不同爆轰管温度下氢氧气相爆轰合成碳包铁纳米颗粒研究(英文)

Synthesis of Carbon-Encapsulated Iron Nanoparticles by Gaseous Detonation of Hydrogen and Oxygen at Different Temperatures within Detonation Tube

以二茂铁为前驱体,氢氧混合气体为爆源,在爆轰管内对碳包覆铁纳米颗粒进行合成。研究了初始反应温度及热处理对产物粒子的影响。通过XRD、TEM及VSM对爆轰产物进行了检验。结果表明,碳包覆纳米颗粒呈球形或椭球形。随着反应温度的升高,碳包覆纳米铁的晶粒尺寸为30~50 nm并且趋于均匀化,说明初始反应温度的高低直接影响生成颗粒的大小。通过不同温度热处理后爆轰产物的磁滞回线分析,饱和磁化强度（M s）随着热处理温度的升高而降低,磁滞回线为比较＂瘦＂的形状,但仍然具有较高的磁矫顽力,表明合成的碳包覆纳米材料呈现出硬磁性和顺磁性双重性质。

Using ferrocene as precursor, the mixed gas of hydrogen and oxygen as the source of explosion, the carbon encapsulated iron nanoparticles were prepared in a detonation tube. The influences of initial reactive temperature and heat treatment on the products of particles were studied. The characteristics of detonation products were tested by X-ray diffraction（XRD）, transmission electron microscope（TEM）, and vibrating sample magnetometer（VSM）. Results show that the carbon encapsulated nanoparticles exhibit the shapes of sphere or spheroid. With reaction temperature increasing, the grain sizes of carbon encapsulated iron nanoparticles are 30~50 nm and tend to be uniform, which indicates that the initial reaction temperature directly affects the grain sizes of the generated particles. Through the analysis of magnetic hysteresis loops of detonation products, the saturated magnetization（M s） decreases as the temperature of heat treatment increases, and the hysteresis loops are in a relatively ＂thin＂ shape, but still have higher coercivity, indicating that the synthesized carbon-encapsulated iron nanomaterials present the dual natures of the hard magnetic and the paramagnetic.