Fast and High-Yield Anhydrous Synthesis of Ti3C2Tx MXene with High Electrical Conductivity and Exceptional Mechanical Strength

Taegon Oh, Seungjun Lee, Hyerim Kim, Tae Yun Ko, Seon Joon Kim, Chong Min Koo

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

2D transition metal carbides or nitrides (MXenes) have attracted considerable attention from materials scientists and engineers owing to their physicochemical properties. Currently, MXenes are synthesized from MAX-phase precursors using aqueous HF. Here, in order to enhance the production of MXenes, an anhydrous etching solution is proposed, consisting of dimethylsulfoxide as solvent with its high boiling point, NH4HF2 as an etchant, CH3SO3H as an acid, and NH4PF6 as an intercalant. The reaction temperature can be increased up to 100 °C to accelerate the etching and delamination of Ti3AlC2 MAX crystals; in addition, the destructive side reaction of the produced Ti3C2Tx MXene is suppressed in the etchant. Consequently, the etching reaction is completed in 4 h at 100 °C and produces high-quality monolayer Ti3C2Tx with an electrical conductivity of 8200 S cm−1 and yield of over 70%. The Ti3C2Tx MXene fabricated via this modified synthesis exhibits different surface structures and properties arising from more F-terminations than those of Ti3C2Tx synthesized in aqueous HF2T. The atypical surface structure of Ti3C2Tx MXene results in an exceptionally high ultimate tensile strength (167 ± 8 MPa), which is five times larger than those of Ti3C2Tx MXenes synthesized in aqueous HF solution (31.7 ± 7.8 MPa).

Original languageEnglish
Article number2203767
JournalSmall
Volume18
Issue number46
DOIs
Publication statusPublished - 2022 Nov 17

Bibliographical note

Funding Information:
The authors acknowledge Dr. Sun Hwa Lee from the Institute of Basic Science for the constructive and fruitful discussions. This study was supported by grants from the Basic Science Research Program (2021M3H4A1A03047327 and 2022R1A2C3006277) through the National Research Foundation of Korea, funded by the Ministry of Science, ICT and Future Planning, and the Industrial Strategic Technology Development Program (20020855) funded by the Ministry of Trade, Industry and Energy, Republic of Korea. This work was partially supported by a start-up fund (S-2022-0096-000) from Sungkyunkwan University. This work was supported by grant from the National Research Council of Science & Technology (NST) funded by the Korean Government (MSIT) (CRC22031-000). This work was partially supported by KU-KIST Research and KIST Internal programs, funded by the Korea Institute of Science and Technology (KIST).

Funding Information:
The authors acknowledge Dr. Sun Hwa Lee from the Institute of Basic Science for the constructive and fruitful discussions. This study was supported by grants from the Basic Science Research Program (2021M3H4A1A03047327 and 2022R1A2C3006277) through the National Research Foundation of Korea, funded by the Ministry of Science, ICT and Future Planning, and the Industrial Strategic Technology Development Program (20020855) funded by the Ministry of Trade, Industry and Energy, Republic of Korea. This work was partially supported by a start‐up fund (S‐2022‐0096‐000) from Sungkyunkwan University. This work was supported by grant from the National Research Council of Science & Technology (NST) funded by the Korean Government (MSIT) (CRC22031‐000). This work was partially supported by KU‐KIST Research and KIST Internal programs, funded by the Korea Institute of Science and Technology (KIST).

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

Keywords

  • 2D materials
  • MXenes
  • conductivity
  • mechanical strength
  • synthesis

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • General Chemistry
  • General Materials Science
  • Biotechnology
  • Biomaterials

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