Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 140, Issue 29, Pages 9051-9055Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b04829
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Funding
- Russian Science Foundation [16-13-10291]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [392444269]
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Stabilizing nanoparticles on surfaces, such as graphene, is a growing field of research. Thereby, iron particle stabilization on carbon materials is attractive and finds applications in charge-storage devices, catalysis, and others. In this work, we describe the discovery of iron nano particles with the face-centered cubic structure that was postulated not to exist at ambient conditions. In bulk, the gamma-iron phase is formed only above 917 degrees C, and transforms back to the thermodynamically favored alpha-phase upon cooling. Here, with X-ray diffraction and Mossbauer spectroscopy we unambiguously demonstrate the unexpected room-temperature stability of the gamma-phase of iron in the form of the austenitic nanoparticles with low carbon content from 0.60% through 0.93%. The nanoparticles have controllable diameter range from 30 nm through 200 nm. They are stabilized by a layer of Fe/C solid solution on the surface, serving as the buffer controlling carbon content in the core, and by a few-layer graphene as an outermost shell.
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