Hydrothermal synthesis of ZnO whiskers from ɛ-Zn(OH)2 in NaOH/Na2SO4 solution

- High-aspect-ratio ZnO whiskers were hydrothermally synthesized in NaOH-Na2SO4 solutions.
- The influence of Na2SO4 on the formation of ZnO whiskers was investigated.
- Adsorption of SO42− mainly on (1 0 0) plane promoted 1D growth of ZnO whiskers along c-axis.