Fig. 1From: Photoluminescence Study of the Influence of Additive Ammonium Hydroxide in Hydrothermally Grown ZnO NanowiresSEM images of NWs grown for different concentrations of ammonia. a 0 mM, b 10 mM, c 20 mM, d 30 mM, e 40 mM, and f 50 mM. The inset in each panel (a–e) shows the top-view SEM image acquired from the same sample. The scale bar in the inset is 500 nm. g The variation of density and aspect ratio of NWs with the change in NH4OH concentrationBack to article page