Fig. 1. Morphology of ZnO-Nrds on flat glass and PDMS substrates. (A) SEM image of ZnO-Nrds on PDMS indicating the upright growth of the nanorods, scale bar is 5 μm. The diameter of nanorods was ∼80–100 nm and the height was ∼1 μm. (B) AFM image of ZnO-Nrd on the glass substrate.