以Fe(NO)3·9H2 O和KOH为原料, 在100℃下水热反应6h制备了α-FeOOH纳米棒, 并在不同温度下对其进行热处理, 得到具有一维纳米孔结构的α-Fe2O3单晶. 用XRD和TEM对α-FeOOH和热处理产物α-Fe2O3的物相、形貌进行表征, 并结合TGA和FT-IR研究了α-FeOOH的热处理过程. 结果表明, α-FeOOH在239～295℃温度区间发生脱水相变α-FeOOH→α-Fe2O3. 纳米α-Fe2O3很好地保持棒状, 但在其表面出现了孔洞, 随着温度的升高孔洞趋于愈合. 采用DTA考察了α-Fe2O3纳米棒对高氯酸铵(AP)的催化作用. 不同温度下热处理得到的α-Fe2O3均使AP的高温分解温度显著降低, 其中350℃热处理得到的α-Fe2O3纳米棒使AP高温分解温度最大降幅达71.4℃.
The α-FeOOH nanorods were prepared via hydrothermal reaction of Fe(NO3)3·9H2O and KOH at
100℃ for 6h. Then the α-FeOOH nanords were heat treated at different temperautres, and single crystalline and multiporous α-Fe2O3 nanorods were obtained. The phase and morphology of the samples were characterized by XRD and TEM. The heat treatment process was investigated by TGA and FT-IR. The results show that the phase transition of α-FeOOH→α-Fe2O3 occurrs between 239℃ and 259.1℃. The α-Fe2O3 still keeps in rod shape and lots of holes appear on the surface which disappear with the temperature increasing. The catalytic performance of α-Fe2O3 nanorods was studied by decomposition of ammonium perchlorate(AP) based on DTA. The higher-temperature of exothermic peak of AP shifts towards low temperature when α-Fe2O3 nanorods are introduced into the reaction, and the largest decrement reaches 71.4℃ for the α-Fe2O3 nanorods heat treated at 350℃.
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