Abstract

In this work, the dielectric barrier discharge (DBD) humid air plasma was employed for the functionalization of hydrophobic MWCNTs. Effects of different process variables such as voltage, frequency, and processing time of the air-water plasma on the functionalization process were investigated by Fourier transform infrared (FT-IR) analysis. The energy-dispersive X-ray spectroscopy (EDS), Scanning Electron Microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and X-ray diffraction (XRD) were used to characterize functionalized MWCNTs. The stability of the plasma-treated MWCNTs in aqueous solutions was investigated by Ultraviolet-visible (UV-Vis) spectroscopy. At the optimum operating condition, the air-water plasma functionalization technique leads to the highest concentrations of hydrophilic functional groups on the surface structure of the MWCNTs at the frequency of 7 KHz and voltage of 10 kV for 8 minutes. According to the presented results, the dispersion and stability of the MWCNTs in the aqueous solution significantly enhanced by using the proposed eco-friendly humid air plasma functionalization technique.

摘要

在这项工作中，介质阻挡放电 (DBD) 湿空气等离子体用于疏水 MWCNTs 的功能化。通过傅里叶变换红外 (FT-IR) 分析研究了空气-水等离子体的电压、频率和处理时间等不同工艺变量对功能化过程的影响。能量色散 X 射线光谱 (EDS)、扫描电子显微镜 (FE-SEM)、X 射线光电子能谱 (XPS)、拉曼光谱和 X 射线衍射 (XRD) 用于表征功能化的多壁碳纳米管。通过紫外-可见 (UV-Vis) 光谱研究等离子体处理的 MWCNT 在水溶液中的稳定性。在最佳运行条件下，空气-水等离子体功能化技术在 7 KHz 的频率和 10 kV 的电压下持续 8 分钟，在 MWCNT 的表面结构上产生最高浓度的亲水性官能团。根据所呈现的结果，通过使用所提出的环保湿空气等离子体功能化技术，MWCNTs 在水溶液中的分散性和稳定性显着增强。