Figure 4
From: Surfactant-Assisted in situ Chemical Etching for the General Synthesis of ZnO Nanotubes Array

Schematic illustration of the chemical etching of ZnO nanorods array: a free etching; b using the surfactant of CTAB
From: Surfactant-Assisted in situ Chemical Etching for the General Synthesis of ZnO Nanotubes Array
Schematic illustration of the chemical etching of ZnO nanorods array: a free etching; b using the surfactant of CTAB