Fabrication of Ti3C2Tx MXene Transparent Thin Films with Tunable Optoelectronic Properties
Fabrication of Ti3C2Tx MXene Transparent Thin Films with Tunable Optoelectronic Properties
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DOI：
10.1002/aelm.201600050
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发表时间：
2016-06-01
影响因子：
6.2
通讯作者：
Gogotsi, Yury
中科院分区：
文献类型：
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作者：
Hantanasirisakul, Kanit;Zhao, Meng-Qiang;Gogotsi, Yury
MXenes是一类新型的2D过渡金属碳化物和碳氮化物，在超级电容器、锂离子电池、燃料电池和传感器应用中显示出巨大的前景。它们的金属导电性、亲水表面和优异的机械性能的独特组合使它们对于透明导电电极应用具有吸引力。在这里，提出了一种简单的，可扩展的方法来制造透明导电薄膜，使用分层的Ti 3C 2 MXene薄片通过喷涂。如扫描电子显微镜和原子力显微镜所示，在环境条件下在大面积上产生5-70 nm厚的均匀膜。薄层电阻（R-s）分别在40%至90%透射率下在0.5至8 k Ω sq（-1）的范围内，这对应于约0.5-0.7的品质因数（电子电导率与光学电导率之比，sigma（DC）/sigma（opt））。还制备了柔性、透明和导电膜，并且在高达5 mm的弯曲半径下表现出稳定的R-s值。此外，通过阳离子的化学或电化学嵌入来调节膜的光电性质。该薄膜在电化学嵌入/脱嵌过程中，在紫外-可见光区的透射率的可逆变化。这项工作显示了MXene在电子，电致变色和传感器应用中用作透明导体的潜力。
MXenes, a new class of 2D transition metal carbides and carbonitrides, show great promise in supercapacitors, Li-ion batteries, fuel cells, and sensor applications. A unique combination of their metallic conductivity, hydrophilic surface, and excellent mechanical properties renders them attractive for transparent conductive electrode application. Here, a simple, scalable method is proposed to fabricate transparent conductive thin films using delaminated Ti3C2 MXene flakes by spray coating. Homogenous films, 5-70 nm thick, are produced at ambient conditions over a large area as shown by scanning electron microscopy and atomic force microscopy. The sheet resistances (R-s) range from 0.5 to 8 k Omega sq(-1) at 40% to 90% transmittance, respectively, which corresponds to figures of merit (the ratio of electronic to optical conductivities, sigma(DC)/sigma(opt)) around 0.5-0.7. Flexible, transparent, and conductive films are also produced and exhibit stable R-s values at up to 5 mm bend radii. Furthermore, the films' optoelectronic properties are tuned by chemical or electrochemical intercalation of cations. The films show reversible changes of transmittance in the UV-visible region during electrochemical intercalation/deintercalation of tetramethylammonium hydroxide. This work shows the potential of MXenes to be used as transparent conductors in electronic, electrochromic, and sensor applications.