温热沉淀和热分解技术制备金属钴纳米纤维(英文)

Preparation of Cobalt Nanofibres by Means of Mild Thermal Precipitation and Thermal Decomposition Process

以CoSO3和（NH4）2C2O4·H2O为原料,通过65℃的温热沉淀反应和温热陈化过程,控制合成了水合草酸钴纳米棒。以水合草酸钴纳米棒为前驱体,在Ar气氛中于360℃下,通过热分解过程制备纳米金属钴纤维。实验样品采用AAS,OEA,FT-IR,TGA-DTG,XRD和SEM测试技术进行分析。测试结果表明：温和液相沉淀法制备的样品为水合草酸钴,其化学式可写为CoC2O4·3H2O。制备的草酸钴纳米棒直径为0.2~0.4μm,长度为1.0~5.0μm;热分解制备的金属钴纳米纤维的直径约0.2μm,长度为1.0~5.0μm。

Through a mild thermal precipitation and aging process, hydrated cobalt oxalate nanorods were synthesized using COSO3 and （NHn）2C2O4·H20 as raw materials at the reaction and aging temperature of 65℃. Afterwards, the metal cobalt nanofibres were prepared by decomposition of cobalt oxalate nanorods precursor in Ar gas atmosphere. The composition and morphology of prod- ucts were characterized by means of atomic absorption spectrometer （AAS）, organic elemental analyzer （OEA）, Fourier transform infrared spectroscopy （FT-IR）, thermogravimetry analysis and derivative thermogravimetry （TGA-DTG）, the X-ray diffraction （XRD）, and scanning electron microscope （SEM）. The results demonstrate that the product is hydrated cobalt oxalate, and the chemical formula COC204·3H20 is confirmed. The sizes of the cobalt oxalate nanorods as-prepared are about 0.2-0.4 μm in diameter, and 1.0-5.0μm in length; the metal nanofibres prepared via decomposition process of hydrated cobalt oxalate nanorods are about 0.2 μm in diameter, and 1.0-5.0 μm in length.