Diameter-Specific Growth of Semiconducting SWNT Arrays Using Uniform Mo2C Solid Catalyst

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• 作者：Shuchen Zhang ; Lianming Tong ; Yue Hu ; Lixing Kang ; Jin Zhang
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：July 22, 2015
• 年：2015
• 卷：137
• 期：28
• 页码：8904-8907
• 全文大小：313K
• ISSN：1520-5126

文摘

Semiconducting single-walled nanotube (s-SWNT) arrays with specific diameters are urgently demanded in the applications in nanoelectronic devices. Herein, we reported that by using uniform Mo₂C solid catalyst, aligned s-SWNT (鈭?0%) arrays with narrow-diameter distribution (鈭?5% between 1.0 and 1.3 nm) on quartz substrate can be obtained. Mo₂C nanoparticles with monodisperse sizes were prepared by using molybdenum oxide-based giant clusters, (NH₄)₄₂[Mo₁₃₂O₃₇₂(H₃CCOO)₃₀(H₂O)₇₂]路10H₃CCOONH₄路300H₂O(Mo₁₃₂), as the precursor that was carburized by a gas mixture of C₂H₅OH/H₂ during a temperature-programmed reduction. In this approach, the formation of volatile MoO₃ was inhibited due to the annealing and reduction at a low temperature. As a result, uniform Mo₂C nanoparticles are formed, and their narrow size-dispersion strictly determines the diameter distribution of SWNTs. During the growth process, Mo₂C selectively catalyzes the scission of C鈥揙 bonds of ethanol molecules, and the resultant absorbed oxygen (O_ads) preferentially etches metallic SWNTs (m-SWNTs), leading to the high-yield of s-SWNTs. Raman spectroscopic analysis showed that most of the s-SWNTs can be identified as (14, 4), (13, 6), or (10, 9) tubes. Our findings open up the possibility of the chirality-controlled growth of aligned-SWNTs using uniform carbide nanoparticles as solid catalysts for practical nanoelectronics applications.