Synthesis of polyhedral iron oxide nanocrystals bound by high-index facets  

作　　者：GAO Feng LIU RongMei YIN JingZhou LU QingYi 

机构地区：[1]Department of Materials Science and Engineering, Nanjing University [2]State Key Laboratory of Coordination Chemistry [3]Nanjing National Laboratory of Microstructures [4]Coordination Chemistry Institute, Nanjing University [5]College of Biological and Chemical Engineering, Anhui Polytechnic University [6]School of Chemistry and Chemical Engineering, Huaiyin Normal University

出　　处：《Science China Chemistry》2014年第1期114-121,共8页中国科学（化学英文版）

基　　金：supported by the National Basic Research Program of China(2011CB935800);the National Natural Science Foundation of China(21071076,21021062 and 51172106)

摘　　要：High surface energy of high-index facets endows nanocrystals with high activities and thus promotes potential applications such as highly efficient catalysts,special optical,electrical and magnetic devices.But the high surface energy of the high-index facets usually drives them to grow faster than the other facets and finally disappear during the crystal growth,which leads the synthesis of nanocrystals with high-indexed facets exposed to be a great challenge.Herein,we introduced two routes to control the synthesis of-Fe2O3polyhedrons with different sets of high-index facets,one using different metal ions(Ni2+,Cu2+or Zn2+)as structure-directing agents and the other applying polymer surfactant sodium carboxymethyl cellulose(CMC)as additive.The growth process of high-index-Fe2O3polyhedrons was also discussed and possible growth mechanism was proposed.High surface energy of high-index facets endows nanocrystals with high activities and thus promotes potential applications such as highly efficient catalysts,special optical,electrical and magnetic devices.But the high surface energy of the high-index facets usually drives them to grow faster than the other facets and finally disappear during the crystal growth,which leads the synthesis of nanocrystals with high-indexed facets exposed to be a great challenge.Herein,we introduced two routes to control the synthesis of-Fe2O3polyhedrons with different sets of high-index facets,one using different metal ions（Ni2＋,Cu2＋or Zn2＋）as structure-directing agents and the other applying polymer surfactant sodium carboxymethyl cellulose（CMC）as additive.The growth process of high-index-Fe2O3polyhedrons was also discussed and possible growth mechanism was proposed.

关 键 词：a-Fe2O3 controlled synthesis polyhedrons high-index FACET 

分 类 号：O614.811[理学—无机化学] TB383.1[理学—化学]