不同晶态纳米Fe_2O_3的盐控合成(英文)  

Synthesis of Ferric Oxide Nanoparticles with Controllable Crystal Phases by Salt-assisted Combustion Method

作　　者：宋军[1] 马振叶[1,2] 李成[1] 吴如军[2] 

机构地区：[1]南京工业大学材料化学工程国家重点实验室,南京210009 [2]南京师范大学化学与环境科学学院,南京210097

出　　处：《无机材料学报》2010年第7期780-784,共5页Journal of Inorganic Materials

基　　金：National Natural Science Foundation of China(50702025);Natural Science Foundation of Jiangsu province(BK2009473);Natural Science Foundation of the Jiangsu Higher Education Institutions of China(08KJB430009);Youth Foundation of Nanjing University of Technology(39071014);Foundetion of State Key Laboratory of Materials-Oriented Chemical Engineering(KL09-13)

摘　　要：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 Fe（NO3）3·9H2O,polyethylene glycol（PEG2000） and KCl as oxidant,fuel and salt,respectively.The products were 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 KCl/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 from 21.96 to 102.35 m2/g.A mechanism was proposed to illustrate the possible formation process of different crystal phase nanoparticles with different character.

关 键 词：纳米Fe2O3 盐助燃烧法 晶态 

分 类 号：TQ138[化学工程—无机化工]