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Issue 41, 2012
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Facile synthesis of halogenated multi-walled carbon nanotubes and their unusual photoluminescence

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Abstract

The facile synthesis of halogenated multi-walled carbon nanotubes with Cl, Br and I under high pressure and high temperature was reported, and the unique photoluminescence of the halogenated carbon nanotubes was investigated by means of experimental and theoretical approaches. The one-step and facile method to incorporate these halogens onto nanotubes’ surface involves high temperature and high pressure using a sealed vessel. This method is easily handled using SOCl2, Br2 and I2 as halogen sources and is accessible for the large-scale production of halogenated carbon nanotubes. The concentration of halogen in the samples by this method reaches up to 3–8% in weight. The UV-Vis photoluminescence of these halogenated carbon nanotubes was observed, and attributed to fluorescence, depending on their lifetimes. The fluorescence of the halogenated carbon nanotubes can be remarkably enhanced by the increase of introduced halogen atoms resulting from prolonging the reaction time. Different species of halogen atoms have little influence on the fluorescence emission behaviour, but affect their fluorescence lifetimes. The fluorescence is more likely to originate from sp2 carbon clusters isolated from sp3 carbons formed by the addition of halogen atoms, but a defect mechanism cannot be excluded from the present results. A series of compounds with different aromatic rings were modelled to predict the size of the isolated sp2 carbon clusters by comparing the calculated excitation and emission maximum wavelengths with their experimental data. Basing on these theoretical results, it is thought that the UV-Vis fluorescence of the halogenated carbon nanotubes may originate from the isolated sp2 carbon clusters containing 4–8 aromatic rings.

Graphical abstract: Facile synthesis of halogenated multi-walled carbon nanotubes and their unusual photoluminescence

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Publication details

The article was received on 02 Jul 2012, accepted on 03 Sep 2012 and first published on 04 Sep 2012


Article type: Paper
DOI: 10.1039/C2JM34275H
J. Mater. Chem., 2012,22, 22113-22119

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    Facile synthesis of halogenated multi-walled carbon nanotubes and their unusual photoluminescence

    Z. Qian, J. Ma, J. Zhou, P. Lin, C. Chen, J. Chen and H. Feng, J. Mater. Chem., 2012, 22, 22113
    DOI: 10.1039/C2JM34275H

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