通过简便的化学处理方法再生 MXene,ACS Applied Materials & Interfaces

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通过简便的化学处理方法再生 MXene
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-11-03 , DOI: 10.1021/acsami.2c13993
Phuong Huyen Nguyen ₁ , Duc Hieu Nguyen ₂ , Donghyoung Kim ₁ , Mun Kyoung Kim _{1,

3} , Jiseong Jang ₂ , Woo Hyeong Sim _{1,

3} , Hyung Mo Jeong _{1,

3} , Gon Namkoong ₄ , Mun Seok Jeong ₅

Affiliation

碳化钛 (Ti ₃ C ₂ T _x ) 是 MXene 家族中的一种流行物质，主要由于其高金属导电性、易溶液加工性和环境友好性而受到广泛关注。然而，MXene 较差的耐氧性阻碍了其实际应用的实现。尽管对提高 MXene 的氧化稳定性进行了重大尝试，但对氧化机制的全面了解仍然难以捉摸，因此回收氧化 MXene 的最佳策略仍有待商榷。在这里，通过开发一种简便的氢氟酸 (HF) 后处理方法，我们揭示了氧化的 Ti ₃ C ₂ T _{x的再生动力学}. 结合使用拉曼光谱、扫描电子显微镜、X 射线衍射仪和 X 射线光电子能谱进行的系统而广泛的研究表明，HF 后处理对于恢复 MXene 纳米片的结构/形态和表面组成至关重要。这些归因于氧化剂去除动力学，而氟化衍生物中无定形碳和 Ti(III) 的产生提供了有效的导电性。我们的研究结果表明，HF 后处理足以避免和减少降解过程，同时保持较长时间的导电性，这不仅具有经济优势，而且为 Ti ₃ C ₂ T _{x的合理设计向前迈进了一步}基于设备和功能涂层。

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Regenerating MXene by a Facile Chemical Treatment Method

A popular substance in the MXene family, titanium carbide (Ti₃C₂T_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 Ti₃C₂T_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 Ti₃C₂T_x-based devices and functional coatings.

更新日期：2022-11-03

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