AFM π-π interactions Solar Fullerenes One-dimensional Materials Science Determination of nature Conductivity Organic dyes Synthesis
CLC: TB383
Type: Master's thesis
Year: 2012
Downloads: 321
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Abstract


Recently, a lot of research effort has been devoted to understanding the physico-chemical properties of the carbon allotrope-grapheme with an atomically thin,2D structure that consist of sp2-hybridized carbons, exhibits remarkable electronic and mechanical properties. Theoretically, the molecules of other allotropic carbon forms can be built from graphene. For example it can be stacked to form3D graphite, rolled to form ID nanotubes, and wrapped to form OD fullerenes. Usually, graphene oxide (GO) can be easily deposited on different substrates to produce continuous films for the construction of transparent conductors, Photovoltaic devices, and biosensors, and hydroxyl groups at the basal planes of GO sheets, which is responsible for the for-mation of stable aqueous dispersions of GO.A number of types of covalently functionalized GO have been prepared by utiliz-ing the above functional groups. Such modified GO can be also applied as elec-tron-accepting material in organic solar cells due to its unique structure and excellent electronic properties. The interesting aspect attracting us is the noncovalent function-alization of GO, with planar organic molecules via π-π stacking, van der Waals, and/or electros static forces. In addition, owing to appropriate LUMO and HOMO energy levels and very strong absorption of the Soret band in the400-450nm region, as well as the Q-band in the500-700nm region, porphyrin derivatives should have better performance and more stable than other dye molecular as photoelectronic materials. More importantly, this easy method can endow GO with designed optoelectronic properties when it is combined with planar aromatic molecules such as porphyrins. Owing to the interaction between porphyrin molecular and GO surface is so weak, the researchers has the obstruction to preparing the porphyrin/GO hybrid.To accomplish this, We have designed and synthesis a new compound of Zinc-Porphyrin bearing four pyrene groups (ZnP-t-P(py)4) and prepared a new hybrid materials of ZnP-t-P(py)4with graphene oxide (GO) via non-covalent interactions. The ZnP-t-P(py)4, along with four pendant pyrene entities ZnP-t-P(py)4, stacking on the (GO) surface due to π-π interactions, being revealed by AFM measurements. FTIR, UV-vis absorption confirm the non-covalent functionalization of the GO. Raman spectral measurements revealed the electronic structure of the GO to be intact upon hybrid formation. In this donor-acceptor nanohybrid, the fluorescence of photoexcited ZnP-t-P(py)4is effectively quenched by a possible electron-transfer process. The fluorescence and photoelectrical response measurements also showed that this hybrid may act as an efficient photoelectric conversion material for optoelec-tronic applications.

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