Fig. 3From: Improving Morphological Quality and Uniformity of Hydrothermally Grown ZnO Nanowires by Surface Activation of Catalyst LayerAFM images of sample surfaces. AFM images of the surface after 10-min activation by different cleaning solutions: a H2O2:KOH [1:2], b H2O2:KOH [1:3], c H2O2:NaOH [1:2]. Images of sample surfaces before cleaning: d uncleaned, 1-year-old gold layer; e uncleaned, 2-month-old gold layerBack to article page