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Hydrothermal Synthesis and sensing properties of ferric oxide nanostructures

Author: ZhangFengHua
Tutor: YangHeQing
School: Shaanxi Normal University
Course: Physical and chemical
Keywords: Hydrothermal method Sensing performance The nanorods assembled sea urchins structure of hollow microspheres Nano - octahedron Nanosheets cobblestone particle self-assembly
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 151
Quote: 1
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Abstract


This thesis is simple hydrothermal method were prepared α-Fe 2 O 3 nanorods assembled sea urchin structure of hollow microspheres, nano-octahedron and nanosheets self-assembly pebble-shaped structure, to study their morphology and crystal structure and the reaction temperature, reaction time, and the amounts of reactants and other conditions on the morphology. On this basis, the possible growth mechanism and sensing characteristics of different morphologies prepared α-Fe 2 O 3 nanostructures discussed The relationship between the structure and performance, the results obtained for the α-Fe 2 O 3 nano-structure of the physical and chemical properties and applied research laid the foundation. (1) α-Fe 2 O 3 the nanorods assembled structure of the sea urchin hollow microspheres hydrothermal synthesis, growth mechanism and sensing characteristics: 0.05 mol / L 12h SO 4 2 - existence of Fe 3 solution 140 ℃ hydrothermal reaction by the self-assembly of α-FeOOH nanorods micro ball, the grounds of microspheres at 600 ℃ 2h transformed porous one-dimensional α-Fe 2 O 3 nanorods assembled sea urchin structure of hollow microspheres The inner and outer diameters are approximately 2 and 5 μm, the α-Fe 2 O 3 Nanorods diameter of about 150nm. Study SO 4 2 - role in the process of the sea urchin structural hollow microspheres formation proposed growth mechanism, and study the α-Fe 2 O 3 nanorods assembled the sea urchins structure of hollow microspheres sensing nature. (2) α-Fe 2 O 3 nano-octahedral polyhedron Controlled Synthesis and octahedral growth mechanism: KBH 4 the presence of the Fe (NO 3 ) 3 , NaOH and ethylene glycol (V C2H6O2 : V NaOH = 8:5) hydrothermal reaction at 180-235 ℃ for 12 hours, prepared α-Fe 2 O 3 nano the octahedral and nano polyhedron structure. Synthesis of nano-octahedron and controllable nano polyhedron by the change of the reaction temperature, the average size of approximately 235 and 220 nm, respectively. Also studied the formation process of the octahedron, the proposed possible growth mechanism. (3) α-Fe 2 O 3 nanosheets self-assembly cobblestone-shaped particles and controllable synthesis of hollow spherical particles and their growth mechanism: by FeCl 3 oxalic acid and NaOH at 120 ° C hydrothermal reaction 12h, prepared α-Fe 2 O 3 nanosheets self-assembly cobblestone structure, length of about 570nm. Improve the reaction temperature, the preparation of α-Fe 2 O , 3 hollow ball. By changing the reaction temperature to achieve a controllable synthesis of the pebble-shaped particles and the hollow spherical particles. Pebble-shaped particles and the formation of hollow spheres, the possible growth mechanism.

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