以Fe(NO3)3·9H2O为氧化剂,聚乙二醇(PEG2000)为燃料,采用KCl盐助燃烧法制备了不同晶态的纳米Fe2O3粒子,并用HRTEM、XRD、LRS和BET对其形貌和结构进行了表征.结果表明,纳米Fe2O3的晶态(包括纯α-Fe2O3、纯γ-Fe2O3以及α-Fe2O3和γ-Fe2O3混晶可以通过调整KCl/NO3-的摩尔比来控制合成.将惰性盐KCl引入到燃烧反应中,可以制得粒径小、比表面大、均匀分散的γ-Fe2O3纳米粒子.另外,本实验也探索了惰性盐KCl的作用机理.
The salt-assisted combustion method was applied in synthesis of Fe2O3 nanoparticles by using characterized by HRTEM,XRD,LRS and N2 adsorption.It is found that the crystal phase(including α-Fe2O3,γ-Fe2O3 and the mixed phases of α-Fe2O3 and γ-Fe2O3)of Fe2O3 nanoparticles can be adjusted by changing the KCI/NO3-molar ratio.Addition of soluble inert KCl in the redox mixture solution for combustion synthesis results in the formation of well-dispersed γ-Fe2O3 nanoparticles and a drastic increase in the specific surface area from21.96 to 102.35 m2/g.A mechanism was proposed to illustrate the possible formation process of different crystal phase nanoparticles with different character.
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