Metallic iron nanoparticles:Flame synthesis,characterization and magnetic properties  

作　　者：Yunfeng Li Yanjie Hu Guangjian Huang Chunzhong Li 

机构地区：[1]Key Laboratory for Ultrafine Materials of Ministry of Education,School of Materials Science and Engineering,East China University of Science & Technology [2]Department of Surgery,Huashan Hospital,Fudan University

出　　处：《Particuology》2013年第4期460-467,共8页颗粒学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(21106038,51173043,21136006, 81071994);the Special Projects for Nanotechnology of Shanghai (11nm0500800,11nm0500200);the Basic Research Program of Shanghai(11JC1403000);the Special Research Fund for the Doctoral Program of Higher Education of China(20110074110010);the Shanghai Shuguang Scholars Program(10SG31);the Fundamental Research Funds for the Central Universities

摘　　要：Metallic iron （Fe） nanoparticles （NPs） with a typical core-sheU structure have been prepared by a simple and continuous flame spray pyrolysis （FSP） method, which are stabilized by the corresponding Fe304 shell with a thickness of 4-6 nm. The size of metallic Fe cores is about 30-80 nm. The core-shell structured iron NPs show an air stability as long as one month as a result of the protection of oxide shell. Through the control of the residence time of materials in flame and flame atmosphere, metallic Fe and iron oxides are obtained, showing a better external magnetic field responsibility. It is concluded that the evolution of morphology and composition of flame-made magnetic NPs could be attributed to the competition mechanism between reduction and oxidation reactions of in situ flame combustion, which offers more choices and better effective design strategy for the synthesis of advanced functional materials via FSP techniques.Metallic iron （Fe） nanoparticles （NPs） with a typical core-sheU structure have been prepared by a simple and continuous flame spray pyrolysis （FSP） method, which are stabilized by the corresponding Fe304 shell with a thickness of 4-6 nm. The size of metallic Fe cores is about 30-80 nm. The core-shell structured iron NPs show an air stability as long as one month as a result of the protection of oxide shell. Through the control of the residence time of materials in flame and flame atmosphere, metallic Fe and iron oxides are obtained, showing a better external magnetic field responsibility. It is concluded that the evolution of morphology and composition of flame-made magnetic NPs could be attributed to the competition mechanism between reduction and oxidation reactions of in situ flame combustion, which offers more choices and better effective design strategy for the synthesis of advanced functional materials via FSP techniques.

关 键 词：Iron NPsFSPReducing flameMagnetic properties 

分 类 号：O614.811[理学—无机化学]