This study is to obtain the effect of adding hydrochloric acid (HCl) to the mixture of sulfuric acid (H 2 SO 4 ) and HNO 3 in CNT covalent functionalization. HCl expected to increase the dispersibility of functionalized CNT by improving the dispersion time period done with H 2 SO 4 or HNO 3 . Functionalization used mixture of H 2 SO 4 and HNO 3 with volume ratio of 3:1. Covalent functionalization used 0.5 grams of MWCNT ultra sonicated in 50mL HNO 3 with and mixture of H 2 SO 4 and HNO 3 . Additions of 200 mL HCl used variation of molarity from 1M, 2M, 3M, 4M, 5M to 6M. CNT were oxidized to form carboxylic and hydroxyl bonds on the surface that increase dispersibility of CNT. FTIR spectrums showed the existences of carboxyl and hydroxyl group on spectra of 2600-3700 cm -1 and 900-1400 cm -1 . Dispersion tests, which showed functionalized CNT (f-CNT) dispersion capabilities, were done by dissolving f-CNT in water. The study resulted that 6M f-CNT (NSC6) gave the best dispersion with zeta potential value of -37.1mV. NSC6 gave the longest dispersion time which was 20 days until f-CNT settle again. SEM-EDS micrographs showed the surface structure of 6M f-CNT without significant damage and no longer contain impurities of Fe, Ni, and Cl.
|Journal||IOP Conference Series: Materials Science and Engineering|
|Publication status||Published - 28 Mar 2018|
|Event||15th International Conference on Quality in Research, QiR 2017 - Nusa Dua, Bali, Indonesia|
Duration: 24 Jul 2017 → 27 Jul 2017