Growth Properties of Carbon Nanowalls on Nickel and Titanium Interlayers

Abstract

This research is conducted in order to investigate the structural and electrical characteristics of carbon nanowalls (CNWs) according to the sputtering time of interlayers. The thin films were deposited through RF magnetron sputtering with a 4-inch target (Ni and Ti) on the glass substrates, and the growth times of the deposition were 5, 10, and 30 min. Then, a microwave plasma-enhanced chemical vapor deposition (PECVD) system was used to grow CNWs on the interlayer-coated glass substrates by using a mixture of H2 and CH4 gases. The FE-SEM analysis of the cross-sectional and planar images confirmed that the thickness of interlayers linearly increased according to the deposition time. Furthermore, CNWs grown on the Ni interlayer were taller and denser than those grown on the Ti interlayer. Hall measurement applied to measure sheet resistance and conductivity confirmed that the electrical efficiency improved significantly as the Ni or Ti interlayers were used. Additionally, UV-Vis spectroscopy was also used to analyze the variations in light transmittance; CNWs synthesized on Ni-coated glass have lower average transmittance than those synthesized on Ti-coated glass. Based on this experiment, it was found that the direct growth of CNW was possible on the metal layer and the CNWs synthesized on Ni interlayers showed outstanding structural and electrical characterizations than the remaining interlayer type.

Carbon Nanowalls as Anode Materials with Improved Performance Using Carbon Nanofibers

“…In this study, carbon nanowalls (CNWs), one of the carbon allotropes, were synthesized with carbon nanofibers (CNFs) to fabricate a new structured carbon anode material using carbon-based nanomaterials. CNWs are composed Nanomaterials 2023, 13, 2622 2 of 10 of vertical growth structures, and are considered suitable for use as anode materials due to their large specific surface area and low resistance [13][14][15]. However, if CNWs are used alone as an anode material, the vertically grown carbon walls of CNWs can collapse due to electrochemical reactions that occur during the charging and discharging process of lithium-ion batteries.…”

Investigation of the Properties of Anode Electrodes for Lithium–Ion Batteries Manufactured Using Cu, and Si-Coated Carbon Nanowall Materials

“…It is interesting to observe that simple adjustments to the synthesis process lead to the production of carbon nanowalls (CNWs) instead of CNTs [10]. Carbon nanowalls possess a distinctive structure with vertically developed graphene walls, which offer excellent electrical conductivity, and quickly moving electrons because of their massive graphene surface area [11][12][13][14]. The latest research also reveals that reversible capacities for carbon nanowalls can extend from 300 to 700 mAhg −1 .…”