(118f) Evaluating the Quality Control of Aqueous Carbon Nanotube Dispersions Using UV-Vis Spectroscopy and Zetasizer Analysis

Currently, researchers are exploring many options to reliably produce and evaluate the quality of carbon nanotube dispersions for manufacturing applications. However, it can be a challenge to determine the quality of these large-scale dispersions quickly and accurately for use in a manufacturing setting. In this research, we will explore the evaluation of multi-walled carbon nanotube (MWCNT) dispersions using a UV-Vis spectrophotometer and a Zetasizer Nano for the creation of a nanofiber/MWCNT sensor. During this work, we determined the quality of MWCNT dispersions that would be suitable for use at a manufacturing site using UV-Vis and a Zetasizer Nano. Carbon nanotube dispersions were produced using bath sonication for 60 minutes or probe tip ultrasonication for 2 or 4 minutes at 24 kHz. These aqueous dispersions were created using 4:1, 6:1, and 10:1 surfactant to MWCNT ratios. The surfactants used for the dispersions were Triton X-100 and Triton X-114. Samples at a concentration of 1:50 (MWCNT dispersion to water) were taken from the dispersion and run through a Shimadzu UV-1800 Scanning Spectrophotometer and a Malvern Zetasizer Nano ZS to determine their quality. Based on preliminary results from the differing types of dispersions, the probe tip ultrasonication with 10:1 Triton X-100 to MWCNT ratio produced the most consistent dispersions.