【摘要】 报道了以三硝基苯酚 (苦味酸 ,C6H3 N3 O7)、乙酸钴 [Co(Ac) 2 ]和菲 (C1 4 H1 0 )作为爆炸物 ,通过热引发方式使其在不锈钢耐高压容器中发生爆炸反应来制备多壁碳纳米管 .利用 TEM,HRTEM和 XRD等手段对碳纳米管和催化剂的形貌和结构进行表征 ,综合 TEM和 TG测试结果确定产物中碳纳米管的含量 .结果表明 ,随着反应条件的变化 ,可获得外径分布在 2 0～ 4 0 nm范围内 ,管长为数十微米的多壁碳纳米管 .金属钴催化剂在爆炸过程中原位生成 .苦味酸装填密度的增大有利于碳纳米管含量的提高 ,优化条件 (苦味酸的装填密度为 0 .2 g/ cm3 )后碳纳米管的含量可达 70 %左右 .更多还原

【Abstract】 Carbon nanotubes can be synthesized via the detonation of the mixture of picric acid, cobalt acetate and phenanthrene at an appropriate molar ratio in a sealed stainless steel pressure vessel. TEM result shows that the carbon nanotubes present an appearance of entangled morphologies with outer diameters of 20-40 nm. The average lengths of the nanotubes between the two entangled points range from several to 40 μm. HRTEM result reveals the multi-wall structure of the obtained nanotubes. The in situ formed cobalt catalysts validated by XRD and TEM are crucial to the carbon nanotubes formation during the detonation. The abundance of nanotubes depends critically on the loading density of picric acid, under the experiment conditions and a high loading density is preferable to the preparation of nanotubes-rich products. Under an optimal condition(0.2 g/cm 3 loading density), the purity of as-synthesized nanotubes can be up to 70%, as confirmed by the combination of investigations of TEM and TG.更多还原