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@PHDTHESIS{Gorzolnik:50081,
author = {Gorzolnik, Blazej},
othercontributors = {Möller, Martin},
title = {{A}mphiphilic block copolymers as templates for particle
formation and positioning},
address = {Aachen},
publisher = {Publikationsserver der RWTH Aachen University},
reportid = {RWTH-CONV-112642},
pages = {180 S. : Ill., graph. Darst.},
year = {2008},
note = {Aachen, Techn. Hochsch., Diss., 2008},
abstract = {In this thesis, amphiphilic block copolymers were
successfully applied as templates for the controlled
formation and defined positioning of metal and metal oxide
nanoparticles arranged in periodic and artificial patterns
on flat surfaces as well as in polymer nanofibre structures.
Three different types of amphiphilic block copolymers,
polystyrene-b-poly(2-vinylpyridine),
polyisoprene-b-poly(2-vinylpyridine) and
poly(butadiene)-b-poly(ethylene oxide), were synthesized by
living anionic polymerisation and subsequently employed in
the formation of reverse micelles in selective solvents.
Polymer micelles were used as nanoreactors, which were
loaded by Au or TiO2 precursors and deposited in controlled
fashion by a dip-coating technique onto SiO2 substrates to
form a hexagonally ordered monomicellar film. Exposure to a
plasma process reduced precursor to corresponding metal and
removed polymer completely leaving behind nanoparticles
attached to the substrate in the same order of the micelles.
Influence of the selective solvent and the dipping angle on
the long-range order of the micelles was studied. Micellar
monolayers were characterized by Scanning Force Microscopy
and the regularity of the lattice was quantified as the
number of dislocations present for a given number of
micelles. It was shown that micelles self-organize in a
lattice with fewer defects (up to $40\%)$ when a higher
boiling solvent is used as selective solvent. The dipping
angle had no considerable effect on the long-range order,
however it proved to be of crucial importance for the tuning
of the micellar separation distance (from 95 to 160 nm for
long and from 40 to 60 nm for the short corona micelles). A
method was developed to arrange micelles and subsequently
nanoparticles in nano-structured micropatterns on flat
substrates using the combinations of “top-down” and
“bottom-up” approaches: a self-assembled monolayer of
hexagonally ordered block copolymer micelles loaded with a
gold precursor salt was used as a resist for lithography.
Two different energy sources were applied to selectively
modify and pin the micelles to the substrate: UV light and a
Focus Ion Beam. Solvent development of the monolayer after
selective exposure resulted in the removal of the unmodified
polymer only. Furthermore the self-assembly of the
“crew-cut” micelles into cylindrical structures was
investigated and the relation between system parameters
(ratio between constituent blocks, molecular weight of block
copolymers, used selective solvent) and the resulting
micellar morphologies discussed. Nanofibres were
successfully electrospun from spherical and cylindrical
PS-b-P2VP micellar solutions loaded with gold precursor
salt. Reduction of the salt by addition of anhydrous
hydrazine in the micellar solution prior to the spinning
process, resulted in homogeneously distributed,
monodispersed Au nanoparticles in the electrospun
nanofibers.},
keywords = {Anionische Polymerisation (SWD) / Nanostruktur (SWD) /
Strukturierung (SWD) / Photolithographie (SWD) / Micelle
(SWD) / Metallcluster (SWD) / Gold (SWD)},
cin = {154720 / 150000},
ddc = {540},
cid = {$I:(DE-82)154720_20140620$ / $I:(DE-82)150000_20140620$},
typ = {PUB:(DE-HGF)11},
urn = {urn:nbn:de:hbz:82-opus-23269},
url = {https://publications.rwth-aachen.de/record/50081},
}
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