Abstract
A facile method has been developed to encapsulate Fe 3O 4 nanocrystals (NCs) in morphology-tunable fibers (belt-like, solid, and tubal) by using a sonochemistry driven synthesis and a subsequent reflux procedure. By adapting the use of tetraethyl orthosilicate, ammonia, Cd 2+, and thiolglycolic acid (TGA) to an ultrasound-driven synthesis, the Fe 3O 4 NCs were coated with a thin composite shell. Supersonic treatment plays an important role to prevent the agglomeration of the Fe 3O 4 NCs in an alkaline condition. The composite shell became thicker due to the deposition of SiO 2 monomers, Cd–TGA clusters, Cd 2+, and free TGA molecules during reflux. In addition, these composite shell-coated Fe 3O 4 NCs were assembled in composite fibers which were created by the growth of Cd–TGA clusters and the deposition of SiO 2 monomers. The Fe 3O 4 NCs mono-dispersed in fibers revealed superparamagnetic behavior. The magnetic saturation value of tubal fibers is lower than those of belt-like and solid fibers. These fibers with Fe 3O 4 NCs would be utilizable for further application. The strategy described here should give a useful enlightenment for the design and fabrication of morphology-tunable fibers with functional NCs.
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