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Title |
Μικροεπεξεργασία πυριτίου με laser υπερβραχέων παλμών και χαρακτηρισμός της απόκρισης διαβροχής του. |
Alternative Title |
Silicon processing via ultrashort pulsed laser and characterization of its wettability |
Author
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Καραγιαννάκη, Άννα
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Thesis advisor
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Στρατάκης, Εμμανουήλ
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Abstract |
The present thesis is based on creating micropatterned substrates of silicon by
ablation via a pulsed fs-laser. The substrates where created by altering two
parameters of the experimental setup, the first on is the fluence of the laser beam
and the second one is the environment of irradiation.
The morphological characterization of the substrates after irradiation showed that
by increasing the laser fluence there was an increase of roughness of the
micropatterned silicon substrates. The micropatterned substrates comprise ripples
and also spikes of different spatial density and height. In more detail, the increase
of the laser fluence lead in decrease of spatial density and at the same time in
increase of the height of spikes. Furthermore, the different environments of
irradiation play a significant role on the morphology of the micropatterned
surfaces. In ambient air the structures created where irregular compared to the
ones created in vacuum witch showed more order and are higher, the last ones
created in reactive gas SF6 are in higher order and also are the highest.
In time investigation of the surface wettability was held, in order to see how the
wetting properties change throughout time. The study showed that after cleaning
the surfaces they were hydrophobic, and after one weak this property changed and
they became hydrophilic and stay as such throughout the time contact angle
measurements were taken. Finally, we studied the effect of the cleaning procedure
to the wettability of the surface. We used two different cleaning methods and from
static contact angle measurements we concluded that the cleaning method plays no
significant role to the wettability properties of the microstructured surfaces.
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Language |
Greek |
Issue date |
2019-11-29 |
Collection
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School/Department--School of Sciences and Engineering--Department of Chemistry--Graduate theses
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Type of Work--Graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/2/f/f/metadata-dlib-1577786832-384318-25788.tkl
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Views |
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