Poly(N-vinyl carbazole)-grafted multiwalled carbon nanotubes: Synthesis via direct free radical reaction and optical limiting properties |
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Authors: | Hui-Xia Wu Xue-Qiong Qiu Shi-Xiong Qian |
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Affiliation: | a Department of Chemistry, Shanghai Normal University, Shanghai 200234, People's Republic of China b Department of Chemistry, Fudan University, Shanghai 200433, People's Republic of China c Department of Physics, Fudan University, Shanghai 200433, People's Republic of China |
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Abstract: | In this work, samples of poly(N-vinyl carbazole) (PVK)-grafted multiwalled carbon nanotubes (MWCNTs) were synthesized via free radical reaction. The ready-made PVK was allowed to react directly with MWCNTs at 70 °C in the presence of azo-bis-isobutyronitrile (AIBN). The purified deep grey products, which can dissolve in common organic solvents such as chloroform and 1,2-dichlorobenzene (DCB), were then characterized by FTIR spectra, TEM, TGA, elemental analysis, XPS, UV-vis spectra and Raman spectra. It was confirmed that PVK chains were grafted onto the surface of the carbon nanotubes (CNTs). The optical limiting properties of these PVK-grafted MWCNTs samples were investigated by open-aperture z-scan method. All of the samples of PVK-modified carbon nanotubes in chloroform showed optical limiting behavior better than that of C60 in toluene. |
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Keywords: | 82.30.Cf 82.35.&minus x 78.67.Ch |
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