The nanocrystalline domains in NC-NbSe₂ film. (A, B) Large-scale and (C) zoom-in high-resolution TEM images, and (inset in (C)) Fourier transform pattern of crystalline NbSe₂ (C-NbSe₂) film grown on a sapphire substrate as comparison. (D) A large-scale TEM image showing the uniformity of as-grown NC-NbSe₂ film on SiO₂/Si substrate. (E) The EDS spectrum and (F) SAED pattern of as-grown NC-NbSe₂ film. Notably, the Cu K_α signal in panel (E) sources from the TEM grid. (G) A representative high-resolution TEM image with (H) false color and crystalline orientation superimposed to highlight nano-domain in NC-NbSe₂ film. (I) A representative grain boundary between nano-domain in NC-NbSe₂ film.