Premium
Design of Dispersants for the Dispersion of Carbon Nanotubes in an Organic Solvent
Author(s) -
Kim K. K.,
Yoon S.M.,
Choi J.Y.,
Lee J.,
Kim B.K.,
Kim J. M.,
Lee J.H.,
Paik U.,
Park M. H.,
Yang C. W.,
An K. H.,
Chung Y.,
Lee Y. H.
Publication year - 2007
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200600915
Subject(s) - dispersant , materials science , carbon nanotube , oligomer , dispersity , raman spectroscopy , thiophene , solvent , dispersion (optics) , chemical engineering , monomer , polymer chemistry , organic chemistry , polymer , nanotechnology , composite material , chemistry , optics , physics , engineering
The effect of dispersant structures for dispersing single‐walled carbon nanotubes (SWCNTs) is investigated. The monomer 3‐hexylthiophene is used as the starting material for the development of a series of oligomers that are used to disperse SWCNTs in an organic solvent. The series is obtained by varying the number of head groups, the regioregularity of head groups, and the head‐to‐tail ratios of the hexyl group in the oligomers. The SWCNT solutions are characterized with UV‐vis–near‐IR spectroscopy and transmission electron microscopy. An increase in the number of head groups improves the dispersity of SWCNTs, and a regioregular oligomer plays an important role in dispersing SWCNTs. Furthermore, Raman spectroscopy and X‐ray photoelectron spectroscopy shows that the sulfur atom head groups enhance interactions between the thiophenes and the SWCNT walls. The analysis demonstrated that a well‐designed thiophene oligomer could afford well‐dispersed SWCNT solutions with long‐term dispersion stability, even with an extremely low dispersant concentration (weight ratio of CNTs/dispersant is one and the dispersant concentration is 0.1 g L –1 ).