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Preparation and Properties of Graphene Oxide and Graphene Oxide-based Composites

Author: HanXiao
Tutor: HuLiJiang
School: Harbin Institute of Technology
Course: Inorganic Chemistry
Keywords: Graphene oxide poly(p-phenylenediamine) composite specific capacitance POSS-NH2
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 674
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Abstract


The research of graphene oxide never stopped as soon as it was successfully prepared by Brodie in 19 century. Compared to graphene, the existence of oxygen-contained groups in the structure of graphene oxide makes it owning remarkable hydrophilicity and the graphene oxide-based nanocomposites can be easily prepared by chemical methods. But the solubility of graphene oxide in polar organic solvents is very poor due to its special structure which caused the excellent conductivity lost. In hence, in this paper, two kinds of composites were synthesized by chemical methods using graphene oxide as precursor.We chose improved Hummers method to prepare graphite oxide at first, then was subjected to ultrasonic treatment in H2O to prepare graphene oxide. The result of AFM means the thickness of the graphene oxide sample is 0.9nm and it is considered as single layer graphene oxide. In order to making full use of the special structure of GO, a novel conductive nanocomposite named poly（p-phenylenediamine）/graphene oxide/Au （PpPD/GO/Au） was synthesized via in situ polymerization using p-phenylenediamine（p-PDA） as monomer, HAuCl4 as oxidants and Au sources in the presence of graphene oxide （GO）. The PpPD/GO/Au composite with highest specific capacitance of 237.5F/g was obtained with a mass ratio of p-PDA/GO 20:1 and 100μl addition of HAuCl4 at 0℃for 24h. And the specific capacitance of the composite is much higher than 11.25F/g of individual PpPD. Obviously the specific capacitance of nanocomposite is improved significantly, which shows positive meanings about the adding of Au nanoparticles.In addition ,another novel nanocomposite named POSS-NHCO-GO was synthezied by chemical method and the new structure was proved to be got through the results of FT-IR and XRD. The result of N2 adsorption isotherm revealed that several kinds of pore structures exsit in the structure of the composite. The thermal stability of the composite improved greatly by the results of TG curves compared with GO and POSS-NH2.

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