The multi-walled nanotubes (MWNTs) have been synthesized in large scale by using metal formate as catalyst precursors. The calcium carbonate is used as catalyst support, it is chosen because of its non toxic and easily soluble nature. The synthesis was carried out by chemical vapor deposition method for 15 min under optimized conditions. The products were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and X-ray diffraction (XRD) method. The purity of the as grown products and purified products were determined by thermal analysis. The obtained yield of MWNTs was about 8300 wt% relative to the nickel catalyst. This synthesis route avoids the lengthy process of calcination and reduction for the preparation of catalysts hence this method is more economical. This economical and environmental friendly synthesis route can be used for synthesizing MWNTs in large scale.
使用
甲酸金属作为催化剂前体,大规模合成了多壁纳米管(MWNTs)。之所以选择
碳酸钙作为催化剂载体,是因为
碳酸钙无毒且易溶。合成采用
化学气相沉积法,在优化的条件下持续 15 分钟。通过扫描电子显微镜 (
SEM)、透射电子显微镜 (
TEM)、拉曼光谱和 X 射线衍射 (XRD) 方法对产品进行了表征。热分析测定了生长产物和纯化产物的纯度。相对于
镍催化剂,所获得的 MWNTs 产量约为 8300 wt%。该合成路线避免了制备催化剂时漫长的煅烧和还原过程,因此更加经济。这种经济环保的合成路线可用于大规模合成 MWNTs。