Fabrication and Characterization of MWCNTs by Syngas and Temperature Conditions

Abstract

The morphologies, bulk densities, and synthesis yields of multi‐walled carbon nanotubes (MWCNTs) were analyzed by optimizing the catalyst, syngas, and synthesis temperature, which are key factors in the production of MWCNTs. In addition, MWCNTs were applied to polymer composites, and their electrical conductivities were evaluated through surface resistance measurements. The catalyst used in this process was a deposition precipitation method that offers favorable uniformity of loading through the liquid phase process and provides the advantage of controlling the shape using a support. Furthermore, physical and electrical analyses were performed in the range from 650 to 725°C using ethylene, butane, and liquefied petroleum gas (LPG) syngas. The results showed that the optimal synthesis yield and electrical conductivity of ethylene and butane were observed at 675°C, while those of LPG syngas were observed at 700°C. This implies that the aggregate diameter and bundle length tend to decrease under the most optimal conditions.