具有高导电性和出色机械强度的 Ti3C2TX MXene 的快速、高产率无水合成,Small

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具有高导电性和出色机械强度的 Ti3C2TX MXene 的快速、高产率无水合成
Small ( IF 13.0 ) Pub Date : 2022-09-07 , DOI: 10.1002/smll.202203767
Taegon Oh ₁ , Seungjun Lee _{1,

2} , Hyerim Kim ₁ , Tae Yun Ko ₁ , Seon Joon Kim _{1,

3} , Chong Min Koo _{1,

2,

3,

4,

5}

Affiliation

二维过渡金属碳化物或氮化物 (MXenes) 因其物理化学性质而引起了材料科学家和工程师的极大关注。目前，MXenes 是使用 HF 水溶液从 MAX 相前体合成的。在这里，为了提高 MXenes 的产量，提出了一种无水蚀刻溶液，由二甲亚砜作为高沸点溶剂、NH ₄ HF ₂作为蚀刻剂、CH ₃ SO ₃ H 作为酸和 NH ₄ PF组成₆作为插入剂。反应温度可升高至100℃以加速Ti ₃ AlC _{2的蚀刻和分层}最大晶体；此外，所产生的 Ti ₃ C ₂ T _x MXene 的破坏性副反应在蚀刻剂中得到抑制。因此，在 100 °C 下，蚀刻反应在 4 小时内完成，并生成高质量的单层 Ti ₃ C ₂ T _x，电导率为 8200 S cm ^-1，产率超过 70%。通过这种改进的合成方法制造的Ti ₃ C ₂ T _x MXene 与在水性 HF _{2中合成的 Ti}₃ C ₂ T _{x相比，表现出不同的表面结构和特性，这是由更多的 F 末端引起的}_{T. Ti 3} C ₂ T _x MXene的非典型表面结构导致极高的极限拉伸强度 (167 ± 8 MPa)，是在 HF 水溶液中合成的Ti ₃ C ₂ T _x MXene的五倍（ 31.7 ± 7.8 兆帕）。

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

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 Ti₃C₂T_x MXene is suppressed in the etchant. Consequently, the etching reaction is completed in 4 h at 100 °C and produces high-quality monolayer Ti₃C₂T_x with an electrical conductivity of 8200 S cm⁻¹ and yield of over 70%. The Ti₃C₂T_x MXene fabricated via this modified synthesis exhibits different surface structures and properties arising from more F-terminations than those of Ti₃C₂T_x synthesized in aqueous HF₂T. The atypical surface structure of Ti₃C₂T_x MXene results in an exceptionally high ultimate tensile strength (167 ± 8 MPa), which is five times larger than those of Ti₃C₂T_x MXenes synthesized in aqueous HF solution (31.7 ± 7.8 MPa).

更新日期：2022-09-07

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