期刊
CHEMISTRY OF MATERIALS
卷 30, 期 4, 页码 1249-1256出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.7b04382
关键词
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资金
- Swiss Federal Commission for Technology and Innovation (CTI) through the Swiss Competence Centers for Energy Research (SCCER, Heat and Electricity Storage)
- Competence Center for Energy and Mobility (CCEM, Project SLIB)
- European Research Council (ERC) under EU's Horizon 2020 programme [681312]
Colloidal nanoparticles (NPs) with myriads of compositions and morphologies have been synthesized and characterized in recent years. For wustite FexO, however, obtaining phase-pure NPs with homogeneous morphologies have remained challenging. Herein, we report the colloidal synthesis of phase-pure FexO (x approximate to 0.94) popcorn-shaped NPs by decomposition of a single-source precursor, [Fe-3(mu(3)-O)(CF3COO)(mu-CF3COO)(6)(H2O)(2)].CF3COOH. The popcorn shape and multigrain structure had been reconstructed using high-angle annular dark-field scanning transmission electron micrograph (HAADF-STEM) tomography. This morphology offers a large surface area and internal channels and prevents further agglomeration and thermal tumbling of the subparticles. [Fe-3(mu(3)-O)(CF3COO)(mu-CF3COO)(6)(H2O)(2)].CF3COOH behaves as an antiferromagnetic triangle whose magnetic frustration is mitigated by the low symmetry of the complex. The popcorn-shaped FexO NPs show the typical wustite antiferromagnetic transition at approximately 200 K, but behave very differently to their bulk counterpart below 200 K. The magnetization curves show a clear, unsymmetrical hysteresis, which arises from a combined effect of the superparamagnetic behavior and exchange bias.
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