Fig. 3: Characterizations of the newly fabricated borophene.
From: Light-induced tumor theranostics based on chemical-exfoliated borophene
a Scanning electron microscope (SEM) image of bulk AlB2. Inset shows the black color of bulk AlB2 before etching. b Book page-like morphology after HCl etching. Inset shows the red color of etching products from AlB2. c, d Transmission electron microscope (TEM) and SEM image of the borophene nanosheets. e, f The ultrathin thickness of borophene nanosheets characterized by atomic force microscope (AFM). g Crystal lattice characterized by the high-resolution TEM. h Selected-area electron diffraction (SAED) of borophene. The blue rectangle and green triangle correspond to the β12 structure and χ3 structure, respectively
