Single Capillary Electrospinning of Magnetic Core–shell Nanofibers

Various hierarchical structures (e. g. hollow, core-shell, etc.,) have been synthesized by coaxial or multi-fluidic compound-jet electrospinning. However, the setup is complex and the parameters need to be carefully controlled. Herein, we report the creation of CoAl_0.1Fe_1.9O₄ (CAF) solid, core-shell, and hollow nanofibers via a single capillary electrospinning in combination with a controllable pre-drying process of precursor nanofibers. The formation mechanism were outlined by investigating their morphology and microstructure in response to different experimental conditions. Moreover, these CAF core-shell nanofibers were demonstrated the highest H_C as compared to their solid and hollow nanofibers due to the enhanced magnetic surface anisotropy. The present single capillary electrospinning is not only a universal and effective method, but also can be readily extended to fabricate other materials with multi-hollow structure.