Growth of high quality, high density single-walled carbon nanotube forests on copper foils

详细信息    查看全文

• 作者：Guofang Zhong^a ; ^{gz222@cam.ac.uk" class="auth_mail" title="E-mail the corresponding author} ; ^{zhongchina@msn.com" class="auth_mail" title="E-mail the corresponding author} ; Junwei Yang^a ; Hisashi Sugime^a ; Rahul Rao^b ; ¹ ; Jianwei Zhao^c ; Dameng Liu^d ; Avetik Harutyunyan^b ; John Robertson^a
• 刊名：Carbon
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：98
• 期：Complete
• 页码：624-632
• 全文大小：3141 K

文摘

We demonstrate the growth of high quality single-walled carbon nanotube (SWCNT) forests on commercial Cu foils by cold-wall chemical vapor deposition. Time-of-flight secondary ion mass spectrometry was employed to study the effect of annealing on the catalyst evolution with or without an AlO_x barrier layer. X-ray photoelectron spectroscopy was used to investigate the chemical states of the catalyst and the barrier layer. SWCNT forests can be reproducibly grown on Cu foils sputter-coated with Al and Fe layers as thin as 6 nm and 0.4 nm, respectively. Al transforms into AlO_x on exposure to air and during annealing. Most importantly, such a thin AlO_x barrier layer ensures not only the growth of SWCNTs but also an Ohmic contact between the as grown SWCNTs and the Cu base as measured by a two-point probe station. The as-grown SWCNTs exhibit a bimodal distribution of diameters ranging from 0.6 to 4.5 nm, with two peaks centered at 0.8 nn and 2.6 nm, respectively.