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Growth of Single-Walled Carbon Nanotubes with Controlled Structure

Zhang, Jin (Peking University, Beijing, CHN)

Direct growth single-walled carbon nanotubes (SWNTs) with controlled structures still remains many challenges. Even through many methods, aiming to optimize the interface of SWNT-catalyst or SWNT-seed for chirality-selective growth, were developed. However, the greatest difficulty impeding their moving forward to application is how to grow SWNTs with controlled structures. In this talk, we will focus on the controlled growth of SWNTs arrays with ultra-high density, high ratio semiconducting properties and special chiral angles. For the SWNTs arrays with ultra-high density, Trojan catalysts (released from substrate) was developed and the density can be as high as 150 tubes/μm. Combining Trojan catalysts with Mo nanoparticles as cooperating catalysts, the ultra-high density SWNTs arrays with wafer-scale area can be obtained. For the SWNTs arrays with semiconducting properties, oxides catalysts with oxygen vacancy, bimetal catalysts and uniform Mo2C catalyst were used to grow semiconducting SWNTs arrays and ratio of semiconducting tubes can be higher than 95%. For the SWNTs arrays with special chiral angles, based on the analysis the thermodynamics and kinetics of SWNTs growth, horizontally (2m, m) SWNT arrays with chiral angle of 19.1°, tubes arrays with small chiral angles(less than 10°) and near-armchair tubes ((n, n-1) or (n, n-2)) can be grown under different conditions.

[1] Growth of High-Density Horizontally Aligned SWNT Arrays using Trojan Catalysts, Nat. Commun. 6 (2015), 6099.

[2] Helicity-dependent single-walled carbon nanotube alignment on graphite for helical angle and handedness recognition, Nat. Commun. 4 (2013), 2205.

[3] Diameter-Specific Growth of Semiconducting SWNT Arrays Using Uniform Mo2C Solid Catalyst, J. Am. Chem. Soc. 137(28) (2015), 8904-8907.

[4] Selective Scission of C–O and C–C Bonds in Ethanol using Bimetal Catalysts for the Preferential Growth of Semiconducting SWNT Arrays, J. Am. Chem. Soc . 137 (3) (2015), 1012-1015. 

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