Large-area growth of ultra-high-density single-walled carbon nanotube arrays on sapphire surface
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A scalable approach to obtaining high-density, large-area single-walled carbon nanotube (SWNT) arrays is essential for realizing the full potential of SWNTs in practical electronic devices; this is still a great challenge. Here, we report an improved synthetic method for large-area growth of ultra-high-density SWNT arrays on sapphire surfaces by combining Trojan catalysts (released from the substrate, to assure ultra-high density) with Mo nanoparticles (loaded on the surface, to stabilize the released Trojan catalysts) as cooperating catalysts. Dense and perfectly aligned SWNTs covered the entire substrate and the local density was as high as 160 tubes/μm. Field-effect transistors (FETs) built on such arrays gave an output current density of −488 μA/μm at the drain-source voltage (V ds) = the gate-source voltage (V gs) =–2 V, corresponding to an on-conductance per width of 244 μS/μm. These results confirm the wide range of potential applications of Trojan-Mo catalysts in the structure-controlled growth of SWNTs.
Keywordssingle-walled carbon nanotube arrays ultra-high density large area cooperating catalysts
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- Park, S.; Pitner, G.; Giri, G.; Koo, J. H.; Park, J.; Kim, K.; Wang, H. L.; Sinclair, R.; Wong, H. S. P.; Bao, Z. Largearea assembly of densely aligned single-walled carbon nanotubes using solution shearing and their application to field-effect transistors. Adv. Mater. 2015, 27, 2656–2662.CrossRefGoogle Scholar
- Feng, C. Q.; Yao, Y. G.; Zhang, J.; Liu, Z. F. Nanobarrierterminated growth of single-walled carbon nanotubes on quartz surfaces. Nano Res. 2009, 2, 768–773.Google Scholar
- Hu, Y.; Kang, L. X.; Zhao, Q. C.; Zhong, H.; Zhang, S. C.; Yang, L. W.; Wang, Z. Q.; Lin, J. J.; Li, Q. W.; Zhang, Z. Y. et al. Growth of high-density horizontally aligned SWNT arrays using Trojan catalysts. Nat. Commun. 2015, 6, 6099.Google Scholar
- Petit, P.; Salem, D.; He, M. S.; Paillet, M.; Parret, R.; Sauvajol, J.-L.; Zahab, A. Study of the thermal stability of supported catalytic nanoparticles for the growth of singlewalled carbon nanotubes with narrow diameter distribution by chemical vapor deposition of methane. J. Phys. Chem. C 2012, 116, 24123–24129.CrossRefGoogle Scholar
- Yang, F.; Wang, X.; Zhang, D. Q.; Yang, J.; Luo, D.; Xu, Z. W.; Wei, J. K.; Wang, J.-Q.; Xu, Z.; Peng, F. et al. Chiralityspecific growth of single-walled carbon nanotubes on solid alloy catalysts. Nature 2014, 510, 522–524.Google Scholar
- He, Y. J.; Li, D. Q.; Li, T. Y.; Lin, X. Y.; Zhang, J.; Wei, Y.; Liu, P.; Zhang, L. N.; Wang, J. P.; Li, Q. Q. et al. Metalfilm- assisted ultra-clean transfer of single-walled carbon nanotubes. Nano Res. 2014, 7, 981–989.Google Scholar