同位素示踪法在碳纳米管填充释放行为研究中的应用

Application of Isotope Tracer Technique on the Study of the Filling and Release Behavior of Carbon Nanotubes

摘要: 应用同位素示踪技术,以110Agm AgNO3溶液填充、NaNO3或HNO3溶液洗涤氧化开口后的碳纳米管(CNTs),研究了填充物110Agm AgNO3在水溶液中从碳纳米管中的释放情况;用高分辨透射电镜(HREM)、扫描电镜(SEM)、X射线衍射(XRD)、X射线能量色散谱(EDS)对CNTs的填充情况进行了表征;根据放射分析测量结果计算了CNTs腔内部样品的填充量。结果表明,CNTs腔内有银材料填充并且在水溶液中不会释放出来;示踪技术能有效地应用于CNTs的填充、释放等行为的研究及材料填充量的定量测定。

Abstract: The behaviors of washing and release of~(110)Ag~m-AgNO_3 from carbon nanotubes (CNTs), following soak of opened CNTs in~(110)Ag~m-AgNO_3 solutions are investigated with the isotope tracer technique. The filled CNTs samples are characterized by HREM, SEM, XRD and EDS. The amount of filled materials is also estimated by the isotope tracer technique. It shows that there are silver materials filled in the CNTs and would not release from the cavities. The results indicate that radioactive tracer is an effective and powerful technique to be applied into study of filling and release behaviors of CNTs as well as estimating the amount of filled materials.