Ph. D. THESIS 2009

a b
Figure 21 a) Optical image of gold nanowires deposited on an polyimide coated
substrate, b) SEM view of two wires of the network
Thus, the wires always remain uniform and straight before as well as after the
washing step. The regular shape aspect of the wires is another positiv point of
the polyimide glass coated surface influence, comparatively with the untreated
glass one. The preservation of wires characteristics is illustrated in Figure 21b).
4.4. The thermal effect
Ablated
polyimide
region
15
Polyimide
underlayer
Gold nanowire deposition
on polyimide layer
a b
Figure 22. AFM measurements of a typical double line: a) 3D view of a two double
lines fabricated with 60mW and 65 mW; b) detail of 3D view of the double line at 60
mW
The profile of a double line can be seen below:
Figure 23. AFM profile for the fabricated line (Cross-section)
4.5 The overcoming of the thermal effect
The nucleation and growth experiment, associated with absorption spectra in
solid state, suggested us an "optimum" of experimental conditions which can
lead to good quality lines without ablation. For our case a laser power of 15