Two-dimensional GaN nanosheets realized via hydrothermal reaction and ammoniation two-step method

Two dimensional GaN nanosheets have been synthesized based on hydrothermal reaction and ammoniation two-step method. First-step: high-quality sub-stable γ-Ga2O3 nanosheets with smooth surface and decent crystallinity have been prepared by hydrothermal reaction. Second-step: the γ-Ga2O3 nanosheets have been ammoniated to obtain the GaN nanosheets which has the hexagonal wurtzite crystal structure. Similar morphologies and lattices provide a framework for the transformation of γ-Ga2O3 to GaN under specific conditions, and the prepared GaN nanosheets maintain a layered stack structure. Raman spectroscopy test results show the A1 (LO) vibration mode is red-shifting with the thickness of the GaN nanosheets increase. The luminescence properties characterize results show the prepared GaN nanosheets exhibit strength UV–Vis's absorption peak at 357 nm, a luminescence peak at 397 nm, and the band gap is 3.12 eV. This work has proposed a two-step method to achieve a variety of nanosheets, and met the challenge to promise application in 2D GaN optoelectronic nanodevices.