Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 191, Issue -, Pages 33-40Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mseb.2014.10.009
Keywords
Two-dimensional materials; MXene; Transition metal carbides; Thermal stability; Exfoliation
Funding
- National Nature Science Foundation of China [51472075, 51205111]
- Plan for Scientific Innovation Research Team of Henan Polytechnic University [T2013-4]
- State Key Laboratory of New Ceramic and Fine Processing Tsinghua University [KF201313]
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We investigated the synthesis of quasi-two-dimensional carbide (Ti3C2), with the name of MXene, by immersing Ti3AlC2 in 40% or 49% hydrofluoric acid (HF) at 0 degrees C, 15 degrees C or 60 degrees C. The influences of time, temperature, and source of Ti3AlC2 on the synthesis were researched. It was found that Ti3C2 synthesized from pressureless synthesized Ti3AlC2 was highly oriented compared to that from hot-pressed Ti3AlC2. As-synthesized Ti3C2 could be further exfoliated by intercalation with urea, dimethylsulfoxide or ammonia. From the results of thermogravimetry and differential scanning calorimetry, Ti3C2 MXene with F/OH termination was found to be stable in argon atmosphere at temperature up to 800 degrees C. In oxygen atmosphere, at 200 degrees C, parts of MXene layers were oxidized to obtain an interesting structure: anatase nano-crystals were evenly distributed on 2D Ti3C2 layers. At 1000 degrees C, MXene layers were completely oxidized and anatase phase fully transformed to rutile in oxygen atmosphere. (C) 2014 Elsevier B.V. All rights reserved.
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