Synthesis And Property Studies Of Nanocomposite Materials

In the field of nanomaterial research,nanomaterials are the most dynamic and close to the practical application,and it is the material basis of the integration of chemistry,biology,physics,medicine and other disciplines,and it has great influence on the development of society and economy.Multifunctional nanomaterial with low-dimensional and intelligent features have received considerable attention in recent years.They not only have the special properties of nanomaterial,but also can acquire optimized optical,electrical,magnetic,and biological properties by combining the respective function of different component organically,and meanwhile keep their original physical and chemical characteristics maintained.They have the advantages of both the nanomaterial and functional material,so they have become one of the most promising materials,and exhibit great potential in many applications,such as biology,medicine,chemistry,environment,energy and other areas.Aiming at this important research direction,we start from the design and synthesis of functional materials and nanocomposites.La1-xSrxMnO3/ZnO composite nanoparticles were successfully synthesized via ball-milling which milled the mixture of La1-xSrxMnO3 and ZnO.Multifunctional high-performance[R(L)2(H2O)]H2[R(L)2(P2Mo5O23)]·4H2O/Fe3O4(R=Cu,Co,Cd,Zn)(L=pyridine-2-carboxamide)were successfully synthesized by combining[R(L)2(H2O)]H2[R(L)2(P2Mo5O23)]·4H2O and Fe3O4 nanoparticles.M-[CuL2(H2O)2]H2[P2Mo5O23]·2CH3OH-GR(M=Pd,Pt,Au,Ag)(L=pyridine-2-carboxamide)nanocomposites were successfully synthesized by ultraviolet-light radiation.The nature performances of nanocomposites were analysized by fourier transform infrared spectrometer(FT-IR),ultraviolet-visible light absorbance spectrometry(UV-Vis),photoluminescence spectrophotometry(PL),X-ray diffractometer(XRD),transmission electron microscopy(TEM,including high-resolution TEM),vibrating sample magnetometer(VSM)and superconducting quantum interference device(SOUID).The adsorption activity of the nanocomposites was investigated using methylene blue,gentian violet,safranine T,fuchsin basic,methyl orange and Sudan red(?)as probe molecules.The subject of the work is summarized as follows:1.Synthesis of La1-xSrxMnO3/ZnO composite nanoparticles which have optical property and magnetic propertyLa1-xSrxMnO3/ZnO composite nanoparticles were successfully synthesized via ball-milling which milled the mixture of La1-xSrxMnO3 and ZnO.The morphology of the La1-xSrxMnO3/ZnO composite nanoparticles was analyzed by transmission electron microscopy(TEM).The structure of the La1-xSrxMnO3/ZnO composite nanoparticles were confirmed by X-ray powder diffraction(XRD).The optical properties of the La1-xSrxMnO3/ZnO composite nanoparticles were investigated using an ultraviolet-visible spectrophotometer(UV-Vis)and a photoluminescence spectrophotometer(PL)..The magnetic properties of the La1-xSrxMnO3/ZnO composite nanoparticles were studied by a vibrating sample magnetometer(VSM)and a superconducting quantum interference device(SQUID).These magnetic-optical composite nanoparticles are promising for optical,magnetic and biomedical applications such as transportation of drugs,diagnosis of sickness,magnetic resonance imaging and fluorescent labels.2.Synthesis and adsorption properties of[R(L)2(H2O)]H2[R(L)2(P2Mo5O23)]·4H2O/Fe3O4(R=Cu,Co,Cd,Zn)Multifunctional high-performance[R(L)2(H2O)]H2[R(L)2(P2Mo5O23)]·4H2O/Fe3O4(R=Cu,Co,Cd,Zn)(L=pyridine-2-carboxamide)were successfully synthesized by combining[R(L)2(H2O)]H2[R(L)2(P2Mo5O23)]·4H2O(R=Cu,Co,Cd,Zn)and Fe3O4 nanoparticles.The characterization was performed by Fourier transform infrared spectroscopy(FT-IR),transmission electron microscopy(TEM),vibrating sample magnetometry(VSM),X-ray powder diffraction(XRD)and ultraviolet-visible light absorbance spectrometry(UV-vis).Take[Cu(L)2(H2O)]H2[Cu(L)2(P2Mo5O23)]·4H2O/Fe3O4 as an example,the XRD and TEM analyses reveal that the nanocomposites possess high crystallinity with an average particle size of-19.43 nm.The VSM and UV-vis measurements demonstrate excellent superparamagnetic behavior and two well-behaved absorption bands of the nanocomposites.The adsorption activity of the nanocomposites was investigated using methylene blue,gentian violet,safranine T,fuchsin basic,methyl orange and Sudan red(?)as probe molecules.The results reveal that the[Cu(L)2(H2O)]H2[Cu(L)2(P2Mo5O23)]·4H2O/Fe3O4 nanocomposites have selective adsorption behavior for organic dyes suggesting that the nanocomposites have a promising future for wastewater purifications.3.Synthesis and properties studies of precious metal-polyoxometalate-grapheneM-[CuL2(H2O)2]H2[P2Mo5O23]·2CH3OH-GR(M=Pd,Pt,Au,Ag)nanocomposites were successfully synthesized by ultraviolet-light radiation.Take Pd-[CuL2(H2O)2]H2[P2Mo5O23]·2CH3OH-GR as an example,the morphology and structural analyses reveal the narrow particle size distribution with an average diameter-7.12 nm and high crystallinity of the nanocomposite.The FTIR and UV-vis assessment confirm graphene,Pd nanoparticles and[CuL2(H2O)2]H2[P2Mo5O23]·2CH3OH are existed in Pd-[CuL2(H2O)2]H2[P2Mo5O23]·2CH3OH-GR nanocomposites.They have selective adsorption behavior for organic dyes,and they were found to be a good adsorbent and could be employed as an effective adsorbent applicable in adsorption field.