Grafting of 4-(2,4,6-Trimethylphenoxy)benzoyl onto Single-Walled Carbon Nanotubes in Poly(phosphoric acid) via Amide Function
1 School of Chemical Engineering, Chungbuk National University, Cheongju, Chungbuk, 361-763, South Korea
2 Nanostructured and Biological Materials Branch, Materials and Manufacturing Directorate, AFRL/RXBN, Air Force Research Laboratory, Wright-Patterson Air Force Base, Dayton, OH, 45433-7750, USA
3 Ulsan National Institute of Science and Technology (UNIST), 194, Banyeon, Ulsan, 689-805, South Korea
Nanoscale Research Letters 2009, 4:766-772 doi:10.1007/s11671-009-9308-8Published: 5 May 2009
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.