Strategies for controlled assembly at the nanoscale

Datum

10.01.2012

Zeit

13:00 - 14:00

Sprecher

Prof. Federico Rosei

Zugehörigkeit

INRS-EMT, Université du Québec

Sprache

en

Hauptthema

Materialien

Andere Themen

Materialien, Physik

Host

Ulrike Steere

Beschreibung

The bottom–up approach is considered a potential alternative for low cost manufacturing of nanostructured materials [1]. It is based on the concept of self–assembly of nanostructures on a substrate, and is emerging as an alternative paradigm for traditional top down fabrication used in the semiconductor industry. We demonstrate various strategies to control nanostructure assembly (both organic and inorganic) at the nanoscale. Depending on the specific material system under investigation, we developed various approaches, which include, in particular: (i) deposition on naturally patterned substrates, which exploit long–range reconstructions that can be used to control the adsorption of organic molecules [2]; (ii) we can control the size and luminescence properties of semiconductor nanostructures, synthesized by reactive laser ablation [3]; (iii) we developed new experimental tools and comparison with simulations are presented to gain atomic scale insight into the surface processes that govern nucleation, growth and assembly [4-8]; (iv) by controlling inter-molecular interactions, we create specific nanoscale patterns including guest/host architectures [9-13]; (v) we developed a simple surface modification strategy for biomaterials which enhances biocompatibility [14-18]; (vi) we devised new strategies for synthesizing multifunctional nanoscale materials to be used for electronics, photovoltaics and catalysis [19-22]. Exploiting surface cues, surface mediated interactions, intermolecular forces and molecule–surface interactions we demonstrated the formation of long range ordered patterns in a variety of nanoscale systems, which are potentially interesting for a variety of applications in electronics, biomedicine and energy. References [1] F. Rosei, J. Phys. Cond. Matt. 16, S1373 (2004); [2] F. Cicoira, J.A. Miwa, D.F. Perepichka, F. Rosei, J. Phys. Chem. A 111, 12674 (2007); [3] D. Riabinina, C. Durand, J. Margot, M. Chaker, G.A. Botton, F. Rosei, Phys. Rev. B 74, 075334 (2006); [4] F. Ratto, A. Locatelli, S. Fontana, S. Kharrazi, S. Ashtaputre, S.K. Kulkarni, S. Heun, F. Rosei, Small 2, 401 (2006); [5] F. Ratto, A. Locatelli, S. Fontana, S. Kharrazi, S. Ashtaputre, S.K. Kulkarni, S. Heun, F. Rosei, Phys. Rev. Lett. 96, 096193 (2006); [6] F. Ratto, S. Heun, O. Moutanabbir, F. Rosei, Nanotechnology 19, 265703 (2008); [7] F. Ratto, T.W. Johnston, S. Heun, F. Rosei, Surf. Sci., 602, 249 (2008); [8] F. Ratto, F. Rosei, Mater. Sci. Eng. R 70, 243 (2010); [9] K.G. Nath et al., J. Am. Chem. Soc. 128, 4212 (2006); [10] J. MacLeod, O. Ivasenko, D.F. Perepichka, F. Rosei, Nanotechnology 18, 424031 (2007); [11] K.G. Nath et al., J. Phys. Chem. C 111, 16996 (2007); [12] O. Ivasenko et al., Chem. Comm. 10, 1192 (2009); [13] J. MacLeod et al., J. Am. Chem. Soc. 131, 16844 (2009); [14] L. Richert et al., Adv. Mater. 20, 1488 (2008); [15] S. Clair et al., J. Chem. Phys. 128, 144795 (2008); [16] F. Variola et al., Biomaterials 29, 1285–1298 (2008); [17] F. Vetrone et al., Nanoletters 9, 659 (2009); [18] L. Richert et al., Surf. Sci. 604, 1445 (2010); [19] C. Yan et al., Adv. Mater. 22, 1741 (2010); [20] C. Yan et al., J. Am. Chem. Soc. 132, 8868 (2010); [21] R. Nechache et al., Adv. Mater. 23, 1724–1729 (2011); [22] G. Chen et al., D. Ma, Chem. Commun. 47, 6308 (2011).

Letztmalig verändert: 10.01.2012, 08:35:13