Chemical functionalization SWCNTs

Campidelli et al. have synthesized interesting linear and hyperbranched porphyrin polymers from CNTs via copper-catalyzed alkyne-azide cycloaddition (CuAAC) [122], Zinc porphyrin monomers containing an azide group and one or three alkyne groups were synthesized and chemically bound to alkyne functionalized SWCNTs via CuAAC. Depending upon the number of alkyne functionalities either linear (single alkyne) or dendrimer-like (triple alkyne) porphyrin polymers were produced (Fig. 5.9) [122],... 

Attaching chemical functionalities to CNTs can improve their solubility and allow for their manipulation and processability [24]. The chemical functionalization can tailor the interactions of nanotubes with solvents, polymers and biopolymer matrices. Modified tubes may have physical or mechanical properties different from those of the original nanotubes and thus allow tuning of the chemistry and physics of carbon nanotubes. Chemical functionalization can be performed selectively, the metallic SWCNTs reacting faster than semiconducting tubes [25]. 

Carboxyl-functionalized SWCNT/PANI In-situ chemical polymerization Drop coating HCI and NH3 [52]... 

SCHEME 14.5 Example of Suzuki coupling to covalently functionalize SWCNTs. Double bonds in NT omitted for clarity. (Adapted from Ref. [164] with permission American Chemical Society, 2006.)... 

Mugadza et al. [58] described the synthesis of conjugates based on carboxylic acid functionalized SWCNTs and 2,(3)-tetra-(4-oxo-benzamide)phthalocyaninato cobalt(II) (CoTOBPc) applied in the detection of amitrole (herbicide). The chemical bonding (imides linkages) that are formed between the CoTOBPc and SWCNTs are... 

It has also been demonstrated that CNT sidewalls can be covalently fluorinated [148 150], or they can be derivatized with certain highly reactive chemicals such as dichlorocarbene [142], In this context, Chen et al. applied derivatization chemistry with thionychloride and octadecylamine in order to obtain organic soluble SWCNTs and later they performed a reaction with dichlorocarbene that led to the covalent functionalization of the nanotube walls. 

The fluorotubes are very soluble and open new routes to solution-phase chemistry. F-SWCNTs can serve as a starting material for a wide variety of chemical sidewall functionalizations (see Section 1.3.1.4). By treatment with hydrazine or LiBH4-LiAlH4, the majority of the covalently bound fluorine could be removed (Scheme 1.1) [29, 41], restoring most of the conductivity and spectroscopic properties of the pristine material. 

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