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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-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 ℃，压强为1 GPa条件下制备的碳包覆-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.
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关键词:
- 碳包覆-Fe2O3 纳米棒 /
- 高温高压 /
- 磁性 /
- 矫顽力
-Fe2O3@C core-shell nanorods with average diameter of 20 nm and length of 150 nm are synthesized by transforming FeOOH@PVA nanorods under the condition of high pressure and high temperature (HPHT). The FeOOH@PVA nanorods are prepared via a hydrothermal route. The best synthesis condition for transforming FeOOH@PVA core-shell nanorods into -Fe2O3@C nanorods is 400 ℃ under 1 GPa. Owing to high aspect ratios, the -Fe2O3@C nanorods present a high coercivity of 330 Oe (10 Oe=79.5775 A/m). The possible mechanism for the synthesis of -Fe2O3@C nanorods is also discussed. The HTHP method can provide a new way for preparing of one-dimensional core-shell nanostructures.-
Keywords:
- -Fe2O3@C nanorods /
- high pressure and high temperature /
- magnetism /
- coercivity
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中国物理学会期刊
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