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以酚醛树脂为原料、硝酸钴为催化剂前驱体,利用催化酚醛树脂合成碳纳米管。研究了温度、催化剂含量等对催化合成碳纳米管的影响。结果表明:硝酸钴首先分解为Co3O4,而后被原位还原为Co纳米颗粒,Co纳米颗粒再催化酚醛树脂裂解释放出的含碳气体生成碳纳米管;碳纳米管起始生长温度为673 K,最适宜生长温度为1 273 K;碳纳米管生长遵循顶端生长模式;催化剂的最佳加入量为酚醛树脂质量的0.75%;所制备碳纳米管直径约为20~100 nm,长度可达10μm。
Phenolic resin as raw material, cobalt nitrate as catalyst precursor, the use of catalytic phenolic resin synthesis of carbon nanotubes. The effects of temperature and catalyst content on the catalytic synthesis of carbon nanotubes were investigated. The results show that cobalt nitrate first decomposes to Co3O4 and then is reduced to Co nanoparticles in situ. Co nanoparticles re-catalyze the release of carbon-containing gas from phenolic resin to form carbon nanotubes. The initial growth temperature of carbon nanotubes is 673 K, The most suitable growth temperature is 1 273 K. The growth of CNTs follows the top growth mode. The optimal addition amount of catalyst is 0.75% of the phenolic resin. The diameter of the prepared CNTs is about 20-100 nm and the length is up to 10 μm.