Figure 4. SEM micrographs of (a, b) TiO2; (c, d) N-TiO2 (e, f) ZnO and (g, h) N-ZnO nanowires [51]

From

Review of ZnO Nano Devices

H. Murad, M. Abdulrahman, Y. Saleh, Ahmed M. Nahhas

American Journal of Nanomaterials. 2022, 10(1), 9-18 doi:10.12691/ajn-10-1-2