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采用高温高压(HPHT)方法,以水热法制备的聚乙烯醇包覆FeOOH纳米棒为前驱体,合成了碳包覆γ-Fe2O3纳米棒.通过使用多种表征方法,研究了HPHT过程中合成温度对样品结构和形貌的影响,并对样品的生长机理进行了探讨.利用振动样品磁强计测量了样品的室温磁学性质.实验结果表明,反应温度为400?C,压强为1 GPa条件下制备的碳包覆γ-Fe2O3纳米棒具有较高的长径比(直径约为20 nm,长度约为150 nm),矫顽力可达到330 Oe(1 Oe=79.5775 A/m).该方法为制备具有核壳结构的一维纳米材料提供了新思路.
High-temperature high-pressure (HPHT) method was used to synthesize carbon-coated γ-Fe2O3 nanorods by using polyvinyl alcohol-coated FeOOH nanorods prepared by hydrothermal method as precursors.A variety of characterization methods were used to study the synthesis of HPHT Temperature on the structure and morphology of the sample, and the growth mechanism of the sample was discussed.Using vibrating sample magnetometer to measure the magnetic properties of the sample at room temperature.The experimental results show that the reaction temperature is 400? C, the pressure of 1 GPa The prepared carbon-coated γ-Fe2O3 nanorods have a high aspect ratio (about 20 nm in diameter and about 150 nm in length) and a coercivity of 330 Oe (1 Oe = 79.5775 A / m). The method provides a new idea for preparing a one-dimensional nano-material with a core-shell structure.