Fig. 1: Bicontinuous nanostructures of SnO2:NiO/sapphire with a composition ratio of 1:1 (bicontinuous structure).
From: Bicontinuous oxide heteroepitaxy with enhanced photoconductivity
a X-ray scans in theta−2theta mode of SnO2:NiO/sapphire. b Cross-sectional TEM along the [120]sapphire zone axis. From top to bottom: surface, SnO2:NiO, and sapphire. The inset shows the SEM‒EDS elemental mapping at the same scale. The distribution of nickel and tin is combined in a layered image. c The larger scale of the cross-sectional HRTEM image along the [120]sapphire zone axis. Inset: FFT of NiO and SnO2. d In-plane phi-scan patterns of sapphire (202) reflection, NiO (110) reflection, and SnO2 (111) reflection. e Lattice projection along the epitaxial axis ([400]SnO2||[111]NiO||[001]sapphire). The orange arrows represent the in-plane orientation relationship. The projected positions of oxygen octahedra in SnO2 and NiO overlap with that of sapphire. f Plane-view HRTEM image along the [001]sapphire zone axis. The yellow dotted line displays the boundary between NiO and SnO2. Inset: FFT of NiO and SnO2.
