Chemical synthesis of two-dimensional iron chalcogenide nanosheets: FeSe, FeTe, Fe(Se,Te), and FeTe2

Karl D. Oyler, Xianglin Ke, Ian T. Sines, Peter Schiffer, Raymond E. Schaak

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)3655-3661
Number of pages7
JournalChemistry of Materials
Volume21
Issue number15
DOIs
StatePublished - Aug 11 2009

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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