  Vertically aligned, beaded zinc germinate (Zn2GeO4)/ zinc oxide (ZnO) hybrid
nanowire arrays were successfully synthesized by a vapor-solid process via a
catalyst-free approach. The as-synthesized products were characterized using
X-ray diffraction, scanning electron microscopy and transmission electron
microscopy equipped with an energy-dispersive X-ray spectrometer. TEM studies
revealed the beaded microstructures of the Zn2GeO4/ZnO nanowire. Furthermore,
Zn2GeO4 nanotubes were synthesized after wet etching treatments on Zn2GeO4/ZnO
hybrid nanowires.
