A non-conjugated polymeric poly(acrylic acid) (PAA) is shown to efficiently form a stable composite with multi-walled carbon nanotubes (MWNTs). The prepared PAA-wrapped MWNTs composite is readily soluble and stable in water. The PAA-MWNTs composite exhibits interesting optical properties. FT-IR spectra show that the characteristic peaks for MWNTs are unchanged, and new chemical bonds are not formed in PAA-MWNTs, indicating that the electronic structures of the MWNTs are still intact after polymer wrapping. The obvious blue-shift of the peak at 266nm for the C ≤ C double bonds of pristine MWNTs upon polymer-wrapping, the systematic upshift in peak position and the enhancement in the band intensities of characteristic Raman bands of MWNTs after winding with PAA as well as the disappearance of 1H NMR spectra for the wrapped polymer in PAA-MWNTs composite were observed, which indicate that there is strong binding of PAA to MWNTs surface via the hydropholic attraction between PAA and MWNTs. The as-prepared PAA-MWNTs dispersions could facilitate the processing of the nanotubes into composites with high nanotube loading for bioelectronic devices and biological applications where a water-based environment is needed.
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
- Electrical and Electronic Engineering