Abstract

In this study, a growth mechanism of vertically aligned carbon nanotubes (VACNT) on a nanostructured porous silicon template (NPSiT) was proposed based on the experimental observations obtained. Camphor oil and ferrocene (Fe) were used as a carbon source and a catalyst, respectively. The NPSiT was optimised and used as a template to synthesise VACNT. The VACNT was synthesised on NPSiT by using a double thermal chemical vapour deposition (DTCVD) method. The synthesis was also performed via a floated method in a DTCVD reactor by using an in-situ catalyst in the absence of any catalysts pre-treatment. Each of the growth mechanisms was proposed based on the TEM images obtained at different synthesis conditions. From the results, a mixed top and bottom growth model was proposed for the growth mechanism of VACNT at the pores and pillars. On the contrary, the tip growth model was proposed for the growth inside the pores, while the valley growth model was proposed for the growth within the pillars of NPSiT. Furthermore, a mixed tip and valley growth model was proposed based on the location of Fe particles.

摘要

在这项研究中，基于获得的实验观察，提出了垂直排列的碳纳米管（VACNT）在纳米结构多孔硅模板（NPSiT）上的生长机制。樟脑油和二茂铁 (Fe) 分别用作碳源和催化剂。NPSiT 被优化并用作合成 VACNT 的模板。通过使用双热化学气相沉积 (DTCVD) 方法在 NPSiT 上合成 VACNT。该合成还通过在 DTCVD 反应器中使用原位催化剂在没有任何催化剂预处理的情况下通过浮动方法进行。基于在不同合成条件下获得的 TEM 图像提出了每种生长机制。根据结果​​，提出了一种混合顶部和底部生长模型，用于 VACNT 在孔和柱处的生长机制。相反，NPSiT柱内生长提出了尖端生长模型，而NPSiT柱内生长提出了谷生长模型。此外，基于Fe颗粒的位置，提出了混合尖端和谷底生长模型。