Zhao Z W, Lei W, Zhang X B, Tay B K, Chen J S
School of Electronic Science and Engineering, Southeast University, Nanjing, 210096, China.
J Nanosci Nanotechnol. 2012 Aug;12(8):6583-7. doi: 10.1166/jnn.2012.5427.
Bamboo-shaped carbon nanotubes (CNTs) had been successfully fabricated by a plasma enhanced chemical vapor deposition method, in which nanocluster-assembled ZnO:Co thin film was used as catalyst. It was found that bamboo-shaped CNTs were generally grown in a direction perpendicularly to the substrate surface with the tops of CNTs dominated by the droplet-like catalyst covered by the carbon layer. The diameter of CNTs was ranged from 20-50 nm. High resolution of TEM image showed that the typical CNT had a multi-walled structure with an inner core presented. The ordered graphite layers were inclined to an axis of CNT about 18 degrees and the interlayer space of a CNT was about 0.35 nm. Two peaks in Raman spectrum at 1586 cm(-1) and 1372 cm(-1) were identified as G-band and D-band for graphite, respectively. The results showed that catalyst based on ZnO:Co thin films could be used for the growth of CNTs with bamboo-shaped structure.
通过等离子体增强化学气相沉积法成功制备了竹节状碳纳米管（CNTs），其中采用纳米团簇组装的ZnO:Co薄膜作为催化剂。研究发现，竹节状碳纳米管通常垂直于衬底表面生长，碳纳米管的顶部由被碳层覆盖的液滴状催化剂主导。碳纳米管的直径范围为20 - 50纳米。高分辨率透射电镜图像显示，典型的碳纳米管具有多壁结构且有内芯。有序的石墨层相对于碳纳米管的轴倾斜约18度，碳纳米管的层间距约为0.35纳米。拉曼光谱中1586 cm(-1)和1372 cm(-1)处的两个峰分别被确定为石墨的G带和D带。结果表明，基于ZnO:Co薄膜的催化剂可用于生长具有竹节状结构的碳纳米管。
