Annealing temperature dependence of SEM images and < d >. (a) Low- and (b) high-magnification SEM images of the ZnO film on Ti grid at TA = 300°C. SEM images of ZnO nanocrystals after various annealing temperatures with (c) 1-D ZnO nanowires at TA = 400°C; (d) to (g) 3-D ZnO nanowires at TA = 500°C, 550°C, 600°C, and 650°C, respectively; (h) ZnO nanoflowers at TA = 700°C; (i) the growth temperature TA dependence of the mean diameter <d> obtained from a portion of an SEM image of ZnO nanowires, where the solid curve is a guide for the eye.
Shih et al. Nanoscale Research Letters 2012 7:354 doi:10.1186/1556-276X-7-354