Large-scale and green synthesis of octahedral flower-like cupric oxide nanocrystals with enhanced photochemical properties

- A green method is reported for large-scale synthesis of CuO nanocrystals via a coordination-deposition technique.
- Flower-like nanostructure can be rationally tailored by adjusting reaction parameters.
- Flower-like nanostructure can be obtained in a wide reaction solution volume range.
- Uniform flower-like nanocrystal film assembled by oil-water interfacial self-assembly method exhibits excellent PEC performance.