We have achieved the spontaneous assembly of alumina nanoparticles on a liquid metal surface and further synthesized a very-large-scale graphene single-crystal array. The effective electrical field established as a result of the electrical charge of the alumina nanoparticles in the liquid metal ensures the ordered self-assembly of the alumina islands and lays the foundation for precise spatial control of graphene nucleation, leading to the formation of graphene single-crystal arrays. In addition, controlling the density of the alumina in the liquid metal can precisely tune the periodicity of the arrays. This simple strategy, which is unlike the usual solid/aqueous solution system, opens up new territory for nanoparticle assembly. Focusing on the origin of the nanoparticle interaction that drives the self-assembly of ordered structure in the liquid metal system is a promising avenue for triggering more interesting applications.

我们已经实现了液态金属表面上氧化铝纳米粒子的自发组装，并进一步合成了超大规模的石墨烯单晶阵列。液态金属中氧化铝纳米粒子带电所建立的有效电场可确保氧化铝岛的有序自组装，并为精确控制石墨烯成核的空间奠定基础，从而导致石墨烯单晶的形成。晶体阵列。另外，控制液态金属中氧化铝的密度可以精确地调整阵列的周期性。这种简单的策略与通常的固/水溶液系统不同，它为纳米粒子的组装开辟了新的领域。