Figure 3.

SEM images of different samples with varying magnifications. (a,b) The as-grown ZnO nanoflowers; (c,d) the nanoflowers coated by a ZnO thin film with a thickness of 15 nm by ALD; (e,f) the nanoflowers coated by the ZnO thin films with the thicknesses of 30 and 45 nm, respectively.

Ai et al. Nanoscale Research Letters 2013 8:105   doi:10.1186/1556-276X-8-105
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