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Selective separation of single-walled carbon nanotubes in aqueous solution by assembling redox nanoclusters
Selective separation of single-walled carbon nanotubes in aqueous solution by assembling redox nanoclusters
- Source :
- Nanoscale. 14:953-961
- Publication Year :
- 2022
- Publisher :
- Royal Society of Chemistry (RSC), 2022.
-
Abstract
- The selective separation of soluble and individual single-walled carbon nanotubes (SWCNTs) in aqueous solution is a key step for harnessing the extraordinary properties of these materials. Manipulating the strong van der Waals intertube interactions between the SWCNT bundles is very important in selective separation, which is a long-standing challenge. Here we reported the ability of redox polyoxometalate clusters to modulate the intertube π-π stacking interaction through electron transfer and achieved the diameter-selective separation of SWCNTs in a surfactant aqueous solution. The large-diameter SWCNTs concentrated at ∼1.3-1.4 nm were selectively separated when ∼1 nm clusters encapsulated within the tube cavity, and the dispersion of subnanometer ∼0.7-0.9 nm SWCNTs was boosted when clusters were adsorbed on the outer surface of small-diameter nanotubes. The mechanism of diameter-selective separation of SWCNTs associated with the size-dependent interaction between cluster-tubes and the steric hindrance effect of clusters was revealed by optical absorption and Raman spectroscopy. This simple method thus enables the selective separation of individual high-quality SWCNTs in aqueous solutions without harsh sonication with the potential for other separation applications.
Details
- ISSN :
- 20403372 and 20403364
- Volume :
- 14
- Database :
- OpenAIRE
- Journal :
- Nanoscale
- Accession number :
- edsair.doi.dedup.....5fac2f267f12bc183d25ce9d78936b99
- Full Text :
- https://doi.org/10.1039/d1nr04019g