| Autor: |
Nguyen PH; Department of Smart-Fab. Technology, Sungkyunkwan University, Suwon16419, Republic of Korea., Nguyen DH; Department of Energy Science, Sungkyunkwan University, Suwon16419, Republic of Korea., Kim D; Department of Smart-Fab. Technology, Sungkyunkwan University, Suwon16419, Republic of Korea., Kim MK; Department of Smart-Fab. Technology, Sungkyunkwan University, Suwon16419, Republic of Korea.; School of Mechanical Engineering, Sungkyunkwan University, Suwon16419, Republic of Korea., Jang J; Department of Energy Science, Sungkyunkwan University, Suwon16419, Republic of Korea., Sim WH; Department of Smart-Fab. Technology, Sungkyunkwan University, Suwon16419, Republic of Korea.; School of Mechanical Engineering, Sungkyunkwan University, Suwon16419, Republic of Korea., Jeong HM; Department of Smart-Fab. Technology, Sungkyunkwan University, Suwon16419, Republic of Korea.; School of Mechanical Engineering, Sungkyunkwan University, Suwon16419, Republic of Korea., Namkoong G; Department of Electrical and Computer Engineering, Old Dominion University, Applied Research Centre, 12050 Jefferson Avenue, Newport News, Virginia23606, United States., Jeong MS; Department of Physics, and Department of Energy Engineering, Hanyang University, Seoul04763, Republic of Korea. |
| Abstrakt: |
A popular substance in the MXene family, titanium carbide (Ti 3 C 2 T x ), 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 Ti 3 C 2 T x . 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 Ti 3 C 2 T x -based devices and functional coatings. |
