In order to prepareMWCNT/DMF/NA suspension in a first stage, 2 mg of MWCNT wasmixed with 1mL of DMF and sonicated in an ultrasonic bath for 30 min and stirred every 5 min on vortex for 10 s. Then, 50 μL of MWCNT/DMF suspension was added to 450 μL of NA and performed the same procedure of sonication. All dispersions were conducted in duplicate.