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Subject: Nanocrystals × WGL Institute: DWI ×

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    Catalyst-free site-specific surface modifications of nanocrystalline diamond films via microchannel cantilever spotting
    (London : RSC Publishing, 2016) Davydova, Marina; de los Santos Pereira, Andres; Bruns, Michael; Kromka, Alexander; Ukraintsev, Egor; Hirtz, Michael; Rodriguez-Emmenegger, Cesar
    The properties of nanocrystalline diamond (NCD) films offer great potential for the creation of various sensing and photonic devices. A great challenge in order to materialize such applications lies in achieving the micrometrically resolved functionalization of NCD surfaces. In the present work, we introduce a facile approach to meet this challenge employing the novel strain-promoted alkyne–azide cycloaddition “click” chemistry reaction, a catalyst-free ligation protocol compatible with biomolecules. The ability to achieve well-resolved multicomponent patterns with high reproducibility is demonstrated, paving the way for the fabrication of novel devices based on micropatterned NCD films.
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    Reorientation mechanisms of block copolymer/CdSe quantum dot composites under application of an electric field
    (London : Royal Soc. of Chemistry, 2016) Kathrein, Christine C.; Pester, Christian; Ruppel, Markus; Jung, Maike; Zimmermann, Marc; Böker, Alexander
    Time- and temperature-resolved in situ birefringence measurements were applied to analyze the effect of nanoparticles on the electric field-induced alignment of a microphase separated solution of poly(styrene)-block-poly(isoprene) in toluene. Through the incorporation of isoprene-confined CdSe quantum dots the reorientation behavior is altered. Particle loading lowers the order–disorder transition temperature, and increases the defect density, favoring nucleation and growth as an alignment mechanism over rotation of grains. The temperature dependent alteration in the reorientation mechanism is analyzed via a combination of birefringence and synchrotron SAXS. The detailed understanding of the effect of nanoparticles on the reorientation mechanism is an important prerequisite for optimization of electric-field-induced alignment of block copolymer/nanoparticle composites where the block copolymer guides the nanoparticle self-assembly into anisotropic structures.