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Open Access Nano Express

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

Sang-Wook Han1, Se-Jin Oh1, Loon-Seng Tan2 and Jong-Beom Baek3*

Author Affiliations

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

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Nanoscale Research Letters 2009, 4:766-772  doi:10.1007/s11671-009-9308-8

Published: 5 May 2009

Abstract

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.

Keywords:
Single-walled carbon nanotube; Purification; Grafting; Polyphosphoric acid; Phosphorous pentoxide