The Synthesis And Performance Research Of Nano Tungstate And Molybdenum Disulfide

Recently,theory research and practical product experiment exhibit 1D nano-material with especially excellent character.The demand for 1D nano-material in industry production,national defence,science technology and day-to-day life is increasing,which improves the human research interest.It's very important and practical meaningful for people to study a simple synthetical route,prepare new-style 1D nano-material and discuss new practical value.This paper is about the synthesis,growth mechanism and performance research of nano tungstate and molybdenum disulfide.The main researches are as follows:1.We synthesize CoWO₄ Nanorods with SDS assist by water hydrothermal technology and investigate luminescent properties of CdWO₄ nanorods.The diameter of CdWO₄ nanorods synthesized at 180℃is about 20nm,and its length about 100nm-200nm; The sample has very strong 453 nm PL peak by excitating with 300nm emission wavelength.We bring forward the reaction mechanism of water hydrothermal:at higher temperature,the growth of CdWO₄ nanorods is controlled by Ostwald ripening progress.2.The multiform appearance ZnWO₄ Nanorods were synthesized by adjusting pH and reaction time.The as-synthesized ZnWO₄ nanorods were characterized by various techniques of XRD,TEM,SEM,and EDS.Luminescent properties of the samples were measured in different reaction condition.The ZnWO₄ nanorods grown when pH=9 and reaction time 12 hours are with lower crystal and the most strong luminescent intension.3.Using main material of Na₂WO₄ and CdCl₂,We synthesize CdWO₄ Nanorods with water hydrothermal technology according adjusting pH and reaction time.The CdWO₄ nanorods were characterized by various techniques of XRD,TEM,SEM,and EDS.The CdWO₄ nanorods is belong to single crystal system,the nanorods length is about 100nm and the diameter is 10～30nm.we observe the influence to luminescent properties of CdWO₄ Nanorods in different reaction condition.The result reveals that the photoluminescence of CdWO₄ nanorods is related with nanorods crystal degree.4.By simple water hydrothermal technology,We synthesize ZnWO₄ Nanorods by adulterating Cd²⁺and study the influence to luminescent properties of sample by adulterating different amount of Cd²⁺:The photoluminescence spectrum of ZnWO₄ nanorods with different amount of Cd²⁺is between 400～500nm bule low energy luminescence belt,the most strong peak is at 465nm,shoulder peak at 495nm;With accretion of Cd²⁺adulteration,the inner disfigurement density of ZnWO₄ nano-crystal increases,this inner disfigurement is be likely to becoming capturing center of electron,and this will result in high electron cavity compound ratio which can bring the buildup of fluorescence emission intension.5.CNT@MoS₂ nanotubes were prepared by a hydrothermal method.The products were characterized by HRTEM,EDX and XRD.The results demonstrate that the MoS₂ layers coated on CNTs have a well-developed crystalline structure.The plane space of MoS₂(002)wrap layer on CNTs is 0.63nm,and plane space between wrap layer with CNTs is 0.44nm.We cann't observe distinct surface disfigurement on CNTs layer otherwise.6.MoS₃ precursors were fabricated by simple precipitation method.The MoS₂ Bucky Onions with nesting spherical layered closed-cage structure were obtained by MoS₃ precursors heated at high temperature in hydrogen at-mosphere and Polyethylene glycol(PEG)was used as dispersant.The layer structure is integrity and the space between layers is about 0.62nm which is close to the space of MoS₂,this reveals that MoS₂ bucky onion is Closed by curling 002 face.We bring forward the MoS₂ bucky onion growth model:at H₂ atmosphere,MoS₂ bucky onion grows from out to inside, the Van der Waals force between MoS₂ layers will lead to forming MoS₂ bucky onion;PEG as dispersant,it can be adsorbed to precursor surface and this will form comparatively separate circumstance,when calcine,steric hindrance will help the formation of bucky onion.The method consists of a simple apparatus and manipu-lates so it has the ability to produce large quantities of MoS₂ Bucky Onions,which is important to the study of application.