RSC Advances
Paper
The sample are deposited on 24 ꢂ 24 mm2 cover glass plate
aer an alkalinisation treatment by scrubbing its surface with
a KOH solution 20% in ethanol/water. DI water is used to rinse
the surface and remove the excess of base. A 15 mL droplet of
photosensitive liquid material is deposited on to the surface of
the glass substrate. The laser focus is set in the resin at the
upper the glass surface. Line fabrication are obtained by PZT
scanning the sample with a speed of 100 micron per s, and
a laser power in the range of 1 mW (measured before the
microscope objective). The non-polymerised material is
removed by rinsing and immersing the glass substrate in
ethanol for 2 minutes.
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Conclusions
7 S.
Passinger,
M.
S.
Saifullah,
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Reinhardt,
Two-photon induced pH changes are used to control inorganic
condensation process during the sol–gel microfabrication of 2D/
3D structures of silica based materials. The role of the most
important parameters is investigated, typically the structure of the
photobase, the concentrations, the solvent. The amount of pho-
toinitiator in the sample needs to be signicant enough to induce
the inorganic polymerization. On the other hand, very high
concentrations of photocatalyst lead to non-desired condensation
out of the focal point and thus a loss in the resolution. This
extends the concept of two-photon 3D micro-fabrication oently
used on organic polymerization reactions toward the control of
inorganic polymerization and possibilities to directly fabricate
hybrid and inorganic materials. The potentiality to further easily
design microceramics using laser with submicronic resolution
open tremendous perspectives in elds such as photonic crystals,
optoelectronic devices, sensors. This work is ongoing in our
laboratory and will be the topic of next reports.
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´
13 D. Chateau, A. Liotta, H. Lunden, F. Lerouge, F. Chaput,
Conflicts of interest
D. Krein, T. Cooper, C. Lopes, M. Lindgren and S. Parola,
There are no conict to declare.
Adv. Funct. Mater., 2016, 26(33), 6005.
´
14 H. Lunden, A. Liotta, D. Chateau, F. Lerouge, F. Chaput,
¨
S. Parola, C. Brannlund, Z. Ghadyani, M. Kildemo,
Acknowledgements
M. Lindgren and C. Lopes, J. Mater. Chem. C, 2015, 3,
1026.
PULSALYS and ENS are acknowledged for funding.
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Notes and references
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2 B. H. Cumpston, S. P. Ananthavel, S. Barlow, D. L. Dyer,
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46620 | RSC Adv., 2017, 7, 46615–46620
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