Abstract
We have demonstrated that the aqueous two-phase extraction (ATPE) can differentiate between large diameter single-walled carbon nanotubes (CNTs) by electrical character. Introduction of “hydration modulators” to the ATPE machinery has enabled us to isolate metallic and semiconducting CNTs with ease. We have also shown that often there is a trade-off between the purity of the obtained fractions and the ability to separate both metallic and semiconducting CNTs at the same time. To isolate the separated CNTs from the matrices, we have proposed a method based on precipitation and hydrolysis, which can eliminate the need to use lengthy dialysis routines. In the final step, we prepared thin free-standing films from the sorted material and probed how electrical charge is transported through such macroscopic ensembles.
Highlights
The term carbon nanotubes (CNTs) may be somewhat misleading by implying that it is a plurality of exact copies of individual CNTs
We present our results of sorting large diameter single-walled carbon nanotubes (SWCNTs) by using a single-step adaptation [15] of the aqueous two-phase extraction (ATPE) method [16]
We present our results of sorting large diameter SWCNTs by using a Nsainnogmlaete-rsitaelsp20a1d9,a9p, 6t1a4tion [15] of the aqueous two-phase extraction (ATPE) method [16]
Summary
The term carbon nanotubes (CNTs) may be somewhat misleading by implying that it is a plurality of exact copies of individual CNTs. Large diameter single-walled carbon nanotubes (SWCNTs) are attractive for various fields of science and technology, including photonics and microelectronics [9] Their ability to emit light in the telecom range [10,11], as well as maintain high saturation current [12] at a reduced Schottky barrier [13], make them a very promising material. A promising way to handle this problem was provided by He et al, who produced spontaneously aligned CNT films from a variety of parent materials [14] In this contribution, we present our results of sorting large diameter SWCNTs by using a single-step adaptation [15] of the aqueous two-phase extraction (ATPE) method [16]. With regard to the DEX phase, 0.7 M HNO3 was used to precipitate the CNTs and the mixture was filtered under reduced pressure using warm distilled water, acetone, and methanol as the washing media. The values were recorded at room temperature for neat and p-doped films (BF3 solution in methanol was dripped onto the film and the solvent was allowed to evaporate)
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