Frabrication And Luminescence Properties Of Nano-ZnGa₂O₄

ZnGa₂O₄,is a kind of ternary spinel material,and also a new type of n-type wide band gap semiconductor material.Due to its excellent thermal stability and chemical stability and wide band gap?4.4⁴.7 eV?,the compound have received widespread attention in many fields,such as light-emitting diodes,photodetectors,photocatalysis,flat panel display,bio-optical imaging,and solar cells.In this thesis,nano-ZnGa₂O₄ with different morphologies and properties was synthesized by one-step hydrothermal method and two-step treatment method using Ga?NO₃?₃,Zn?CH₃COO?₂ or ZnO as raw materials,and then by scanning electron microscopy?SEM?,X-ray powder diffractometry?XRD?,fluorescence spectrophotometer,Fourier infrared spectrometer?IR?,X-ray energy spectrometer?EDS?and thermogravimetry-differential analysis?TG-DSC?have performed a series of characterizations of the morphology,purity,composition,structure and properties of the prepared samples.The specific research content and characterization analysis results are as follows:?1?The single-factor variables were used to systematically investigate the effects of various reaction parameters on the morphology,purity and properties of the products obtained by changing the type of alkali in the process of one-pot hydrothermal synthesis of ZnGa₂O₄by using Ga?NO₃?₃ and Zn?CH₃COO?₂ as raw materials.By optimizing the experimental conditions,pure nano-ZnGa₂O₄ with good fluorescence properties and emission wavelength at469 nm was obtained,ZnGa₂O₄ nanoparticles with different sizes and structures were synthesized;?2?In the research process of two-step treatment,firstly we prepared the precursor of nano-GaOOH·Zn²⁺by hydrothermal method with the template agent Na₂EDTA,and then the effects of the type of template agent,the amount of stencil Na₂EDTA,the amount of Zn?CH₃COO?₂ were systematically studied.The synthesis range of the precursor nano-GaOOH·Zn²⁺was determined;?3?Under the premise of precursor nano-GaOOH·Zn²⁺,the effects of the temperature regulation on the prepared products during the single-sintering of nano-GaOOH·Zn²⁺and sintering after doping with ZnO was studied by the temperature gradient heat treatment method,and the rod-shaped nano-ZnGa₂O₄ was controlled.