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May 16-17, 2019 | Prague, Czech Republic
2
nd
International Conference on
22
nd
International Conference on
Nanomaterials and Nanotechnology
Advanced Nanoscience and Nanotechnology
Joint Event
&
Journal of Materials Science and Nanotechnology | Volume 3
Mater Sci Nanotechnol, Volume 3
Photo-thermal directed assembly
Hagay Shpaisman, Ehud Greenberg
and
Nina Armon
Bar-Ilan University, Israel
M
icro-patterning of various materials was recently
developed based on the laser-induced microbubble
technique (LIMBT). LIMBT relies on the formation of
a microbubble due to laser heating of a dispersion of
nanoparticles (NPs) that absorb the laser light. Natural and
Marangoni convection currents carry the NPs to the bubble/
substrate interface where some of them are pinned. Moving
the substrate relative to the laser beam results in deposition
of NPs along a predetermined path. Unfortunately, for many
materials this deposition is non-continuous. We have recently
found that controlling the construction and destruction of
the microbubble through modulation of the laser enables
the formation of continuous patterns by preventing the
microbubble from getting pinned to the deposited material.
Furthermore, we show that microstructure formation from
an ion solution could be explained by a similar mechanism.
Photo-thermalreductionoftheionsolutionleadstoformation
of NPs. These NPs are then pinned to the bubble/substrate
interface. This innovative approach can be applicable for
producing thin conductive patterns and allow fabrication of
microelectronic devices and sensors.
Illustration of deposition processes for different laser focus positions:(A) at the interface between the
solutiondropletandair,(B) inside thesolutionand (C)at thesubstrate/solution interface.The inset ineach
figureshowsthedeposits (bright-fieldmicroscopy image forA,CandTEM forB)
Speaker Biography
Hagay Shpaisman is currently working as a principal investigator in Bar-Ilan
University, Israel. In 2013, he serves as a senior lecturer (eq. to assistant
professor) at Department of Chemistry & Institute for Nanotechnology
and Advanced Materials (BINA), Bar-Ilan University, Israel. Between
2010 – 2013, post-doctoral fellow with Prof. David Grier at NYU, USA and
obtained his PhD under the supervision of Prof. David Cahen during 2010
from the Weizmann Institute of Science, Israel. They are fascinated by
scientific questions that are at the interface between chemistry, physics
and material science. They develop novel methods for bottom-up directed
assembly by utilizing optical and acoustic fields. These fields dictate the
spatial distribution of materials, their mesoscopic structure and could
allow formation of new hybrid materials. A key feature of this approach
is its modularity, as it could be implemented on various material systems.
Due to the flexibility in material choice, this innovative approach will open
the door to new ways to act upon materials, with envisioned applications
for electronics, photonics and drug delivery systems.
e:
hagay.shpaisman@biu.ac.il