Figure 4. SEM micrographs of (a, b) TiO2; (c, d) N-TiO2 (e, f) ZnO and (g, h) N-ZnO nanowires [50]

From

Review of Recent Advances of ZnO Nanowires Based Sensors

Ahmed M. Nahhas

American Journal of Nanomaterials. 2020, 8(1), 18-31 doi:10.12691/ajn-8-1-3