Nano Express

Nanoscale Research Letters

, 4:766

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

Grafting of 4-(2,4,6-Trimethylphenoxy)benzoyl onto Single-Walled Carbon Nanotubes in Poly(phosphoric acid) via Amide Function

  • Sang-Wook HanAffiliated withSchool of Chemical Engineering, Chungbuk National University
  • , Se-Jin OhAffiliated withSchool of Chemical Engineering, Chungbuk National University
  • , Loon-Seng TanAffiliated withNanostructured and Biological Materials Branch, Materials and Manufacturing Directorate, AFRL/RXBN, Air Force Research Laboratory, Wright-Patterson Air Force Base
  • , Jong-Beom BaekAffiliated withUlsan National Institute of Science and Technology (UNIST), 194 Email author 


Single-walled carbon nanotubes (SWCNTs), which were commercial grade containing 60–70 wt% impurity, were treated in a mild poly(phosphoric acid) (PPA). The purity of PPA treated SWCNTs was greatly improved with or without little damage to SWCNTs framework and stable crystalline carbon particles. An amide model compound, 4-(2,4,6-trimethylphenoxy)benzamide (TMPBA), was reacted with SWCNTs in PPA with additional phosphorous pentoxide as “direct” Friedel–Crafts acylation reaction to afford TMPBA functionalized SWCNTs. All evidences obtained from Fourier-transform infrared spectroscopy, Raman spectroscopy, thermogravimetric analysis, scanning electron microcopy, and transmission electron microscopy strongly supported that the functionalization of SWCNTs with benzamide was indeed feasible.


Single-walled carbon nanotube Purification Grafting Polyphosphoric acid Phosphorous pentoxide