Α-Fe ₂ 3 Cube-dependent Magnetic Properties And Its AgCl @ α-Fe ₂ O ₃

nanocubes were synthesized through a simple hydrothermal method, by selective adsorption of Cl ion. Morphologies and structures of these products were characterized by means of scanning electron microscopy, X-ray diffraction, and transmission electron microscopy. Controlled the size, and the number or size of subparticle inside by tuning the concentration of FeCl3 solution and the reaction time. The magnetic properties of the as-synthesized α-Fe2O3 nanocubes were investigated and revealed the main factors affecting the coercivity. By changing the structure of α-Fe2O3 nanocubes structure of the crystal face exposed, to study their photocatalytic properties, explore the relationship between the structure of the crystal surface and photocatalytic activity. The specific findings are as follows:(1) Controlled synthesis of α-Fe2O3 nanocubes:Uniform α-Fe2O3 nanocubes with exposed{102}、{012} and{112} faces were synthesized by the hydrothermal reaction of FeCl3 and NaOH at 140℃. Controlled synthesis of nanocubes with different sizes and crystalline were achieved by tuning the concentration of FeCl3 solution and the reaction time.(2) The study of the size-dependent magnetic properties of the α-Fe2O3 nanocubes: The magnetic properties of the as-synthesized α-Fe2O3 nanocubes were investigated. They all exhibited weak ferromagnetism. The relationship between magnetic properties with the size, the scherrer crystallite size and the number of subparticle inside were discussed, and it was found that there is no relationship between the coercive force and the crystalline, the scherrer crystallite size and the number of subparticle inside. Determinants of magnetic properties is the size of the sample. The coercive force was increased with the increasing sizes of nanocubes and caused a maximum in the coercive field, which then decreased with increase of particle size.(3) Preparation of AgCl@ α-Fe2O3nanocubes and study of the enhanced photo-catalytic properties:The products was surface modified by dispersing in different volume of AgNO3 solution and then treated with ammonia to get α-Fe2O3 nanocubes with clean high activity surfaces. The photocatalytic properties of them was studied and it was found that the surface modification can effectively improve the photocatalytic efficiency which increased with the enhancing load capacity of AgCl. Moreover, the α-Fe2O3 nanocubes with clean high activity surfaces had enhanced photocatalytic properties.