Solution Solid Solid Design And Preparation Of New Metal Sulfide Semiconductor Nanowires

ZnS is an important group ⅡB-ⅥA direct bandgap semiconductor material and has important application value in optoelectronic devices such as light-emitting diodes,lasers and ultraviolet light detectors.As we know,the optical properties of the material is closely related to the size of its band gap,so the effective modulation of the ZnS band gap is the key for modulating its optical property.The band gap of ZnS nanowires can be adjusted by changing its size,composition and structure,so the controllable preparation of ZnS-based one-dimensional nanostructures is the first step to adjust the band gap.Solution-solid-solid（SSS）growth has unparalleled advantages in the controllable preparation of metal sulfides one-dimensional nanostructures.In this growth method,Ag₂S or Cu_2-xS is often used as a catalyst,and other metal-organic precursors dissociate and dissolve on the surface of the catalyst,and other metal organic precursors dissociate and dissolve on the surface of the catalysts,and eventually one-dimensional nanostructure grow along the direction of low interfacial energy.The main contents of this paper are as follows,（1）A series of novel ZnS/MnS one-dimensional heterostructures,such as Ag₂S-ZnS/MnS,Ag₂S-MnS/ZnS,Ag₂S-ZnS/MnS/ZnS,Ag₂S-MnS/ZnS/MnS,were synthesized by multi-step SSS growth at 120℃using Ag₂S as catalyst and[（C₄H₉）₂NCS₂]₂Znand[（C₄H₉）₂NCS₂]₂Mnas the precursors of Mnand Zn,respectively.X-ray diffractometer（XRD）was used to characterize the phase composition of the product,transmission electron microscope（TEM）was used to characterize the morphology of the product,high resolution transmission electron microscope（HRTEM）was used to characterize the microstructure of the product,and ultraviolet-visible spectrophotometer（UV-Vis）was used（UV-Vis）characterize the optical band gap of the product,and fluorescence spectrometer was used to characterize the luminescent properties of the product.The research results show that a series of Ag₂S-ZnS/MnS,Ag₂S-MnS/ZnS,Ag₂S-ZnS/MnS/ZnS,Ag₂S-MnS/ZnS/MnS new one-dimensional heterogeneous nanostructures have been successfully synthesized,and the optical band gaps and luminescent properties of the products could be effectively modulated.（2）With Ag₂S nanoparticles as catalysts and[（C₄H₉）₂NCS₂]₂Zn_1-xNi_x,[（C₄H₉）₂NCS₂]₂Zn_1-xCo_x,[（C₄H₉）₂NCS₂]₂Zn_1-xCu_xas the precursors,a series of Ni,Co and Cu ion doped ZnS nanowires were successfully synthesized by SSS growth respectively.The results of UV-Vis and PL showed that the optical band gaps and luminescent properties of the products were also effectively modulated.