Low-Cost Preparation of Wafer-Scale Au(111) Single Crystals for the Epitaxy of Two-Dimensional Layered Materials

JY Hu and JL Wang and PF Yang and WZ Quan and X Wang and HX Ding and JT Fu and Y Peng and RH Zhang and HG Wang and LM Xie and K He and LL Wang and W Wei and LN Zhang and ZF Liu and YF Zhang, ACS NANO, 19, 4973-4982 (2025).

DOI: 10.1021/acsnano.4c17431

Single-crystal Au(111), renowned for its chemically inert surface, long- range "herringbone" reconstruction, and high electrical conductivity, has long served as an exemplary template in diverse fields, e.g., crystal epitaxy, electronics, and electrocatalysis. However, commercial Au(111) products are high-priced and limited to centimeter sizes, largely restricting their broad applications. Herein, a low-cost, high- reproducible method is developed to produce 4 in. Au(111) single crystals from commercial Au foils, via an abnormal grain growth process. This methodology involves the initial preparation of a (100)-textured Au polycrystalline foil, followed by the evolution and continuous expansion of an Au(111) abnormal grain through one-site stress loading and stress- relief annealing in an Ar/H2 atmosphere. Theoretical simulations indicate that stress/strain and high-temperature treatments in the H2 atmosphere induce an intermediate disordered state, facilitating the evolution from polycrystalline Au(100) foil to single-crystal Au(111) foil. Furthermore, the resulting Au(111) foils have been utilized as model substrates for the oriented growth of two-dimensional transition metal dichalcogenides and their heterostructures with graphene. This work hereby puts forward an effective approach for large-scale, cost- effective production of metal single crystals, potentially revolutionizing their applications across various fields, from materials sciences to electronics and catalysis.

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