Noncovalent functionalization of SWNTs with azobenzene-containing polymers: Solubility, stability, and enhancement of photoresponsive properties

Chakkooth Vijayakumar, Bijitha Balan, Mi Jeong Kim, Masayuki Takeuchi

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)

Abstract

Azobenzene-derived photoactive polymers (P1-P3) containing pyrene pendants were designed and synthesized (Mw ∼ 30-000) for the noncovalent functionalization of single-walled carbon nanotubes (SWNTs). P1-P3 were found to be highly effective for the solubilization of SWNTs in common organic solvents, resulting in hybrid materials with enhanced thermal stability. The solubilization process was mostly driven by the π-π stacking interactions of pyrene with SWNTs. It also brings the azobenzene chromophores to the vicinity of nanotube surface, thereby allowing the electronic interactions between them. In addition to that, stacking of the pyrene and subsequent wrapping of the polymer around CNT surface provides more volume for the photoisomerization of azobenzene. These effects eventually accelerate the kinetics of photoisomerization of azobenzene in the polymer-SWNT composite. The photoalignment property of the composite was also increased when compared to that of the parent polymer which was studied by means of photoinduced birefringence.

Original languageEnglish
Pages (from-to)4533-4539
Number of pages7
JournalJournal of Physical Chemistry C
Volume115
Issue number11
DOIs
Publication statusPublished - 2011 Mar 24
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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