Journal of Colloid and Interface Science, Vol.464, 117-125, 2016
A new designed pi conjugated molecule for stable single walled carbon nanotube dispersion in aqueous medium
A molecule with a pi conjugated backbone built from aromatic thiophene and dialkoxyphenyiene units and substituted imidazolium groups (TPO) is designed to obtain ultra-stable single walled carbon nanotube (SWCNT) dispersion in aqueous medium. The proposed mechanism of non-covalent interaction is accompanied by individualization of SWCNT and comprises of dominant nondisruptive pi-pi and cation-pi interaction between them and the TPO conjugated oligomer. The individualization of SWCNT and dispersibility and stability of the ultra-stable suspensions were estimated using high resolution transmission electron microscopy, UV-Visible-NIR absorption spectroscopy, Raman spectroscopy, photoluminescence and zeta potential measurement. Nuclear magnetic resonance data provides direct evidence toward possible cation-pi interaction. (C) 2015 Elsevier Inc. All rights reserved.