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MM1.08 - Chirality-Dependent Single-Walled Carbon Nanotube Alignment on Graphite for Helical Angle and Handedness Recognition 
Date/Time:
April 22, 2014   11:30am - 11:45am
 
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Aligned single-walled carbon nanotube (SWNT) arrays provide a great potential for the carbon-based nanodevices and circuit integration. Aligning SWNTs with selected chirality and identifying their helical structures remains a daunting issue. The widely used gas-directed and surface-directed growth modes generally suffer the drawbacks of mixed and unknown helicities of the aligned SWNTs. Here we develop a rational approach to anchor the SWNTs on graphite surfaces, on which the orientation of each SWNT sensitively depends on its helical angle and handedness. This approach can be exploited to conveniently measure both the helical angle and handedness of the SWNT simultaneously at a low cost. We believe that this approach has a great prospect for the future carbon-based nanoelectronics. Additionally, by combining with the resonant Raman spectroscopy, the (n,m) index of anchored SWNT can be further determined. Handedness and θ were quickly measured based on the chirality-dependent alignment of SWNTs on graphite surface. By combining their measured d and Eii, (n,m) indices of SWNTs can be independently and uniquely identified from the (θ,d) or (θ,Eii) plots, respectively. This approach offers intense practical merits of high-efficiency, low-cost, and simplicity.
 


 
 
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