期刊
ACS NANO
卷 11, 期 2, 页码 2284-2303出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b00609
关键词
iron oxide; magnetic nanoparticles; magnetic dead layer; oxygen; thermal decomposition; magnetic diameter
类别
资金
- University of Florida
- NIH [R01AR068424, R21EB018453]
- National Science Foundation [DMR-1157490]
- State of Florida
- David and Lucile Packard Foundation
- NSF MRSEC program [DMR-1120296]
- NSF GRFP [DGE-1144153]
Decades of research focused on size and shape control of iron oxide nanoparticles have led to methods of synthesis that afford excellent control over physical size and shape but comparatively poor control over magnetic properties. Popular synthesis methods based on thermal decomposition of organometallic precursors in the absence of oxygen have yielded particles with mixed iron oxide phases, crystal defects, and poorer than expected magnetic properties, including the existence of a thick magnetically dead layer experimentally evidenced by a magnetic diameter significantly smaller than the physical diameter. Here, we show how single-crystalline iron oxide nanoparticles with few defects and similar physical and magetic diameter distributions can be obtained by introducing molecular oxygen as one of the reactive species in the thermal decomposition synthesis. This is achieved without the need for any postsynthesis oxidation or thermal annealing. These results address a significant challenge in the synthesis of nanoparticles with predicatable mabnetic properties and could lead to advance in application of magnetic nanoparticles.
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