TY - JOUR
T1 - Chemical synthesis of two-dimensional iron chalcogenide nanosheets
T2 - FeSe, FeTe, Fe(Se,Te), and FeTe2
AU - Oyler, Karl D.
AU - Ke, Xianglin
AU - Sines, Ian T.
AU - Schiffer, Peter
AU - Schaak, Raymond E.
PY - 2009/8/11
Y1 - 2009/8/11
N2 - 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 β-FeSe and related solid solutions. This paper reports a low-temperature solution chemistry route to the synthesis of β-FeSe, β-FeTe, FeTe2, and several members of the β-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 twodimensional single-crystal nanosheets with thicknesses of approximately 2-3 nm and edge lengths ranging from 200 nm to several micrometers. FeTe2 forms a mixture of nanosheets and onedimensional sheet-derived nanostructures. None of the samples are superconducting, which could be due to size effects, nonstoichiometry, or low-level impurities.
AB - 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 β-FeSe and related solid solutions. This paper reports a low-temperature solution chemistry route to the synthesis of β-FeSe, β-FeTe, FeTe2, and several members of the β-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 twodimensional single-crystal nanosheets with thicknesses of approximately 2-3 nm and edge lengths ranging from 200 nm to several micrometers. FeTe2 forms a mixture of nanosheets and onedimensional 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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U2 - 10.1021/cm901150c
DO - 10.1021/cm901150c
M3 - Article
AN - SCOPUS:68149091711
SN - 0897-4756
VL - 21
SP - 3655
EP - 3661
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 15
ER -