Preparing And Structure Of Nanocomposites Of ZnS, ZnSe/ Polymer Nanofibers

Nanofibers of polyacrylonitrile were got by electrospinning. ZnSe/ polyacrylonitrile fiber nanocomposites were prepared by hydrothermal in diethylene triamine / deionized water solvent mixtures at 180℃for 6h.Since spinning polyacrylonitrile materials which were acidic containing a certain amount of itaconic acid, Zn²⁺ coordinated with carboxyl, then grew up by bonding Se^2- through covalent effect to yield ZnSe. The samples were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), and the PL of nanocomposites blanket were analyzed by fluorescence. The products would be got with complex topography. Both nanorods with 10-100nm in diameter 50-500nm in length and micron blooms with diameter of 4-10um were got. The emission spectrum of the nanocomposites at an excitation wavelength of 260nm gave a small peak at 352nm and a high-wide peak at 427nm at room temperature, which all showed blue shift in respect to bulk ZnSe of 468nm. ZnSe prepared by this method may have potential applications in light-emission optoelectronic devices. Diethylene triamine had good control of the synthesizing of ZnSe nanocrystal, but the condition of high temperature and strong alkalescence had negative influence on the morphology of nanofibers.PAN and MMA-BMA-AA nanofibers whose diameter were about 200nm could be electrospun by optimize technics summed by experiment. Introduce zinc ions to coordinate with carboxyl which were in AA.We presented a novel route for fabricating ZnS nanoparticles on the surface of PAN and MMA-BMA-AA copolymer nanofibers. The photoluminescence spectrum of ZnS / PAN and MMA-BMA-AA nanofibers had a 80 nm blue shift compared with that of corresponding bulk ZnS sample. The polymer nanofibers enhanced the quantum effects of the ZnS nanoparticles. The ZnS / PAN and MMA-BMA-AA nanocomposites had high photocatalytic activity for degradation of phenol under ultraviolet irradiation, it could be used repeatedly 6 times with indistinctive change of photocatalytic activity. The nanofibers of PAN and MMA-BMA-AA not only disperse but also stabilize the ZnS nanoparticles.The NaHSe aqueous solution was used as the Se south. ZnSe nanoparticles whose diameter ranged from 20 to 40nm were well-proportioned distributed on the surface of PAN and MMA-BMA-AA nanofibers. The photoluminescence spectrum of ZnSe / PAN and MMA-BMA-AA nanofibers had a 80 nm blue shift compared with that of corresponding bulk ZnSe sample. The results showed strong quantum effects of ZnSe nanoparticles.There were still some Zn²⁺ ions coordinated with carboxyl of the MMA-BMA-AA copolymer. That is why the amount of Zn atoms is larger than that of S atoms in ZnS / PAN and MMA-BMA-AA nanocomposites and of Se atoms in ZnSe / PAN and MMA-BMA-AA nanocomposites.