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SUMMARY:Nano-Structuring Surfaces by Templated Assembly - Professor Alain 
 Jonas Université catholique de Louvain\, Belgium
DTSTART:20070316T141500Z
DTEND:20070316T151500Z
UID:TALK6098@talks.cam.ac.uk
CONTACT:Dr Kalin Dragnevski
DESCRIPTION:Hybrid nano-devices are attractive systems\, which combine the
  performance of hard-condensed materials with the versatility and flexibil
 ity afforded by soft-condensed functional materials. Instances of such sys
 tems are silicon-based nano-transistors\, with organic elements introduced
  at specific locations to bring a new function such as bio-sensing\, catal
 ysis\, chemical gating or even motion control\; or organic channel nano-tr
 ansistors wherein a polymer nano-wire serves to control charge transport b
 etween source and drain\; or hybrid storage surfaces\, where a hard patter
 ned substrate hosts a grid of stimuli-responsive molecules.\n\nThe possibi
 lity to develop such hybrid nano-devices critically rests on our ability t
 o assemble organic (macro-)molecules in nano-objects of controlled size\, 
 at specific locations on a substrate\, with preferably some degree of cont
 rol being achievable on the orientation of the molecules. Different ways c
 an be used to reach these goals\, from the relatively unsophisticated but 
 sturdy lift-off methods used in classical semi-conductor technology\, to t
 he more demanding and error-prone self-assembly methods. In this lecture\,
  we review a series of methods recently developed in our group to design n
 ano-structured functional organic surfaces\, which combine electron-beam [
 1] or nano-imprint lithography [2] with a variety of (self-)assembly proce
 sses such as crystallization [2\,3]\, (layer-by-layer) adsorption [4-6]\, 
 grafting to [7]\, grafting from\, and dewetting [8]. These different metho
 ds will be described\,  and the principles governing the tuning of the phy
 sical parameters to control assembly will be discussed. Simple systems whe
 rein chromophores or conjugated polymers provide an optical or electrical 
 function will be presented and discussed. If time permits\, first attempts
  towards controlling thermal responsivity at the nanoscale\, the topic of 
 my current sabbatical in Cambridge\, will be briefly introduced.\n\nRefere
 nces:\n\n[1] 'Binary Nano-patterned Surfaces Prepared from Silane Monolaye
 rs'\, A. Pallandre\, K. Glinel\, A. M. Jonas\, B. Nysten\, Nano Letters 20
 04\, 4\, 365.\n\n[2] 'Nanoscale Control of Polymer Crystallization by Nano
 imprint Lithography'\, Z. Hu\, G. G. Baralia\, V. Bayot\, J.-F. Gohy\, and
  A. M. Jonas\, Nano Letters 2005\, 5\, 1738.\n\n[3] 'Nano-Templated Crysta
 llization of Organic Molecules'\, J. Plain\, A. Pallandre\, B. Nysten\, A.
  M. Jonas\, Small 2006\, 2\, 892.\n\n[4] 'Tuning the Orientation of an Ant
 igen by Adsorption onto Nanostriped Templates'\, A. Pallandre\, B. De Meer
 sman\, F. Blondeau\, B. Nysten\, A. M. Jonas\, J. Am. Chem. Soc. 2005\, 12
 7\, 4320.\n\n[5] 'Alignment and Assembly of Adsorbed Collagen Molecules In
 duced by Anisotropic Chemical Nanopatterns'\, F. A. Denis\, A. Pallandre\,
  B. Nysten\, A. M. Jonas\, C. C. Dupont-Gillain\, Small 2005\, 1\, 984.\n\
 n[6] 'Nano-Confined Polyelectrolyte Multilayers'\, A. Pallandre\, A. Mouss
 a\, B. Nysten\, A. M. Jonas Adv. Mater. 2006\, 18\, 481-486.\n\n[7] 'Nano-
 Patterned Photo-Active Surfaces'\, N. Frederich\, thesis\, Université cat
 holique de Louvain\, December 2006.\n\n[8] 'Decoding Nano-Patterned Surfac
 es by Block Copolymer Dewetting'\, G. G. Baralia\, C. Filiâtre\, B. Nyste
 n\, A. M. Jonas\, submitted.\n
LOCATION:IRC in Superconductivity Seminar Room\, Cavendish Laboratory
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