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Yue Hu, Yabin Chen, Pan Li and Jin Zhang Sorting out Semiconducting Single-Walled Carbon Nanotube Arrays by Washing off Metallic Tubes Using SDS Aqueous Solution Small 9

Version of Record online: 18 MAR 2013 | DOI: 10.1002/smll.201202940

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Semiconducting single-walled carbon nanotube (s-SWNT) arrays are produced via a procedure analogous to a surfactant-assisted decontamination process. Aligned individual SWNT arrays grow on a quartz surface as a mixture of metallic SWNTs (m-SWNTs) and s-SWNTs. They are immersed in a sodium dodecyl sulfate (SDS) solution, and the SDS molecules selectively adsorb onto m-SWNTs. This SDS coating minimizes the interaction between m-SWNTs and the substrate, thus the m-SWNTs are easily washed off during ultrasonication while the s-SWNT arrays remain on the substrate. The percentage of s-SWNTs in the arrays can be higher than 90%.

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