| dc.description.abstract | In this study, large area vertically-aligned ZnO and Al-doped ZnO (AZO)
nanowires were successfully synthesized by hydrothermal method o glass and Si
substrates. The morphologies, crystal structures, compositions, properties, and
growth kinetics of the ZnO and AZO nanowires have been systematically investigated
by SEM, TEM, SAED, XRD, UV-vis and EDS analyses.
From TEM and XRD analyses, all the ZnO and AZO nanowires synthesized were
single crystalline with a hexagonal structure and their growth direction was parallel
to [0001]. In addition, the lengths of the ZnO and AZO nanowires were found to
increase linearly with reaction time at 65-80 0C. By measuring the growth rate at
different reaction temperatures, the activation energies for the linear growth of ZnO,
AZO (2%Al), and AZO (5%Al) nanowire arrays were derived to be about 36.6, 49.2 and
45.2 KJ/mol, respectively. The resistances of AZO film and AZO nanowires were
measured to decrease with the exposure time of UV light. On the other hand, an
abnormal surface wettability were found in the ZnO-based samples. The water
contact angles of the ZnO-based tended to increase with increasing the storage days.
In this study, we also demonstrate the wettability of AZO, and Zno nanowires can be
modulated by annealing in vacuum and in oxygen atmosphere. | en_US |