Journal
NANOTECHNOLOGY
Volume 27, Issue 32, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/27/32/324002
Keywords
iron oxide; magnetite nanocrystals; nanocrystal shape control; nanocrystal size control; superparamagnetic materials; aqueous phase transfer of nanocrystals
Funding
- American Chemical Society's Petroleum Research Fund [52640-DNI10]
- National Science Foundation (NSF) (CBET) [1236653, 1437820]
- US Army Corps of Engineers [W912HZ-13-2-0009-P00001]
- NSF [ECS-0335765]
- US National Science Foundation [EAR-1161543]
- NSF MRSEC Program Award [DMR 1121053]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1236653, 1437820] Funding Source: National Science Foundation
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New, non-hydrolytic routes to synthesize highly crystalline iron oxide nanocrystals (8-40 nm, magnetite) are described in this report whereby particle size and morphology were precisely controlled through reactant (precursor, e.g. (FeO(OH)) ratios, co-surfactant and organic additive, and/or reaction time. Particle size, with high monodispersivity (<10%), is demonstrated to be a function of precursor concentrations and through the addition of different cosurfactants and/or additives, cubic, octahedral, potato-like, and flower-like iron oxide nanocrystals can be reproducibly synthesized through simple one-pot thermal decomposition methods. High resolution transmission electron microscope, x-ray diffraction, and superconducting quantum interference device were used to characterize the size, structure and magnetic properties of the resulting nanocrystals. For aqueous applications, materials synthesized/purified in organic solvents are broadly water dispersible through a variety of phase (aqueous) transfer method(s).
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