Enhancing the crystalline degree of carbon nanotubes by acid treatment, air oxidization and heat treatment

Chensha Li, Baoyou Zhang, Xingjuan Chen, Xiaoqing Hu, and Ji Liang Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China Center for Analysis and Measurement, Harbin Institute of Technology, Harbin 150001, China Chemistry Engineering Department, Harbin engineering university, Harbin 150001, China; The State key Lab of New Ceramics and Fine Processing of Tsinghua University, Beijing, 100084, China

摘 要：<正>Three approaches of treating carbon nanotubes （CNTs） including acid treatment, air oxidization and heat treatment at high temperature were studied to enhance the crystalline degree of carbon nanotubes. High temperature heat-treatment elevates the crystalline degree of carbon nanotubes. Acid treatment removes parts of amorphous carbonaceous matter through its oxidization effect. Air oxidization disperses carbon nanotubes and amorphous carbonaceous matter. The treatment of combining acid treatment with heat-treatment further elevates the crystalline degree of carbon nanotubes comparing with acid treatment or heat-treatment. The combination of the three treatments creates the thorough effects of enhancing the crystalline degree of carbon nanotubes.

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