title: Direct hydrothermal synthesis of single-crystalline hematite nanorods assisted by 1,2-propanediamine.
abstract: Uniform alpha-Fe2O3 nanorods with high aspect ratios were synthesized in large scale by a simple and direct 1,2-propanediamine-assisted hydrothermal method. The resultant products were characterized by x-ray diffraction scanning electron microscopy, and transmission electron microscopy. The as-synthesized alpha- Fe2O3 nanorods were single crystalline and uniform, with an average aspect ratio greater than 10. The effects of various experimental parameters on the morphology of products, such as 1,2-propanediamine content, pH value, concentration of FeCl3 and reaction temperature, were studied. In the formation process of alpha- Fe2O3 nanorods, the 1,2-propanediamine not only provides OH(-) but also plays a role for retaining the rod-like morphology of hematite. The magnetic properties including Morin transition and coercivity of the samples with different synthesis conditions and aspect ratios were also investigated in detail.
authors.affiliation: State Key Laboratory of Multi-Phase Complex System, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Zhenmin
authors.initials: Z
authors.lastname: Li
authors.forename: Xiaoyong
authors.initials: X
authors.lastname: Lai
authors.forename: Hong
authors.initials: H
authors.lastname: Wang
authors.forename: Dan
authors.initials: D
authors.lastname: Mao
authors.forename: Chaojian
authors.initials: C
authors.lastname: Xing
authors.forename: Dan
authors.initials: D
authors.lastname: Wang
mesh_terms: D000588:Amines / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D005290:Ferric Compounds / Q000737:chemistry*; D006358:Hot Temperature; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
chemical_list: D000588:Amines; D005290:Ferric Compounds; D046911:Macromolecular Substances; D014867:Water; C000499:ferric oxide