Figure 6From: Facile synthesis of hollow Cu2O octahedral and spherical nanocrystals and their morphology-dependent photocatalytic propertiesSEM images of Cu 2 O samples obtained at different temperatures. (a) 30°C (SI1-D1 in Additional file1), (b) 60°C (SI1-D2 in Additional file1), and (c) 90°C (SI1-D3 in Additional file1).Back to article page