The Preparation And Characterization Of Polymer-semiconductor Nanoparticle Composite Film

Though there are many methods for preparation, the semiconductornano-material can not be widely used because of its minor size, high surface energyand easy aggregation. If semiconductor nano-material is integrated with polymer, thepolymer can act as a carrier to control the size and distribution of particles and toincrease the stability. Moreover, the characteristic of particles can be used formaterial only by compounding and assembling with other bulk materials. Thepolymer gains an advantage over other materials in compounding and assemblingwith semiconductor nanoparticles for its well worked ability, The composite film canbe widely used as novel nonlinear optical material, electroluminescent materal, laseramplifer, and so on. So the interest in the development of polymer-semiconductornanoparticle composite film has grown exponentially in recent years.The composite films of nanostructured semiconductor (ZnO, ZnS and CdS) inpolymers with different sizes were synthesized with in-situ route at low temperaturethough changing processing parameters. The products were characterized by X-raydiffraction (XRD), transmission electron microscopy (TEM), ultraviolet-visibleabsorption spectrum (UV-VIS), photoluminescence spectrum (PL) and differentialscanning calorimetry (DSC). The effects of processing parameters (washing ways, thetime of ageing and ultra-acoustic disperse, the time and temperature of heat treatment,the time of regurgitation, reaction temperature, the concentration of reactant andresultant) on size of resultion products were studied. The results indicate that washing ways, ageing time, the time treated byultra-acoustic disperse, the time and temperature of heat treatment, and theconcentration of ZnO will affect the size of ZnO in the system of Zn(OH)₂-PES(PVDF);reaction temperature, the concentration of reactant and resultant will lead tochange in size of ZnS, CdS size in the system of ZnS-PES and CdS-PES. Themorphologies and the crystal structure of the composite films are study show thatblue shifts of the absorption edges and photoluminescence peaks become distinct withthe decrease of semiconductor nano-crystals sizes. Meanwhile, the result of DSCshows that the crystal properties of PVDF will benefit from the entering ZnO.