Biomedical Engineering Reference
In-Depth Information
method from an aqueous solution [151]. The tubes had a preferential
orientation along the [0001] direction and hexagon-shaped cross
sections. The novel nanostructure could be easily fabricated without
a prepared layer of seeds on the substrate. The surface condition
of substrate material and the experimental conditions played a key
role in the nanotube formation. The growth of ZnO arrays and the
deposition reaction take place by applying a cathodic potential (
-
0.7 V
vs. SCE) to the FTO substrate at 80˚C. The dissolved oxygen serves as
the oxygen source for the growth of ZnO arrays in the electrolyte. SEM
image of the result ZnO nanotubes is shown in Fig. 1.
13
.
Figure 1.13
SEM image of the ZnO nanotube film [151]. Reproduced by kind
permission from the publisher.
The electrochemically deposited single crystalline ZnO
nanowires can be applied in LEDs [147,148]. ZnO nanowire films
can be embedded in an insulating spin-coated polystyrene layer. The
spin-coating parameters are carefully fine-tuned to completely fill
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