Typical SEM images of ZnO nanoneedle arrays and ZnO/CdSe core/shell nanostructures. (a) SEM image (40° tilted) of a ZnO nanoneedle array grown on SnO2:F substrate by solution method. The average length of the nanoneedle is about 4 to 5 μm. The diameter to the tip is 10 nm, and the diameter to the base is 200 nm. (b) SEM image (40° tilted) of a ZnO/CdSe core/shell nanoneedle array coated by electrodeposition. Inset: HRTEM image of a CdSe grain.
Chen et al. Nanoscale Research Letters 2012 7:516 doi:10.1186/1556-276X-7-516