CVD法可控制备碳包覆金属纳米复合材料

Controlled synthesis of carbon encapsulating metal cores nano-composites by chemical vapor deposition

摘要:

以Fe含量分别为0.3 wt%，1.6 wt%，3.3 wt%和5.2 wt%的氯化钠担载铁为催化剂，化学气相沉积法催化裂解乙炔400 ℃下进行反应，系统探讨了碳包覆金属纳米颗粒的可控制备。通过扫描电子显微镜和高分辨透射电子显微镜对产物进行了表征，结果表明：铁含量为0.3 wt%的催化剂制备的样品粒径在20-50 nm之间，平均直径约为30 nm；铁含量为1.6wt%的催化剂制备的样品的粒径在35-60 nm之间，平均直径约为49 nm；而铁含量为3.3 wt%和5.2 wt%的催化剂制备的样品粒径差别不大，在40-100 nm之间，平均粒径约为65 nm。所制备的碳包覆金属纳米颗粒具有清晰的同心石墨壳层结构，并存在一定的结构缺陷。

Abstract:

To control synthesis of carbon encapsulating metal nano-particles, the reations were carried out at 400 ℃ and using iron supported on sodium chloride as catalyst which contain about 0.3, 1.6, 3.3 and 5.2 wt% of iron. The samples were examined by scanning electron microscopy and high resolution transmission electron microscopy. The results show that carbon encapsulating Fe cores nano-particles with diameters in the range 20-50 nm and the mean diameter 30 nm were obtained using the catalyst containing 0.3wt% iron. When using the catalyst containing iron of 1.6 wt%, the product with diameters in the range 35-60 nm and the mean diameter 49 nm was obtained. While using the catalyst containing iron of 3.3 and 5.2wt%, there was no obvious difference in diameter of the two products, and the product with diameters in the range 40-100 nm and the mean diameter 65 nm was obtained.