期刊
CHEMISTRY OF MATERIALS
卷 21, 期 15, 页码 3655-3661出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm901150c
关键词
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资金
- U.S. Department of Energy [DE-FG02-08ER46483]
- Penn State MRSEC [DMR-0820404]
- NSF [DMR-0701582]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [820404] Funding Source: National Science Foundation
Transition metal chalcogenides are important materials because of their range of useful properties and applications, including as thermoelectrics, magnetic semiconductors, superconductors, quantum dots. sensors, and photovoltaics. In particular, iron chalcogenides have received renewed attention following the discovery of superconductivity in PbO-type beta-FeSe and related solid solutions. This paper reports a low-temperature solution chemistry route to the synthesis of beta-FeSe, beta-FeTe, FeTe2, and several members of the beta-Fe(Se, Te) solid solution. The samples were analyzed by powder XRD, TEM, EDS, SAED, SEM with elemental mapping. AFM, and SQUID magnetometry. Consistent with the layered crystal structures, the FeSe, FeTe, and Fe(Se,Te) products are predominantly two-dimensional single-crystal nanosheets with thicknesses of approximately 2-3 nm and edge lengths ranging from 200 nm to several micrometers. FeTe, forms a mixture of nanosheets and one-dimensional sheet-derived nanostructures. None of the samples are superconducting, Which Could be due to size effects, nonstoichiometry, or low-level impurities.
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