Fig. 2From: Hydrothermal Synthesis of ZnO Structures Formed by High-Aspect-Ratio Nanowires for Acetone DetectionFESEM images of the as-synthesized ZnO nanostructures. a Panoramic view. b Enlarged part of the sample. c Individual ZnO snow-like structure. d Further magnification of a single ZnO snow-like structureBack to article page