Investigation on the Formation Mechanism of Double-Layer Vertically Aligned Carbon Nanotube Arrays via Single-Step Chemical Vapour Deposition

Shoumo Zhang; Deli Peng; Huanhuan Xie; Quanshui Zheng; Yingying Zhang

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Investigation on the Formation Mechanism of Double-Layer Vertically Aligned Carbon Nanotube Arrays via Single-Step Chemical Vapour Deposition

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The mechanism for the formation of double-layer vertically aligned carbon nanotube arrays (VACNTs) through single-step CVD growth is investigated. The evolution of the structures and defect concentration of the VACNTs are tracked by scanning electron microscopy (SEM) and Raman spectroscopy. During the growth, the catalyst particles are stayed constantly on the substrate. The precipitation of the second CNT layer happens at around 30 min as proved by SEM. During the growth of the first layer, catalyst nanoparticles are deactivated with the accumulation of amorphous carbon coatings on their surfaces, which leads to the termination of the growth of the first layer CNTs. Then, the catalyst particles are reactivated by the hydrogen in the gas flow, leading to the precipitation of the second CNT layer. The growth of the second CNT layer lifts the amorphous carbon coatings on catalyst particles and substrates. The release of mechanical energy by CNTs provides big enough energy to lift up amorphous carbon flakes on catalyst particles and substrates which finally stay at the interfaces of the two layers simulated by finite element analysis. This study sheds light on the termination mechanism of CNTs during CVD process.

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《安徽地质》 |2017年第1期|135-141|共7页
作者
Shoumo Zhang; Deli Peng; Huanhuan Xie; Quanshui Zheng; Yingying Zhang;
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Center for Nano and Micro Mechanics, School of Aerospace Engineering, Tsinghua University, Beijing 100084, People’s Republic of China;

Center for Nano and Micro Mechanics, School of Aerospace Engineering, Tsinghua University, Beijing 100084, People’s Republic of China;

Center for Nano and Micro Mechanics, School of Aerospace Engineering, Tsinghua University, Beijing 100084, People’s Republic of China;

Center for Nano and Micro Mechanics, School of Aerospace Engineering, Tsinghua University, Beijing 100084, People’s Republic of China;

Center for Nano and Micro Mechanics, School of Aerospace Engineering, Tsinghua University, Beijing 100084, People’s Republic of China;

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1. Growth Mechanism of Vertically Aligned Carbon Nanotube Arrays [J] . Ji-cheng Zhang ,Yong-jian Tang ,Yong Yi . 化学物理学报 . 2015,第005期
2. Towards the low temperature growth of uniform diameter multi walled carbon nanotubes by catalytic chemical vapour deposition technique [J] . Thirunavukkarasu Somanathan ,Arumugam Pandurangan . 安徽地质 . 2010,第003期
3. Fabrication of carbon nanotubes through metal-free chemical vapor deposition [C] . . 第七届海峡两岸新型炭材料学术研讨会 . 2008
4. Photochemical Surface Functionalization of Single-walled Carbon Nanotubes and Diamond Powder [A] . Mirza Nadeem Ahmad . 2010

Investigation on the Formation Mechanism of Double-Layer Vertically Aligned Carbon Nanotube Arrays via Single-Step Chemical Vapour Deposition

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