MXenes公司
材料科学
氧化剂
拉曼光谱
X射线光电子能谱
碳化钛
化学工程
纳米技术
氢氟酸
合理设计
无定形固体
表面改性
碳化物
有机化学
复合材料
冶金
化学
光学
物理
工程类
作者
Phuong Huyen Nguyen,Duc Hieu Nguyen,Donghyoung Kim,Mun Kyoung Kim,Jiseong Jang,Woo Hyeong Sim,Hyung Mo Jeong,Gon Namkoong,Mun Seok Jeong
标识
DOI:10.1021/acsami.2c13993
摘要
A popular substance in the MXene family, titanium carbide (Ti3C2Tx), has received substantial attention mainly due to its high metallic conductivity, easy solution processability, and environment friendliness. However, the poor oxygen resistance nature of MXene has prevented its practical applications from being realized. Despite significant attempts to improve the oxidative stability of MXenes, a comprehensive understanding of the oxidation mechanism is still elusive, thus leaving an optimal strategy for recycling oxidized MXene in question. Here, by developing a facile hydrofluoric acid (HF) post-treatment, we have unraveled the regeneration kinetics of the oxidized Ti3C2Tx. A systematic and extensive investigation using a combination of Raman spectroscopy, scanning electron microscopy, X-ray diffractometer, and X-ray photoelectron spectroscopy revealed that HF post-treatment is critical for restoring the structure/morphology and surface composition of MXene nanosheets. These are ascribed to the oxidizing agent removal kinetics, while the generation of amorphous carbon and Ti(III) in fluorinated derivatives provides efficient electrical conductivity. Our findings suggested that HF post-treatment is sufficient to evade and reduce the degradation process while maintaining the conductivity for a longer time, which will not only be economically advantageous but also a step forward for the rational design of Ti3C2Tx-based devices and functional coatings.
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