Modulating oxygen vacancy concentration for selective growth of semiconducting single-walled carbon nanotubes with narrow diameters  

作　　者：Lei Yang Tingkai Zhao Abdul Jalil Huijun Luo Tao Jiang Yuan Shu Yazhou Yin Weiyu Jia 

机构地区：[1]NPU-NCP Joint International Research Center on Advanced Nanomaterials&Defects Engineering,Shaanxi Engineering Laboratory for Graphene New Carbon Materials and Applications,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an 710072,China [2]Department of Physics,Allama Iqbal Open University Islamabad,Pakistan

出　　处：《Journal of Materials Science & Technology》2024年第7期44-54,共11页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foun-dation of China(Nos.51872231 and 51672221);the Key Indus-trial Chain Project of Shaanxi Province,China(No.2018ZDCXL-GY-08-07).

摘　　要：Semiconducting single-walled carbon nanotubes(s-SWCNTs)with narrow diameters are promising for future applications in many fields,especially in nanoelectronics and optoelectronics.In this study,the oxygen vacancy concentration modulating strategy was utilized for growing narrow diameters s-SWCNTs by the chemical vapor deposition(CVD)method.The Fe_(0.01)Mg_(0.99)O solid solution based catalyst was syn-thesized to anchor the Fe particles and inhibit aggregation for growing SWCNTs with uniform diameters.CeO_(2)was introduced into the catalyst to provide oxygen vacancies through H_(2)prereduction.These oxygen vacancies could form an oxidative environment during the growth of SWCNTs,and the chemically active metallic carbon nanotube caps are selectively etched away under this environment.The Fe/Ce molar ratio and H2 prereduction time were optimized to modulate the oxygen vacancy concentration.Ultimately,us-ing the Fe_(0.01)Mg_(0.99)O/CeO_(2)(3)catalyst with 10 min of H_(2)prereduction time,high purity s-SWCNTs with diameters ranging from 1.41 to 1.71 nm and a content of 95.1%were obtained with high selectivity and carbon yield(1.33 wt%).The mechanism behind this phenomenon was elucidated through experimental characterizations and first-principle simulations,further expanding the understanding of the growth of s-SWCNTs through the modulation of oxygen vacancy concentration.

关 键 词：Semiconducting single-walled carbon nanotubes Oxygen vacancy concentration Fe_(0.01)Mg_(0.99)O/CeO_(2)catalyst 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TQ127.11[化学工程—无机化工]