book of abstracts - IM2NP

A B S T R A C T S FRIDAY, JULY 2 N A N O S E A 2 0 1 0
12H00-12H20
Modified Langmuir-Blodgett deposition of nanoparticles for preparation of
large area ordered 2D and (2+1)D arrays.
L. Chitu1, P. Siffalovic1, E. Majkova1, M. Jergel1, S. Luby1, I. Capek2, A. Satka3,
S. V. Roth4, A. Timmann4, J. Keckes5 and G. Maier6 (1Institute of Physics, Slovak Academy
of Science, Dubravska cesta 9, 84511 Bratislava, Slovakia, 2Polymer Institute Slovak Academy of Science,
Dubravska cesta 9, 84236 Bratislava, Slovakia, 3International Laser Center and Faculty of Electrical Engineering
and Informatics SUT, 81219 Bratislava, Slovakia, 4HASYLAB /DESY, Notkestr. 86, 22603 Hamburg, Germany,
5Erich Schmid Institute for Materials Science, Austrian Academy of Sciences, Jahnstrasse 12, A-8700 Leoben
,Austria, 6Materials Center Leoben Forschung GmbH, Roseggerstraße 12, A-8700 Leoben,
Austria).fyzichil@savba.sk, Peter.Siffalovic@savba.sk, majkova@savba.sk, Matej.Jergel@savba.sk,
Stefan.Luby@savba.sk, Ignac.Capek@savba.sk, alexander.satka@stuba.sk, stephan.roth@desy.de,
jozef.keckes@mu-leoben.at, Guenther.Maier@mcl.at
1 – Introduction
The production of ordered nanoparticle arrays over macroscopic areas is of crucial importance for the
integration into commercial devices. For preparation of ordered nanoparticle monolayers, the Langmuir-
Blodgett method is often used. In this study, we present the formation of ordered 2D (monolayers) and
(2+1)D (periodic multilayer with vertically disorderd nanoparticles) nanoparticle arrays over the large areas
using a modified LB technique. For the deposition, the iron oxide nanoparticles were used [1]. The lateral
ordering and homogeneity of the arrays was studied by SEM, scanning grazing incidence small angle X-ray
scattering (GISAXS) and X-ray reflectivity techniques.
2 – Abstract
In the modified LB deposition method, developed in our laboratory, the nanoparticle monolayer is formed on
the water surface by compression and subsequently it is transferred onto the substrate by a controlled
removal of the water subphase. In this way ordered 2D arrays of iron oxide nanoparticles distributed over the
large areas (tens of cm) were prepared. Scanning GISAXS showed the formation of an ordered and uniform
nanoparticle monolayer over the large area (20 cm2) which was confirmed by X-ray reflectivity. The SEM
showed the typical “mosaic” structure of the nanoparticle monolayer [2]. The modified LB technique was
used also for preparation of the (2+1) ordered arrays (multilayers) over large areas. The distinct Bragg
reflection peaks observed in the X-ray reflectivity curves confirmed the formation of a vertically periodic
layered structure. The SEM pictures showed a similar ordering of nanoparticles in the top layer as it was
observed for the monolayer. The GISAXS analysis indicated the absence of the vertical correlation of the
nanoparticle positions in the multilayer. The results on preparation of the nanoparticle multilayers correlated
also vertically using the UV radiation during the LB deposition and thermal treatment on already deposited
samples will be presented too.
3 – Conclusion
Using the modified LB technique, the ordered 2D and (2+1)D arrays of iron oxide nanoparticles were
prepared over the large areas (tens of cm2). The SEM, XRR and scanning GISAXS proved the uniformity
and ordering of the 2D arrays. The nanoparticle multilayers showed the well defined layering, however, the
position of nanoparticles in the multilayer is not vertically correlated. The effect of UV irradiation during the
LB deposition and/or of the post deposition heat treatment on the vertical correlation is presented.
References:
1. P. Siffalovic, E. Majkova, L. Chitu, M. Jergel, S. Luby, A. Satka and S. V. Roth, Phys. Rev: B, 76 195432- A1 (2007)
2. L. Chitu, M. Jergel E. Majkova, S. Luby, I. Capek, A. Satka, J.Ivan, J. Kovac, and M. Timko, Mater. Sci. Eng., C 27, 1415, 2007
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