CVD法可控制备碳包覆金属纳米复合材料

以Fe质量分数分别为0.3%、1.6%、3.3%和5.2%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,w(Fe)=0.3%的催化剂制备的样品粒径在20～50 nm,平均直径约为30 nm;w(Fe)=1.6%的催化剂制备的样品粒径在35～60 nm,平均直径约为49 nm;而w(Fe)=3.3%和5.2%的催化剂制备的样品粒径差别不大,在40～100 nm,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。

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

To control the synthesis of carbon encapsulating metal nano-particles,the reations were carried out at 400 ℃,using iron supported on sodium chloride as catalyst,which contained about 0.3%,1.6%,3.3% and 5.2% 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 of 20~50 nm and the mean diameter of 30 nm were obtained using the catalyst containing 0.3% iron.When using the catalyst containing iron of 1.6%,the product with diameters in the range of 35~60 nm and the mean diameter of 49 nm was obtained.While using the catalyst containing iron of 3.3% and 5.2%,there was no obvious difference in diameter between the two products,and the product with diameters in the range of 40~100 nm and the mean diameter of 65 nm was obtained.