The Effects of Lengths of Flavin Surfactant N -10-Alkyl Side Chains on Promoting Dispersion of a High-Purity and Diameter-Selective Single-Walled Nanotube
Flavin with defined helical self-assembly helps to understand chemical designs for obtaining high-purity semiconducting ( )-single-walled carbon nanotubes (SWNT) in a diameter ( )-selective manner for high-end applications. In this study, flavins containing 8, 12, 16, and 20 -alkyl chains were synth...
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Published in | Nanomaterials (Basel, Switzerland) Vol. 12; no. 19; p. 3380 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Switzerland
MDPI AG
27.09.2022
MDPI |
Subjects | |
Online Access | Get full text |
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Summary: | Flavin with defined helical self-assembly helps to understand chemical designs for obtaining high-purity semiconducting (
)-single-walled carbon nanotubes (SWNT) in a diameter (
)-selective manner for high-end applications. In this study, flavins containing 8, 12, 16, and 20
-alkyl chains were synthesized, and their single/tandem effects on
-selective
-SWNT dispersibility were investigated at isomolarity. Flavins with
-dodecyl and longer chain lengths (FC12, FC16, and FC20) act as good surfactants for stable SWNT dispersions whereas
-octyl flavin (FC8) exhibits poor dispersibility owing to the lack of SWNT buoyancy. When used with small-
SWNT, FC8 displays chirality-selective SWNT dispersion. This behavior, along with various flavin helical motifs, prompts the development of criteria for 'side chain length (
)' required for stable and
-selective SWNT dispersion, which also explains
-dependent
-enrichment behavior. Moreover, SWNT dispersions with flavins with dodecyl and longer
exhibit increased metallic (
)-SWNT, background absorption-contributing carbonaceous impurities (CIs) and preferential selectivity of
-SWNT with slightly larger
. The increased CIs that affect the SWNT quantum yield were attributed to a solubility parameter. Furthermore, the effects of flavin
, sonication bath temperature, centrifugal speed, and surfactant concentration on SWNT purity and
-/
-SWNT ratio were investigated. A tandem FC8/FC12 provides fine-tuning of
-selective SWNT dispersion, wherein the FC8 ratio governs the tendency towards smaller
. Kinetic and thermodynamic assemblies of tandem flavins result in different sorting behaviors in which wide
-tunability was demonstrated using kinetic assembly. This study highlights the importance of appropriate side chain length and other extrinsic parameters to obtain
-selective or high-purity
-SWNT. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 2079-4991 2079-4991 |
DOI: | 10.3390/nano12193380 |