One-step synthesis of a graphene-carbon nanotube hybrid decorated by magnetic nanoparticles |
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| Authors: | Xiao Zhu Guoqing Ning Zhuangjun Fan Jinsen Gao Chunming Xu Weizhong Qian Fei Wei |
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| Affiliation: | 1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, Changping 102249, PR China;2. Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, Heilongjiang 150001, PR China;3. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, PR China |
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| Abstract: | Graphene-carbon nanotube (G-CNT) hybrids were synthesized by a one-step chemical vapor deposition process using a mixed catalyst of MgO and Fe/MgO. MgO layers acted as templates for the growth of graphene, and Fe particles on the MgO layers catalyzed the growth of single or double-walled CNTs. The G-CNT hybrids had porous structures with hierarchical pore distributions due to the composition of graphene with CNT network. Superparamagnetism with a saturation magnetization of 2.7 emu/g was found in the G-CNT hybrids due to the existence of Fe3C nanoparticles of size ～3 nm. The graphene to CNT ratio was conveniently changed by varying the MgO to Fe/MgO ratio, as characterized by Raman analysis and specific surface area measurements. Furthermore, a simplified synthesis of G-CNT hybrids was demonstrated by using MgO supported Fe or Ni catalysts with a low metal concentration. |
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