一维Cu@C核壳结构纳米复合材料的制备与表征

Synthesis and Characterization of One-dimensional Cu@C Core-shell Nanocomposites

以氯化铜作为铜源，六次甲基四胺（HMT）作还原剂和碳源，十六烷基三甲基溴化铵（CTAB）作表面活性剂，在水热条件下合成了一维Cu@C核壳结构纳米复合材料，并进行了表征分析。结果表明，制备的Cu@C核壳结构纳米复合材料为立方相铜晶体，无杂质出现。长度在几微米到十几微米，直径大约200-400nm。产物由铜、碳2种元素构成；从透射电镜照片可以清楚的看出明暗对比，表明产物的核壳结构。在反应过程中，十六烷基三甲基溴化铵（CTAB）起到了形状控制剂的作用。

One-dimensional Cu@C core-shell nanocomposites with copper as core and carbon as shell were synthesized by a simple, large-scale hydrothermal method using CuCl2 as copper source, hexamethylenetetramine （HMT） as reducing agent, C souce, and cetyltrimethylammonium bromide （CTAB） as surfactant. The obtained Cu @ C nanocomposites were characterized by X-ray diffraction （XRD）, field-emission scanning electron microscopy （FE-SEM）, transmission electron microscopy （TEM） and UV-VIS spectrum analysis. XRD shows that the obtained product is cubic phase of Cu crystal. EDS shows that the Cu@C core-shell nanocomposites are composed of copper and car- bon elements. SEM image shows that the product obtained have a length as long as doz- ens of microns and diameters of 200--400 nanometers. Dark/light contrast can be clearly observed along the radial direction by TEM image. In this process, CTAB plays an important role in the formation of these core-shell nanocomposites as a structure-directing agent.