Synthesis Of Metal Oxide Nanomaterials By Thermo-decomposition Of Organometallic Complex

The thermolysis of organometallic precursors in combined solvents is one of the most effective methods for preparing highly crystalline and size-controlled nanocrystals.The aim of this dissertation is to synthesize some cheap,air-stable and low-toxicity single precursor for preparation of size-controlled nanomaterials by thermal decomposition method.The as-prepared nanomaterials are characterized by XRD,TEM,HRTEM, SEM and their growth mechanism is also briefly investigated.The major contents can be summarized as follows;1.Preparation of size-controlled In₂O₃ nanoparticles by thermal decomposition of precursors.Highly crystalline and monodisperse In₂O₃ nanoparticles were firstly prepared by thermal decomposition of In(dipy)₂Cl₃·3H₂O in oleylamine and oleic acid under inert atmosphere. The size of In₂O₃ nanoparticles can be readily tuned from 10～15 nm to 40～50 nm,depending on the molar ratio of.precursor to combined solvents in the reaction system.The size-controlled mechanism and PL emission of the In₂O₃ nanoparticles is briefly explained.The center-body cubic nanoparticles were prepared by thermal decomposition of In(phen)₃Cl₃·H₂O in combined solvents.The size of In₂O₃ nanoparticles is 40-45 nm.If direct calcination of In(phen)₃Cl₃·H₂O, the mixed phase of In₂O₃ nanoparticles were prepared.The phase of product transformed from mixed phase to pure body-center phase when the precursor was heated from 300℃to 700℃.So the methods and temperature of decomposition precursor are key factors to determine the phase of products.In(cup)₃ is another precursor for prepare In₂O₃ nanoparticles.12 nm In₂O₃ nanoparticles were prepared by thermal decomposition of In(cup)₃ in complex solutions The size can be readily tuned 25 nm by change the molar ratio of precursor to combined solvent.We synthesized new precursor using(Me₃Si)₂NLi reacting with InCl₃. Thermal decomposition of the precursor,we got In₂O₃ by XRD character.2.Preparation of lanthanide oxychloride nanoplates.We synthesized precursors.Ln(dipy)₂Cl₃·2H₂O(Ln=Nd,Pr)and obtained PrOCl and NdOCl nanoplates by thermolysis them in oleic acid/oleyamine solvents. A possible formation mechanism was discussed.This is the first report of synthesis of lanthanide oxychloride nanoplates.We synthesized[(Me₃Si)₂N]₃Nd(μ-Cl)Li(THF)₃ complex and studied thermal-decomposition of this precursor in combined solvents.