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分别以高纯碳纳米管(MWCNTs)、未纯化MWCNTs和盐酸纯化MWCNTs为原料,铅(Pb)和石墨(Gr)为压力传递媒介,在4GPa和7.7GPa高压和室温条件下制备块体碳纳米管。其直径约为6nm,呈圆柱形块体。采用拉曼光谱仪、X-射线衍射仪、氮吸附仪和透射电镜表征样品。结果表明,含有MgO催化剂杂质的未纯化MWCNTs,以Pb为媒介时,在7.7GPa下可获得最佳压缩样品。高压可引起MWCNTs压缩和剪切应力。Pb容器作为准静压传递媒介可提供更多压缩应力,同时杂质能作为黏结剂,从而有利于得到致密化度较高的MWCNTs。
High-purity carbon nanotubes (MWCNTs), unpurified MWCNTs and hydrochloric acid-purified MWCNTs were used as raw materials, and lead and graphite (Gr) were used as pressure transfer media to prepare bulk carbon nanomaterials at pressures of 4 GPa and 7.7 GPa respectively tube. Its diameter is about 6nm, cylindrical block. The samples were characterized by Raman spectroscopy, X-ray diffraction, nitrogen adsorption and transmission electron microscopy. The results show that the optimal compressed samples can be obtained at 7.7GPa with Pb-mediated purification of unpurified MWCNTs containing MgO catalyst impurities. High pressure can cause MWCNTs to compress and shear stress. Pb containers provide more compressive stress as a quasi-hydrostatic transmission medium, while impurities act as binders, favoring higher densification MWCNTs.