碳纳米管/羟基磷灰石复合材料的制备及表征

以含钴介孔分子筛为催化剂、乙醇为碳源, 采用CVD法制备碳纳米管(CNTs)。通过原位合成法制备一系列不同碳纳米管含量的碳纳米管/羟基磷灰石(CNTs/HA)复合材料。分别采用XRD、FTIR、TEM、N₂吸附-脱附和Raman光谱等分析手段, 对所合成CNTs/HA复合材料的晶相、结构、形貌和比表面积等进行了表征。同时研究了碳纳米管的添加量对所合成CNTs/HA复合材料形貌的影响。XRD与Raman结果表明, 所得CNTs/HA复合粉体中仅有CNTs与HA两种物相, 纯度较高, 结晶度较好; TEM结果显示, CNTs/HA复合材料中CNTs表面均匀包裹着一层纳米级的针状HA晶粒, 两者形成了较强的界面结合, 且当CNTs与HA的质量比为3:17时, CNTs与HA形成最佳结合状态; N₂吸附-脱附表征结果表明, 与HA的比表面积相比, CNTs/HA复合材料具有较高比表面积。

Preparation and characterization of carbon nanotubes/hydroxyapatite composites

Carbon nanotubes (CNTs) were prepared by chemical vapor deposition (CVD) method using Co-containing mesoporous molecular sieve as catalyst and ethanol as carbon source. A series of carbon nanotubes /hydroxyapatite (CNTs/HA) composites with different amounts of CNTs were synthesized by using an in-situ method. The structure, morphology, crystal phase and the surface area of the as-synthesized CNTs/HA composites were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, N 2 physical adsorption and Raman spectroscopy, respectively. At the same time, the effect of the addition of CNTs on the morphology of the CNTs/HA composite was also investigated. XRD and Raman results show that the obtained CNTs/HA composites exhibit two kinds crystal phases including CNTs and HA. Also, they have good quality and crystallinity. TEM results reveal that the surface of CNTs was uniformly wrapped-around with the nano-sized and needle-liked HA particles, and there is the good interfacial bonding between CNTs and HA. The optimal combination can be achieved between HA and CNTs when the mass ratio of CNTs to HA is about 3:17. N 2 adsorption–desorption results indicatethat of the CNTs/HA composites have high specific surface area as compared with the HA.