When I anneal the free standing thin film (>300 degree Celsius), wrinkles of the thin film disappear.
What is the principle of this phenomenon?
(This thin film is can be a single layer or a bilayer.)
the structure and environment (chemical makeup) probably determines the whole story, but i suspect, wrinkles can be "strained" regions of thin film, that has been relieved off their strain energy due to thermal excitations. (similar principle as crystalline grain growth or strain/deformation recovery after cold work i.e. low temperature deformation). If this is not so, then I cannot tell precisely.
the structure and environment (chemical makeup) probably determines the whole story, but i suspect, wrinkles can be "strained" regions of thin film, that has been relieved off their strain energy due to thermal excitations. (similar principle as crystalline grain growth or strain/deformation recovery after cold work i.e. low temperature deformation). If this is not so, then I cannot tell precisely.
Hello Seong,
This can happen due to polymer chain rearrangement above Tg. I mean if your thin film polymer is having the glass transition below 300 C, then there are very good chances that the polymer chains will rearrange above this temperature and the wrinkles will disappear.
Thanks,
Anita
Dear Wi Seong Ju,
I think that by recrystallizing this thin film which causes a reorganization of the structure and the improvement of physical and chemical properties such as: decrease defects, impurities disappear, increases grain size, minimizes porosity, increases density of material. All this allows the decrease surface roughness.
Best Regards
Dr. Labidi HERISSI
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