Using a simple and facile method, we precisely controlled the two-dimensional layered array structure of graphene oxide (GO)–iron oxide (Fe₃O₄) nanoparticle hybrid multilayer films and investigated the correlation between the assembled structure of the hybrid films and their magnetic properties. GO–Fe₃O₄ nanoparticle hybrids were obtained via the ligand exchange of oleic acid-functionalized Fe₃O₄ nanoparticles with GO at the gas–liquid interface. Hybrids of oriented Fe₃O₄ nanoparticles and GO monolayers spontaneously formed at the gas–liquid interface, which were subsequently deposited on solid substrates using the Langmuir–Schaefer (LS) technique. Two-dimensional superlattices of GO–Fe₃O₄ nanoparticle hybrids were fabricated through repeated LS deposition of the nanoparticle monolayer with a hexagonal array structure sandwiched between GO monolayers. The magnetic properties of the GO–Fe₃O₄ multilayer were measured using SQUID magnetometry. From the field cooling/zero field cooling results, we found that the 2D superlattice-like layered structure of the GO–Fe₃O₄ multilayer facilitates the layer-dependent properties in the out-of-plane field case due to the dipolar interactions between the top and bottom layers.

我们使用一种简单易行的方法，精确控制了氧化石墨烯（GO）-氧化铁（Fe ₃ O ₄）纳米颗粒杂化多层膜的二维层状阵列结构，并研究了杂化膜的组装结构与其相关性。磁性。GO–Fe ₃ O ₄纳米粒子杂化物是通过油酸官能化的Fe ₃ O ₄纳米粒子与GO在气液界面处的配体交换而获得的。定向Fe ₃ O _4的杂化物纳米颗粒和GO单层在气液界面上自发形成，随后使用Langmuir-Schaefer（LS）技术沉积在固体基质上。GO–Fe ₃ O ₄纳米杂化物的二维超晶格是通过对纳米单分子进行重复LS沉积而形成的，其中六方阵列结构夹在GO单层之间。GO–Fe ₃ O ₄多层膜的磁性能使用SQUID磁力分析仪测量。从场冷却/零场冷却的结果，我们发现GO–Fe ₃ O ₄的二维超晶格状分层结构 由于顶层和底层之间的偶极相互作用，多层在平面外场情况下促进了与层有关的特性。