Figure 8. (a) SEM images of hollow ZnO nanotubes obtained at (i) 500°C, (ii) 600°C and (iii) 700°C [65,66]

From

Review of Recent Advances of ZnO Nanowires Based Sensors Devices

M. Alzubaidi, Y. Saleh Ahmed M. Nahhas

American Journal of Nanomaterials. 2023, 11(1), 51-60 doi:10.12691/ajn-11-1-4