The NiO film was first sintered at 500 °C for 30 min and then soaked while still hot (80 °C) into a 300 μM dye solution in dry acetonitrile at room temperature for 16 h
The NiO film was first sintered at 500 °C for 30 min and thensoaked while still hot (80 °C) into a 300 μM dye solution indry acetonitrile at room temperature for 16 h