Biotech, Biomaterials and Biomedical: TechConnect Briefs 2015Biotech, Biomaterials and Biomedical TechConnect Briefs 2015

Micro, Nano & Bio Fluidics Chapter 4

Bottom-up Nanofabrication of Crystalline Structures of Magnetic Nanoparticles

X. Xue, E.P. Furlani
SUNY at Buffalo, United States

pp. 226 - 229

Keywords: magnetic field-directed self-assembly, core-shell nanoparticle structures, magnetic core-shell nanoparticles, bottom up nanofabrication, Langevin dynamics, magnetic dipole-dipole interactions

A bottom-up approach to the nanofabrication of three-dimensional (3D) crystalline structures of magnetic core-shell nanoparticles is presented. The approach is based on self-assembly and involves the use of soft-magnetic template elements to guide the assembly in the presence of a uniform bias field. The method is demonstrated using a computational model that predicts particle dynamics during assembly and the final assembled structure. The analysis demonstrates that 3D crystalline superstructures can be assembled within milliseconds and that a variety of crystalline structures can be assembled depending on the template geometry. The feature resolution of the structure can be tailored by controlling the template geometry, particle constituents, core-shell dimensions and the particle volume fraction. Moreover, the assembled structures can be transferred to a substrate to form functional thin films. This nanofabrication method is versatile and broadly applies to arbitrary template geometries and multilayered core-shell particles that have at least one magnetic component. It opens up opportunities for the scalable fabrication of nanostructured materials with unprecedented properties for a broad range of applications.