Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 20, Pages 7189-7192Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja412654c
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Funding
- Ministry for Health, Welfare Family Affairs [A110191]
- National Research Foundation of Korea (NRF) - Ministry of Education [2013004637]
- Center for Solar and Thermal Energy Conversion, an Energy Frontier Research Center under U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0000957]
- NSF [ECS-0601345, EFRI-BSBA 0938019, CBET 0933384, CBET 0932823, CBET 1036672]
- ARO MURI [W911NF-12-1-0407]
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Iron chalcogenides hold considerable promise for energy conversion and biomedical applications. Realization of this promise has been hindered by the lack of control over the crystallinity and nanoscale organization of iron chalcogenide films. High-quality nanoparticles (NPs) from these semiconductors will afford further studies of photophysical processes in them. Phase-pure NPs from these semiconductors can also serve as building blocks for mesoscale iron chalcogenide assemblies. Herein we report a synthetic method for FeSex (x = 1, 2) NPs with a diameter of ca. 30 nm that satisfy these needs. The high crystallinity of the individual NPs was confirmed by transmission electron microscopy (TEM) and energy-dispersive X-ray analysis. TEM tomography images suggest pucklike NP shapes that can be rationalized by bond relaxation at the NP edges, as demonstrated in large-scale atomic models. The prepared FeSex NPs display strong photoluminescence with a quantum yield of 20%, which was previously unattainable for iron chalcogenides. Moreover, they also show strong off-resonant luminescence due to two-photon absorption, which should be valuable for biological applications.
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