纳米CeO2的制备及形成机制研究
Study on the preparation of CeO2 nanoparticles and the formation mechanism
To achieve the controllable synthesis of CeO2 nanoparticles,hollow octahedral cerium oxide nanoparticles were successfully prepared via a one-step solvothermal method using an alcohol-water solvent system.The effects of cerium precursor concentration,reaction temperature and time,polyvinylpyrrolidone (PVP) dosage,and the volume ratio of absolute ethanol on the microscopic morphology and formation mechanism of CeO2 particles were systematically investigated.The results indicate that both cerium precursor concentration and reaction temperature have significant influences on the particle size of CeO2.At a low cerium precursor concentration of 0.03 mol/L,cubic fluorite-phase CeO2 particles with an average size of 108.9 nm were obtained.At a relatively low reaction temperature of 140℃,the average particle size was 61.46 nm.With increasing cerium precursor concentration and rising reaction temperature,the particle size of CeO2 exhibited a clear increasing trend.The reaction time was found to determine the extent of internal dissolution of the particles,and hollow CeO2 structures were successfully formed when the reaction time reached 24 h.Within an appropriate range,the addition of PVP and the volume ratio of absolute ethanol synergistically provided steric hindrance during particle formation,effectively preventing aggregation.Meanwhile,they facilitated the self-assembly of precursor crystallites,leading to the evolution of CeO2 particles from near-spherical to octahedral morphologies.This study provides a simple and effective approach for the preparation of octahedral and hollow cerium oxide nanoparticles with tunable sizes.
cerium oxide nanoparticles / solvothermal method / morphological control / formation mechanism
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广西科技计划项目(桂科AD23023013)
桂林市科学研究与技术开发计划项目(20220120-1)
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