【摘要】 以碳纳米管与液态Fe(CO)5的混合物为催化剂前躯体,加热分解制备出不同Fe/C比的碳纳米管负载铁氧体粒子,并以此为催化剂,采用甲烷催化裂解制备出Fe@C/CNT纳米复合粉体。利用XRD,FESEM和TEM对复合粉体的物相和形貌进行分析,结果表明:纳米复合粉体主要是由碳包覆Fe粒子(Fe@C)和碳纳米管组成,其中Fe@C的直径在10~250nm之间,包覆层的厚度约5~10nm,并能较好地分散在碳纳米管上。在2~18GHz范围内的电磁参数测试结果表明:制备的复合粉体中Fe/C的比例对材料的电磁参数影响较大。更多还原

【Abstract】 Using the mixture of carbon nanotubes and iron pentacarbonyl as precursor,the different Fe and C molar ratio of carbon nanotubes supported iron oxide particles were prepared by a pyrolysis reaction as catalysts.The nano-composite powders of Fe@C/CNT were synthesized by the catalytic decomposition of methane over this catalyst.The microstucture and electromagnetic of Fe@C/CNT were characterised by XRD,FESEM,TEM and S parameter vector network analyzer.The results shows that the nano-composite powders mainly consist of 50~250nm carbon encapsulated Fe particles(Fe@C) with carbon walls thickness in 5~10nm and carbon nanotubes(CNT),and their 2~18GHz complex permittivity(ε_r) and complex permeability(μ_r) change with the ratio of Fe and C.更多还原