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7th Scientific Meeting

One more edition of the Chapter's Scientific Meeting will take place on December 6th, this time we have Dr Oliver Soppera, from the Institute of Materials Science Mulhouse (CNRS, France) with a talk about Direct laser writing.
When Dec 06, 2013
from 02:00 to 03:30
Where Room 007 Mathematics Department FCUP
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Talk title: "Laser direct write of metal oxide micro-nano-structures

Abstract: A versatile, fast and easy route towards metal-oxide nanostructures prepared by full-optical method, at room temperature is presented here. The concept relies on the preparation of photosensitive metal-oxo clusters (MOC) that can be crosslinked and mineralized in a single step process, by Deep-UV (DUV) irradiation (ArF laser emission band at 193 nm). The oxo-clusters are prepared by complexation between metal alkoxides and methacrylic acids followed by a partial hydrolysis. These molecular building blocks are designed to absorb DUV light and they can react from excited stated to give rise to crosslinking reactions. Photocrosslinking of Ti, Zr and Hf oxo-clusters was investigated by means of in situ FTIR and spectroscopic ellipsometry. In the case of Ti-oxo clusters, we demonstrate that the material can be fully mineralized into TiO2 by DUV irradiation. A photocatalytic process involving TiO2 nanoparticles is proposed to explain the DUV mineralization process. Finally, we used DUV interferometric lithography to illustrate nanopatterning based on these photoresists. These inorganic photoresists open new doors towards room temperature preparation of high-resolution inorganic nanostructures with strong interest for practical applications in electronics, optics, photonics or biology.

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