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The grafting of drugs to the single-walled carbon nanotube (SWCNT) was attained by the initial conversion of carboxylic groups in SWCNT to corresponding acyl chlorides. The active acyl chlorides in SWCNT were subsequently mixed with chemotherapeutic agents having NH, NH2, and OH functional groups to afford the formation of relevant amide and ester, respectively. The covalently grafted drugs to SWCNT were identified by infrared and UV–visible spectroscopy and transmission electron microscopy methods. From a clinical aspect, the grafting of drugs to the SWCNT can be used as a new tool and useful method for potential drug delivery in patients.

Sidewall functionalization of single-walled carbon nanotubes (SWCNTs) by the covalent addition of 4-benzo-9-crown-3 ether diazonium salt has been described. The covalent grafting of crown ether has led to a considerable increase in the solubility of SWCNTs in both organic and aquatic solvents such as ethanol, dimethyl sulfoxide, dimethylformamide and water. The highest solubility was attained in DMF and DMSO. The covalently bonded 4benzo-9-crown-3 ether allowed the hosting of Li + . The covalent grafting of crown ether [4-(benzo-9-crown-3)] to SWCNT was identified and confirmed by infrared spectroscopy, transmission electron microscopy, UV/Vis and thermogravimetric analysis methods.

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Functionalization of oxidized single-walled carbon nanotubes (SWCNTs) by a zwitterionic interaction (COO − NH + 3) between protonated amine on crown ether and an oxyanion from a carboxylic acid group on SWCNT has been described. This ionic interaction has led to a considerable increase in the solubility of SWCNTs in both organic and aqueous solvents such as ethanol, dimethyl sulphoxide, dimethylformamide, and H 2 O. The highest solubility was attained in DMF and DMSO. The ionic bonded 4-benzo-9-crown-3 ether allowed the hosting of Li +. The ionic bond of crown ether (4-(benzo-9-crown-3)) to SWCNT was identified and confirmed by infrared spectroscopy, transmission electron-microscopy, atomic force microscopy and thermogravimetric analysis methods.