化学气相沉积法制备CNOs及其磁选纯化研究

Synthesis and Magnetic Purification Research of CNOs by Chemical Vapor Deposition Method

以金属镍铁为催化剂,通过化学气相沉积法高选择性地制备了纳米洋葱碳(CNOs)。所制备的CNOs为内嵌金属核心与中空CNOs的混合物,常规的酸洗-煅烧纯化工艺往往会造成外层碳壳的破坏,形成无定型碳。通过对CNOs的铁磁性分析,提出了磁选分离工艺,可以有效地将内嵌金属的CNOs与空心CNOs分离,分离后空心CNOs纯度在95%以上。

Carbon nano onions（CNOs） were high selectively synthesized through chemical vapor deposition method using Ni-Fe metal as catalysts. As harvested CNOs contains metal core inside and hollowed CNOs. Amorphous is formed with the broken of carbon shells through the normal acid wash-burning technology. The magnetic properties of CNOs were analysised and magnetic separating technology was proposed. The results show that CNOs with metal core inside can be separated from the hollowed CNOs efficiently using this method and the purification rate reaches up to 95%.