Keywords: bottom-up nanofabrication, core-shell nanoparticle structures, Langevin dynamics, magnetic core-shell nanoparticles, magnetic dipole-dipole interactions, magnetic field-directed self-assembly
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.
Journal: TechConnect Briefs
Volume: 3, Biotech, Biomaterials and Biomedical: TechConnect Briefs 2015
Published: June 14, 2015
Pages: 226 - 229
Industry sector: Sensors, MEMS, Electronics
Topic: Micro & Bio Fluidics, Lab-on-Chip