期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 113, 期 17, 页码 7085-7090出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp900165c
关键词
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资金
- KOSEF [R01-2008-000-10825-0, 2008-02364]
- KRF [2008-314-C00175]
- MKE [2008-C1090-0804-0013]
- Ministry of Public Safety & Security (MPSS), Republic of Korea [C1090-0902-0025] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2008-02364, 2008-0058718, R01-2008-000-10825-0, 과06B1510, 2008-314-C00175] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Vertically aligned CoFe2O4 and 10% Mn-doped CoFe2O4 nanowires were synthesized by the gas-phase reduction/substitution reaction of pregrown alpha-Fe2O3 nanowires. They consisted of perfect single-crystalline cubic structures grown along the [110] direction. The increase of the lattice constant provides evidence for the effective Mn substitution. We investigated their electronic structures using X-ray absorption spectroscopy and X-ray magnetic circular dichroism. The results suggest that as the Mn substitutes, Mn2+/Mn3+ ions would occupy the octahedral (O-h) sites, Mn4+ ions form at the tetrahedral (T-d) sites, and a fraction of the Co2+ ions migrate from the O-h sites to the T-d sites. The effective Mn substitution can increase the hole concentration, which makes it possible to develop humidity sensors operating at room temperature. Furthermore, it induces high photocurrents upon irradiation of visible light.
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