期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 8, 页码 2830-2834出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201510029
关键词
chalcogenides; layered compounds; metastable compounds; nanostructures; transition-metal dichalcogenides
资金
- U.S. National Science Foundation [DMR-1305564]
- U.S. Army Research Office MURI grant [W911NF-11-1-0362]
- Brazilian agency FAPEMIG
- National Science Foundation CAREER Award [1453924]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1305564] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1453924] Funding Source: National Science Foundation
Molybdenum ditelluride, MoTe2, is emerging as an important transition-metal dichalcogenide (TMD) material because of its favorable properties relative to other TMDs. The 1T' polymorph of MoTe2 is particularly interesting because it is semimetallic with bands that overlap near the Fermi level, but semiconducting 2H-MoTe2 is more stable and therefore more accessible synthetically. Metastable 1T'-MoTe2 forms directly in solution at 300 degrees C as uniform colloidal nanostructures that consist of few-layer nanosheets, which appear to exhibit an approx. 1% lateral lattice compression relative to the bulk analogue. Density functional theory calculations suggest that small grain sizes and polycrystallinity stabilize the 1T' phase in the MoTe2 nanostructures and suppress its transformation back to the more stable 2H polymorph through grain boundary pinning. Raman spectra of the 1T'-MoTe2 nanostructures exhibit a laser energy dependence, which could be caused by electronic transitions.
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