首页» 研究成果» 发表文章» 2015
2015

 

Growth of Close Packed Semiconducting Single-walled Carbon Nanotube Arrays Using Qxygen-

Deficient Ti02  Nanoparticles as Catalysts

L X Kang, Y Hu, L L Liu, J X Wu, S C Zhang, Q C Zhao, F Ding, Q W Li, J Zhang*, ,  Nano Lett2015,

15(1) (2015), 403-409.

ABSTRACT:For the application of single-walled carbon nanotubes (SWNTs) in nanoelectronic devices, techniques to obtain horizontally aligned semiconducting SWNTs (s-SWNTs) with higher densities are still in their infancy. We reported herein a rational approach for the preferential growth of densely packed and well-aligned s-SWNTs arrays using oxygen-deficient TiO2 nanoparticles as catalysts. Using this approach, a suitable concentration of oxygen vacancies in TiO2 nanoparticles could form by optimizing the flow rate of hydrogen and carbon sources during the process of SWNT growth, and then horizontally aligned SWNTs with the density of ∼10 tubes/μm and the s-SWNT percentage above 95% were successfully obtained on ST-cut quartz substrates. Theoretical calculations indicated that TiO2 nanoparticles with a certain concentration of oxygen vacancies have a lower formation energy between s-SWNT than metallic SWNT (m-SWNT), thus realizing the preferential growth of s-SWNT arrays. Furthermore, this method can also be extended to other semiconductor oxide nanoparticles (i.e., ZnO, ZrO2 and Cr2O3) for the selective growth of s-SWNTs, showing clear potential to the future applications in nanoelectronics.

KEYWORDS: Semiconducting single-walled carbon nanotube arrays, titanium dioxide catalysts, oxygen vacancy, preferential growth

Copyright(c)版权所有 公司纳米化学研究中心 北京市海淀区成府路202号 澳门游戏网站大全(中国)有限公司A区4层 100871 010-62757157
最后更新日期:201828 网站统计: