期刊
ADVANCED MATERIALS
卷 30, 期 44, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201804616
关键词
charge-density-wave; chemical vapor deposition; supercapacitors; tantalum diselenide; wafer-scale
类别
资金
- National Program on Key Basic Research Project [2016YFA0200103, 2014CB921002, 2018YFA0305604, 2017YFA0303302]
- National Natural Science Foundation of China [51472008, 51290272, 51861135201, 11474364, 51290271, 51522212, 51421002, 51672307, 11774008]
- Open Research Fund Program of the State Key Laboratory of Low Dimensional Quantum Physics [KF201601]
- China Postdoctoral Science Foundation [2018M631252]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB07030200]
- Key Research Program of Frontier Sciences, CAS [QYZDB-SSW-JSC035]
- Key Research Program of the Chinese Academy of Sciences [XDPB08-2]
- Fundamental Research Funds for the Central Universities
2D metallic transition metal dichalcogenides (MTMDCs) are benchmark systems for uncovering the dimensionality effect on fascinating quantum physics, such as charge-density-wave (CDW) order, unconventional superconductivity, and magnetism, etc. However, the scalable and thickness-tunable syntheses of such envisioned MTMDCs are still challenging. Meanwhile, the origin of CDW order at the 2D limit is controversial. Herein, the direct synthesis of wafer-scale uniform monolayer 2H-TaSe2 films and thickness-tunable flakes on Au foils by chemical vapor deposition is accomplished. Based on the thickness-tunable 2H-TaSe2, the robust periodic lattice distortions that relate to CDW orders by low-temperature transmission electron microscopy are directly visualized. Particularly, a phase diagram of the transition temperature from normal metallic to CDW phases with thickness by variable-temperature Raman characterizations is established. Intriguingly, dramatically enhanced transition temperature from bulk value approximate to 90 to approximate to 125 K is observed from monolayer 2H-TaSe2, which can be explained by the enhanced electron-phonon coupling mechanism. More importantly, an ultrahigh specific capacitance is also obtained for the as-grown TaSe2 on carbon cloth as supercapacitor electrodes. The results hereby open up novel avenues toward the large-scale preparation of high-quality MTMDCs, and shed light on their applications in exploring some fundamental issues.
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