Figure 5.

Experimental standard curves of multi-walled CNT sample 2 and multi-walled CNT sample 3 dispersions in 1,2-dichlorobenzene. Experimentally determined seven-point standard curves of five different stock solutions and an average curve were determined using an ultraviolet-visible near infrared spectrophotometer at a wavelength of 500 nm. Cheaptubes multi-walled carbon nanotube sample 2 in 1,2-dichlorobenzene (P > 0.05) (A) and Cheaptubes multi-walled carbon nanotube sample 3 in 1,2-dichlorobenzene (P > 0.05) (B). Multi-walled carbon nanotube sample 2 had an average extinction coefficient of 51.4 ± 2.9 mL·cm⁻¹· mg⁻¹ and a percentage deviation of 5.6%, meanwhile multi-walled carbon nanotube sample 3 had an average extinction coefficient of 58.0 ± 7.3 mL· cm⁻¹· mg⁻¹ with 12.6% deviation. Note: P values were calculated using one-way analysis of variance with a Tukey multiple comparison post-test for n = 15 at a 95% confidence value.

Abbreviations: SWNT, single-walled carbon nanotubes; MWNT, multi-walled carbon nanotubes.