Anisotropically Alignable Magnetic Boron Nitride Platelets Decorated with Iron Oxide Nanoparticles

Abstract

To effectively utilize the anisotropic characteristics of hexagonal boron nitride (h-BN), we have developed magnetic h-BN hybrid platelets decorated with iron oxide (Fe 3 O 4 ) nanoparticles, which are used as magnetic carriers for tailoring the anisotropy of h-BN. The as-synthesized Fe 3 O 4 -coated h-BN powders can easily move under a relatively low magnetic field. With the aid of iron oxide nanoparticles, h-BN platelets randomly dispersed in an epoxy matrix are successfully reoriented in a direction vertical to the film plane. Moreover, by utilizing the anisotropic characteristics of h-BN platelets, Fe 3 O 4 -coated h-BN/ epoxy composites exhibit exceptional performance in terms of in-plane thermal conductivity. This result is attributed to an improvement in the heat-transport pathways in composite films due to the anisotropic ordering of thermally conductive h-BN sheets. The Fe 3 O 4 -decorated h-BN platelets will be promising candidates for significantly improving the performances of advanced electronic devices that require excellent thermal conductivity and electrical insulation.

Role, effect, and influences of micro and nano‐fillers on various properties of polymer matrix composites for microelectronics: A review

“…In order to induce magnetic effect on as‐synthesized h‐BN fillers, H. S. Lim et al decorated these platelets by coating iron oxide magnetite, the randomly dispersed decorated fillers in the epoxy medium, reoriented vertically on applying magnetic field. So, obtained composites with superior thermal and dielectric properties can be used as heat transport material in microelectronics, PCB, and semiconductors.…”

Transport performance in novel elastomer nanocomposites: Mechanism, design and control

“…Coating iron oxide onto the surface of BN [241,242] and graphene [243] can cause them to align in polymers under an external magnetic field. Cho et al…”

Heating Characteristics of Films Prepared with Polymer-Graphite Composites

“…As electric current is applied to the heating film, thermal energy is generated on the film surface, in which lots of contact resistances are formed between the conductive particles dispersed in the polymer matrix of the heating film. The thermal energy generated from the heating film is considerably influenced by the polymer binder, the type, and the structure of thermal conductive materials used in the film and the morphology of the as-prepared film [12][13][14][15][16].…”