Bandgap Tuning of β-(AlxGa1-x)2O3 Nanosheets via Liquid Metal Interface Engineering

Abstract

Precise engineering of the electronic band structure in 2D metal oxides is essential for advancing optical and electronic nanodevices, yet achieving compositional control at the nanoscale remains challenging. Here, a low-temperature liquid metal-based synthesis method is used to fabricate β-(AlxGa1-x)2O3 nanosheets with tunable composition (x = 0–0.88). This approach enables selective aluminium enrichment in nanosheets while preserving the monoclinic crystal structure and adopting the (−201) orientation, similar to conventional β-Ga2O3 thin films. The synthesized nanosheets exhibit large lateral dimensions (>100 µm) and an average thickness of 3.2 ± 0.5 nm, making them suitable for nanoscale..