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- W1494909355 abstract "Single walled carbon nanotubes exhibit metallic or semiconducting characters, depending on how to roll-up graphene sheet (Iijima, 1991; Iijima & Ichihashi, 1993; Dresselhaus et al., 1996; Saito et al., 1998). In addition of the unique electronic properties, functionalization of nanotubes can expand the versatility because of enhancing their solubility as well as feature expansion by attached functional groups (Hirsch, 2002; Haddon, 2002; Niyogi et al., 2002; C.A. Dyke & Tour, 2004; Tasis et al., 2006; Prato et al, 2008; Vzquez & Prato, 2009; Strano et al., 2009; Karousis et a;., 2010). The functionalization is roughly categorized into two types; noncovalentand covalent-functionalization. In covalent functionalization, only highly reactive reagents are available. In a pioneering paper discussing the covalent bond formation, Haddon et al. reported that nanotubes were successfully functionalized by a divalent carbene-derivative CCl2 (Chen et al., 1998; Chen et al., 1998; Kamaras et al., 2003). In the experiments, its divalent atom binds into two carbon atoms of a nanotube surface. After the publication, different types of cyclopropanized nanotube were generated by a single Bingel reaction (Coleman et al., 2003; Worsley et al., 2004; Umeyama et al., 2007). Note that Bingel reaction has been also utilized for selective functionalization of fullerenes (Diederich & Thilgen, 1996). Another type of covalent functionalization of nanotubes is radical additions. In this case, radical species, whose precursors are alkyhalides, diazonium salts, alky-lithium and so on, can make one covalent bond with a nanotube surface (Holzinger et al., 2001; Bahr & Tour , 2001; Bahr et al., 2001; Bahr et al., 2001; Ying et al., 2003; Saini et al., 2003; Peng et al., 2003; Stevens et al., 2003; Peng et al., 2003). From a viewpoint of the electronic properties of nanotubes, covalent functionalization can modulate their band structures. If their bands in the vicinity of the Fermi level are significantly perturbed upon the functionalization, one can detect a sizable change of physically observable values, such as the conductivity. Recent theoretical studies evaluated the conductance of monovalent or divalent functionalized nanotubes (Park et al., 2006; Lee & Marzari, 2006; Lpez-Bezanilla et al., 2009). The theoretical findings suggested that divalent functionalization can preserve the conductance of its pristine nanotube, whereas monovalent case destroys it (Park et al., 2006; Lpez-Bezanilla et al., 2009). The theoretical" @default.
- W1494909355 created "2016-06-24" @default.
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- W1494909355 date "2011-07-27" @default.
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- W1494909355 title "A Density Functional Theory Study of Chemical Functionalization of Carbon Nanotubes; Toward Site Selective Functionalization" @default.
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- W1494909355 doi "https://doi.org/10.5772/16618" @default.
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