期刊
CHEMISTRY-AN ASIAN JOURNAL
卷 8, 期 1, 页码 290-295出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201200950
关键词
alloys; graphitic shell; magnetic resonance; mesoporous materials; nanoparticles
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2011-0002773, 2012-0004082, 2012R1A1A2039944]
- KBSI [T32404]
- Basic Science Research Program through the NRF of Korea
We have synthesized ultrasmall and uniform FexCo1-x/graphitic carbon shell (FexCo1-x/GC) nanocrystals (x=0.13, 0.36, 0.42, 0.50, 0.56, and 0.62, respectively) with average diameters of <4 nm by thermal decomposition of metal precursors in approximately 60 nm MCM-41 and methane CVD. The composition of the FexCo1-x/GC nanocrystals can be tuned by changing the Fe:Co ratios of the metal precursors. The FexCo1-x/GC nanocrystals show superparamagnetic properties at room temperature. The Fe0.50Co0.50/GC, Fe0.56Co0.44/GC, and Fe0.62Co0.38/GC nanocrystals have a single bcc FeCo structure, whereas the Fe0.13Co0.87/GC, Fe0.36Co0.64/GC, and Fe0.42Co0.58/GC nanocrystals have a mixed structure of bcc FeCo and fcc Co. The single bcc-phased FexCo1-x/GC nanocrystals functionalized with phospholipid-poly(ethylene glycol) (PL-PEG) in phosphate buffered saline (PBS) are demonstrated to be excellent T-1 MRI contrast agents.
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