book of abstracts - IM2NP

A B S T R A C T S MONDAY, JUNE 28 N A N O S E A 2 0 1 0
exceptional self-assembly process possesses interesting properties. As for now, their unique properties
contain high stability to heat and solvents, high rigidity and supercapacitance properties.
In our studies we report for the first time in the bio-organic world on the direct observation of quantum
confined nanocrystalline structure at various peptide nanostructures. These highly ordered building blocks of
the structures have been observed from optical studies where pronounced quantum confinement (QC) and
photoluminescence (PL), which results in an intense blue emission, have been revealed. We found a step-like
optical absorption behavior, which is a distinguished feature of 2D-QC, and a spike-like behavior, which is a
feature of 0D-QC. By calculations we have estimated the dimension of those crystalline regions to be at the
order of only ~1 nm, a size that is most difficult to achieve at the inorganic world using common deposition
techniques. These data directly indicates on the presence of fine crystalline structure at the PNT and allows
relating these PNT to self-assembly ceramic-like nanostructural bio-inspired material. By following the
formation of the exciton we could follow the self-assembly process of the structures. Our new findings of
blue emission from the PNT may result in a peptide-based luminescence device, such as light emitting diode
(LED) or laser.
The studied peptide nanostructures were being inspired by motifs from amyloid proteins. This inspiration
promoted us to explore also the self-assembly process of amyloid proteins. We have found that the selfassembly
process of amyloid fibrils is also characterized with the formation of nano crystalline regions and
exhibit the formation of an exciton and QC structures.
18H30-18H50
Creating biofibre-noble metal nanocomposites - an in situ sputter deposition
investigation.
Stephan V. Roth1,*, Volker Körstgens2, Kai Schlage1, Sebastien Couet1,3, Ezzeldin
Metwalli2, Ralf Röhlsberger1, Rainer Gehrke1, Peter Müller-Buschbaum2
(1HASYLAB-DESY, Notkestr. 85, D-22607 Hamburg, Germany; 2TU-Muenchen, Physik-Department Lehrstuhl
E13, Garching, Germany; 3K.U. Leuven, Afdeling Kern- en Stralingsfysica, 3001 Heverlee,
Belgium)*stephan.roth@desy.de
1 – Introduction
Polymer-metal nanocomposites are used in many areas of sensor techniques, information technology and
biotechnology [1]. The creation of nanocomposites using self-assembly during solution casting and sputter
deposition are one of the most widely used methods [2,3]. Todays reduction of structural sizes for many
sensor-type and information devices based on nanocomposite materials creates a need for investigating the
nanocomposite's structure in such a restricted geometry [1]. Typically, these devices display a flat geometry.
However, using aligned cylindrical, wire- or stripe-like arrays of nanoparticles enables to install plasmon
waveguide devices which allow for guiding electromagnetic energy below the diffraction limit of light [3].
2 – Abstract
We explore in-situ the self-assembly of metal nanoparticles on curved, flexible biopolymeric fibers using
grazing incidence small angle x-ray scattering (GISAXS) in combination with in-situ sputter deposition,
following the same route used to coat flat nanostructured polymer blends [4]. This fiber-metal
nanocomposite acts as a model system for many industrial applications, like anti-counterfeiting and cosmetic
products, as well.
27