Figure 3From: Self-Assembled 3D Flower-Like Hierarchical β-Ni(OH)2Hollow Architectures and their In Situ Thermal Conversion to NiOTEM images of the as-synthesized samples with treatment times ofa 2 h,b 6 h, andc 12 h at 120 °C. SEM images of the as-synthesized sample obtained at 120 °C for 12 h:d without urea;e andf without ammonia;g schematic illustration of the formation ofβ-Ni(OH)23D flower-like hollow architecturesBack to article page