CNTs (1 g) were dispersed in N-methyl-2-pyrrolidone (150 ml) and sonicated for 0.5 to 1 hour. The dispersion was stirred for 1 to 2 hours at 25°C and cooled down to 0°C. 2,4,6-1,3,5-Trichloro-triazine (10 g, 54 mmol) was dissolved in N-methyl-2-pyrrolidone (50 ml), and the obtained solution was slowly added to the CNTs dispersion at 0°C. Sodium azide (1.76 g, 27 mmol) was added to the mixture and stirred for 2 hours at 0°C followed by 12 hours stirring at 70°C for . The product was purified by centrifugation redispersed in water and different organic solvents (acetone, toluene, and chloroform), and lyophilized for storage and characterization. The triazine functionalization was characterized by elemental analysis, x-ray photoelectron spectroscopy (XPS), thermogravimetric analysis, Raman, and infrared spectroscopy [see (25) for details].

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