Preparation And Characterization Of Inorganic Nanoparticles Modified With Room Temperature Ionic Liquids

Several kinds of room temperature ionic liquid were prepared.Then the optimized conditions for preparing several types of inorganic nanoparticles and surface-capped inorganic nanoparticles in the room temperature ionic liquid as the reducing agent and stabilizer as well were studied.The effects of various factors on the morphology and microstructure of the inorganic nanoparticles were investigated.The electrocatalytic effect of Ni nanoparticles prepared after reaction at 180℃for 6 h in the presence of ionic liquid for oxidation of calcium hydroxyl-benzene sulfonate(CDBS) was evaluated.The main contents of the thesis include the following three facets.1.Preparation of hydroxyl-functionalized ionic liquid and Ni and Cu₂O nanoparticles in the presence of hydroxyl-functionalized ionic liquid as well as evaluation of electrocatalytic performance of Ni nanoparticles for oxidation of calcium hydroxyl-benzene sulfonateIonic liquid[C₂OHmim]BF₄(l-ethoxyl-3-methyl imidazolium tetrafluoroborate) was synthesized.The product was characterized by means of infrared spectrometry(IR) and nuclear magnetic resonance(¹H-NMR) spectrometry.A simple ionic liquid-assisted solvothermal synthesis route was established to prepare Ni nanoparticles from nickel acetyl acetonate[Ni(acac)₂]as the precursor,in the presence of N,N-dimethyl formamide(DMF) as the solvent and ionic liquid [C₂OHmim]BF₄ as the reducing agent and stabilizer as well.The as-prepared Ni nanoparticles were characterized by means of X-ray diffraction(XRD) and scanning electron microscopy(SEM).The electrocatalytic performance of the Ni nanoparticles prepared in the presence of ionic liquid for the oxidation of calcium hydroxyl-benzene sulfonate(CDBS) was evaluated.It was found that the size of the Ni nanoparticles could be tuned by properly adjusting the concentration of the ionic liquid [C₂OHmim]BF₄ and the reaction time and temperature as well.Moreover,the Ni\ nanoparticles prepared after reaction at 180℃for 6 h in the presence of the ionic liquid had strong electrocatalytic effect for oxidation of calcium hydroxyl-benzene sulfonate, making it potentially applicable in electrochemical biosensors.Moreover,an ionic liquid-assisted solvothermal route for preparing CU₂O nanoparticles was established using Cu(NO₃)₂ as the precursor and DMF as the solvent, where ionic liquid[C₂OHmim]BF₄ was used as the reducing agent and stabilizer as well.The effects of reaction conditions on the morphology and microstructure of Cu₂O products were investigated.The as-prepared Cu₂O nanoparticles were characterized by means of X-ray diffraction(XRD) and scanning electron microscopy(SEM).It was found that the size of the Cu₂O particles could be tuned by properly adjusting the concentration of the ionic liquid[C₂OHmim]BF₄ and the reaction time and temperature as well.2.Preparation of Fe₂O₃ nanoparticles Precursor of iron 11 -bromoundecylate was synthesized via the reaction of sodium 11 -bromoundecylate and Fe(NO₃)₃ in the presence of toluene as the solvent.Then Fe₂O₃ nanoparticles surface-modified with 11-bromoundecanoic acid was synthesized in autoclave at high temperature.The surface-modified Fe₂O₃ nanoparticles were allowed to react with methylimidazol generating ionic liquid modified Fe₂O₃ nanoparticles.The effects of reaction conditions on the morphology and microstructure of Fe₂O₃ nanoparticles were investigated.The as-prepared products were characterized by means of TEM and XPS.It was found that the size and dispersibility of the Fe₂O₃ nanoparticles could be tuned by properly adjusting the reaction time and temperature.3.Preparation of CuO nanostructures in ionic liquid CuO nanostructures were prepared via convenient milling-induced solid-state chemical reaction at room temperature of trihydrous copper nitrate and sodium hydroxide in the presence of ionic liquid as the solvent and stabilizer as well.The effects of reaction conditions on the morphology and microstructure of CuO nanostructures were investigated.The as-prepared products were characterized by means of TEM and XRD.It was found that the reaction temperature,the concentration ratio of the reactants,and the type of the ionic liquids played key roles in controlling the morphology of the products.And the size of the CuO nanoparticles could be tuned by properly adjusting the type of the ionic liquid and the reaction temperature as well.