| In recent years, more and more attention has been paid to the application ofpolymer-ferrites nanocomposite materials by researchers. Polystyrene (PS), as a kindof polymer material with the disconjugated structure of the main chain, has thecharacteristics of good transparency, excellent electrical insulation, shaping easily andet al, and thus widely used in electronics packaging, architecture and instrument fields.As a member of conducting polymer family, polyaniline (PANI) with conjugatedstructure shows great prospects and application value in electromagnetic compositematerials.At present, the polymer-ferrites nanocomposite materials are mainly synthesizedthrough “two-step method”. Firstly, the ferrites nanoparticles are prepared by usingsol-gel method, hydrothermal method, coprecipitation method and et al. Then, themonomer is dispersed in the suspension of inorganic materials and thepolymer-ferrites nanocomposite materials are prepared via in-suit polymerization.However, the relatively complex schedules and long reaction times involved in theirpreparation are common problems and restrict the mass production and large-scaleapplication. One-step method, which possesses the advantages of easy operation,short schedules, relatively easy transferring generation and so on, can well solve theabove problems. Based on it, in this article, we designed a novel one-stepsolvothermal method, and successfully synthesized CoFe2O4nanoparticle,PS-CoFe2O4nanocomposite materials and PANI-CoFe2O4nanocomposite materials.Simultaneously, we discussed the preparation condition of these materials and theeffect of the amount of monomer on the magnetic and electric properties of them.The article mainly contains the following three parts:1. The CoFe2O4magnetic nanoparticles were prepared by solvothermal methodat different temperatures. The structure, morphology and magnetic properties wereinvestigated with the help of XRD, SEM, TEM and VSM techniques. The resultsshowed that the as-prepared nanoparticles exhibited the heavy agglomeration, themagnetization (M) changed not obviously with increasing the solvothermaltemperature while the coercive force (Hc) increased with the increase of reaction temperature and the maximum value reached103.6Oe at180oC.2. A one-step solvothermal method was firstly carried out to successfullyprepared PS-CoFe2O4nanocomposite materials with different amount of polystyreneat the conditions of with and without initiator K2S2O8(KPS) and the PS-CoFe2O4nanocomposite materials were investiged by XRD, TEM, FT-IR, TGA and VSMtechniques. The results indicated the successful combination of PS and CoFe2O4viathis novel method. Adding nonmagnetic PS could improve the crystallinity ofCoFe2O4. Simultaneously, the contribution of hybrid nanostructures made thePS-CoFe2O4nanocomposite material prepared without K2S2O8present supercoercivity than pure CoFe2O4and the maximum value was up to437.47Oe at180oC.3. PANI-CoFe2O4nanocomposite materials with different amount of polyanilinewere firstly prepared via the one-step solvothermal method at the base condition. Thecharacteristic results revealed that the existence of CoFe2O4could improve thethermal stability. The hybrid nanostructure, good crystallinity and possibleelectromagnetic interaction could make the coercivity of nanocomposite materialsincrease eleven times more than pure CoFe2O4. Simultaneously, the nanocompositematerials were soaked in a certain concentration of hydrochloric acid solution (acidtreatment/protons) to obtain acid doped PANI-CoFe2O4nanocomposite materials. Theelectrochemistry property results indicated that the PANI-CoFe2O4nanocompositematerials with acid treatment presented better electrochemistry property than thoseprepared at base condition. |
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