Synthesis and characterization of well-dispersed multi-walled carbon nanotube/low-bandgap poly(3,4-alkoxythiophene) nanocomposites

Cheng Dar Liu, De Yu Shu, Ching Ting Tsao, Jin Lin Han, Feng Yu Tsai, Fang-Chung Chen, Wen Chang Chen, Kuo Huang Hsieh*

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Scopus citations


In this study, we prepared nanocomposites of multi-walled carbon nanotubes (MWCNTs) and low-energy-bandgap conjugated polymers incorporating 3,4-alkoxythiophene monomers. Poly(3,4-dihexyloxythiophene) (PDHOT) and poly(3,4-dimethoxythiophene-co-3,4-dihexyloxythiophene) [P(DMOT-co-DHOT)] have relatively low-energy-bandgaps (ca. 1.38 and 1.34eV, respectively), determined from the onsets of absorbances in their UV-Vis spectra, because of the electron-donating effects of their alkoxy groups. MWCNTs have poor solubility in common organic solvents; after surface modification with alkyl side chains using the Tour reaction, however, the p-hexylaniline modified MWCNT derivative (MWCNT-HA) was readily dispersed in CHCl3 and could be mixed with the low bandgap polymers. Scanning electron microscopy images revealed that MWCNT-HA was dispersed well in each polythiophene derivative; only a few MWCNT-HA bundles could be observed at a high MWCNT-HA content (≧20wt.%). The electrical conductivities of the MWCNTs/PDHOT composites were dependent on their MWCNT content, reaching 16S/cm at 30wt.% MWCNT-HA. We suspect that the two hexyloxy chains of PDHOT enhanced its solubility and allowed it to wrap around the surfaces of the MWCNTs more readily.

Original languageEnglish
Pages (from-to)1242-1248
Number of pages7
JournalComposites Science and Technology
Issue number8
StatePublished - 1 Aug 2010


  • A. Carbon nanotubes
  • A. Polymer-matrix composites (PMCs)
  • D. Raman spectroscopy
  • D. Scanning electron microscopy (SEM)
  • D. Transmission electron microscopy (TEM)

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