Article Structural Transformation of Polystyrene Nanosphere Produce ...
We manage to fabricate Diamond like Carbon upon over exposure of Polystyrene with laser Irradiation. Can anyone gave us the possible explanation why these carbon atoms in the polymer experience reconstruction and why they seem to move from graphite later toward diamond-like Carbon?
Welding of materials using laser is common !!!
Why alteration - I am just extending my understanding there should be more on a chemical level.
When Laser /photons of a particular energy (of particular wavelength ) is used, the energy deposition on a given region is absorbed and the energy makes transitions in the material structure . Again , the wavelength tells how deep it goes , because light has a finite depth of travelling (proportional to wavelength) that is seen as changes in the structural variations .
Welding of materials using laser is common !!!
Why alteration - I am just extending my understanding there should be more on a chemical level.
When Laser /photons of a particular energy (of particular wavelength ) is used, the energy deposition on a given region is absorbed and the energy makes transitions in the material structure . Again , the wavelength tells how deep it goes , because light has a finite depth of travelling (proportional to wavelength) that is seen as changes in the structural variations .
We found the benzene ring is much more easily affected from bombardment of photon. Why benzene ring? Is there anyone can explain this phenomena?
Bond structure Arif !!! They make a difference and give strength (Diamond vs graphite)
Yes we know about the bond structure. I am advising my PhD students to look into the bond structure. Where we have investigated it through XPS, FTIR and Raman spectroscopy. I just want to discuss, why benzene ring it the one that was much affected. It is not a direct explanation, especially the zwitter characteristic, is somehow dictate the competition between bonding and scissoring of the bonds simultaneously. Thus, it could explain partially, that once the bond either C-H, is broken, it does trigger other molecules to be excited, prolong exposure, the polystyrene molecules shifted to restructuring as graphite first, before graphene later toward Diamond-like Carbon. As I am not chemist, I wonder if ther any chemist could agree with my speculation.
SInce it is more than 10 years of researches on Polystyrene, perhaps people need to read all my research papers first before they even understand, why benzene ring could be the answers for designing amplified polymer resists. we need to understand, which part of the polymer resist molecules do affected by irradiation and the one that didn't affected can be left behind can be used for pattern transfer.
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