Antúnez-Flores W, Valenzuela-Muñiz A M, Amézaga-Madrid P, Alonso-Nuñez G, Verde Y, Martínez-Sánchez R, Miki-Yoshida M
Centro de Investigación en Materiales Avanzados, Miguel de Cervantes 120, Chihuahua, Chih., C.P. 31109, México.
J Nanosci Nanotechnol. 2008 Dec;8(12):6451-5.
Uniform multi-walled carbon nanotubes (MWCNTs) were obtained decomposing toluene inside of fused silica tubing previously covered with Co oxide thin film. The two-step process, ruled successively in the same aerosol assisted chemical vapor deposition (AACVD) set up, constitutes a simplified route to the synthesis of MWCNTs. First, Co oxide thin film was deposited inside of fused silica tubing at 723 K, using a precursor solution of Co acetate in absolute methanol. After Co oxide deposition, the covered tubing was heated up to 1173 K under Ar flow, then a mist of toluene was injected inside the tubing, using also Ar as carrier gas, consequently MWCNTs were obtained in the internal wall of the tubing. The Co oxide film and the MWCNTs were analyzed by scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and atomic force microscopy (AFM). Uniform and very long MWCNTs (several tens of microm) with diameters around 20 to 100 nm were observed, with the advantage that the content of Co particles inside the nanotube was very low.
通过在预先覆盖有氧化钴薄膜的熔融石英管内分解甲苯来制备均匀的多壁碳纳米管（MWCNTs）。在同一气溶胶辅助化学气相沉积（AACVD）装置中依次进行的两步过程，构成了一种合成MWCNTs的简化途径。首先，使用醋酸钴在无水甲醇中的前体溶液，在723 K下在熔融石英管内沉积氧化钴薄膜。氧化钴沉积后，将覆盖的管子在氩气流下加热至1173 K，然后使用氩气作为载气将甲苯雾注入管内，从而在管的内壁获得MWCNTs。通过扫描电子显微镜（SEM）、高分辨率透射电子显微镜（HRTEM）和原子力显微镜（AFM）对氧化钴薄膜和MWCNTs进行了分析。观察到直径约为20至100 nm的均匀且非常长的MWCNTs（几十微米），优点是纳米管内钴颗粒的含量非常低。
