15 16 High quality single crystal hematite (α-Fe 2 O 3 ) nanocubes with average dimensions of 40 nm 17 were successfully synthesized by a facile one-pot hydrothermal method. Systematic analyses 18 were performed to investigate the morphological-, structural-and optical-properties of the as-19 synthesized α-Fe 2 O 3 nanocubes. Continuous formation and hourly monitored towards proper 20 arrangement of single crystal α-Fe 2 O 3 nanocubes are observed throughout the hydrothermal 21 heating process of 180°C started from 4 h to 12 h. The probable growth mechanism on the 22 formation of cubic nanostructures is also proposed. Electron micrographs show the cubic α-23 Fe 2 O 3 synthesized at the most optimum 8 h hydrothermal heating duration are indeed 24produced in high-yield and with well-defined cubical shape. Typical rhombohedral structure 25 of cubic α-Fe 2 O 3 was evident by the XRD pattern. The SAED pattern indicates that the α-26

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