November 23, 2010 16:15 - 17:15
Empa, Dübendorf, Theodor-Erismann-Auditorium, VE102
Low-dimensional assemblies, where order and organization follow supramolecular principles, have assumed remarkable importance due to their outstanding physical (photophysical, electrical etc) and/or chemical (catalysis, molecular separation etc) properties. An easy method to produce tailored functional materials combines self-assembly and Langmuir-Blodgett assembly. In this talk It will be first illustrated how this new approach allows the deposition of graphene on a variety of substrates with a coverage that can be varied as desired from isolated sheets to a densely packed 2D arrangement. In contrast to the currently most common preparation protocols which rely on micromechanical cleavage, the yield of successful deposition of this approach is 100%, qualifying it as one of today's most trustworthy and promising methods.
It will be demonstrated how the same method allows to assemble hybrid materials based on single and/or multi-layers of clay platelets as building blocks. In this case clay nanosheets, deposited similarly to the graphene, act as 2D template for reaction or grafting of a variety of guest species (in our case: C60, Ni8 molecular magnets, Prussian Blue analogues). Perfect layer-by-layer growth and control at the molecular level allow one create entirely novel architectures whose final structure is encoded in the shape and properties of the clusters or molecules that are used. Interesting new properties emerge: for example 2 or 0D Prussian Blue analogue structures can be formed, which differently from 3D crystals, show new superparamagnetic-spin glass properties with high blocking glass temperature.
The language of the presentation is English.
Free entrance, guests are welcome
Dr. Anne Satir
Tel: 044 823 4562