Preparation Of Polyanilion/(Oxide) Graphene Composite Material And Study Of Their Electrical Properties

Graphene, which is accumulated by carbon atom, is a kind of carbon materialconsisted by a two-dimensional honeycomb crystal structure. Because of its specialproperties, graphene has been the hottest research in the Material Science, theCondensed Physics and many other areas. Polyanilion, which possess goodelectrochemistry reversibility, good thermal stability and special doped&doped-offphenomenon, has become one of the fastest developing material of conductivepolymers.In this paper, we discussed the research about the synthesis and electricproperties of polyanilion(PANI)（/oxided-）graphene(GE) composite material, throughstuding the influence of different doped acids and different solvent system to thecomposite material, and explored a new method of prepare reduced GEO,also studiedthe effect of this change to the PANI/GEO composite material.The detials are asfollows:(1)The optimization of the reaction condition of PANI/GEO: The surface ofGEO contains a lot of functional group, such as hydroxyl group, epoxy and carboxylgroup and so on, this special group can keep the solution stable, absorb monomer, andprovide the growing point to the monomer. Taking the method of in-situpolymerization, introducing the GEO to the anilion, then synthesized the PANI/GEOcomposite material, which was used as electrode material of electrochemicalcapacitor with good electric properties. According to the experiment,the mostsuitable time and temperature of this experiment is6h and0℃. And under thiscondition, we have tested the electrochemical properties, by the scan rate of50mv/s,the specific capacitance can reach472.2F/g, it can show good electric properties.(2)The influence of three kinds of different doping acid (acids-hydrochloricacid(HCl), benzene sulfonic acid and p-toluene sulfonic acid) to the electricproperties of PANI/GEO: We have had the electric tests of the PANI/GEO with thedoping and co-doping of the three kinds of acid. From the results, we found that theHCl has the best doping effects, with the scan rate of10mv/s, the specific capacitance can reach553.8F/g.(3)On the basis of previous research, That the influence of four kinds of solventsystem with different solubility parameter to the electric properties ofPANI/GEO(acetone, ethanol, ethyleneglycol, dimethyformamide) was discused.the effects to the electric properties by different volume ratio was also studied. Via theresults, it was showed that, when the PANI/GEO in the acetone system with theratio of Vacetone:Vwater=3:10, it could obtain excellent electrical property and showsgood cycling stability, under the scan rate of50mv/s, the specific capacitance canreach662.3F/g,it exhibited the characteristics of the hybrid capacitor.(4)The exploring of a new method of preparation of reducingoxided-graphene(GEO): In this paper, we introduced a new, environmental andnontoxic reductant-tara powder. The GEO reduced by tara powder can stay a longtime(more than half a month) without agglomeration. And we also did theoptimization of the reaction condition, after a certain amount of testing, we found thatthe most suitable time and temperature is6h and80℃. The specific surface area is389.4m2/g. Compared with the specific surface area of GE reduced byhydrazine(1029.7m2/g), the Tara powder can reduce the GEO partly, but thegraphene solution can stay stable for a relatively long time.(5)Compare the electrical property of PANI/GE-1(reduced by tara powder) tothat of PANI/GE-2(reduced by hydrazine), we could know that: under the scan rate of30mv/s, the PANI/GE-1’specific capacitance can only reach to263.7F/g, but underthe same condition the PANI/GE-2’specific capacitance can reach to683.6F/g. So, tothe electrode material, the GE-2contribute much more to the electric property thanthat of GE-1.