book of abstracts - IM2NP

A B S T R A C T S THURSDAY, JULY 1 N A N O S E A 2 0 1 0
17H50-18H10
Nanodesign of metallic catalysts : well defined metallic nanoparticles supported
on alumina.
C. Thomazeau a, L. Bisson a,b, J. Aguilhon a,b, C. Boissière b, O. Durupthy b, C.
Sanchez b ( a IFP-Lyon, Rond-point de l'échangeur de Solaize, BP 3 - 69360 Solaize - France; b Laboratoire de
Chimie de la Matière Condensée de Paris, LCMCP, Collège de France, Bât. C-D, 11 place Marcelin Berthelot,
75231 Paris Cedex 05, France).
In the field of catalysis by metals, catalysis research efforts were until today essentially focused on
dispersion and particles size effects onto catalytic properties 1. Conventional metallic catalysts are
constituted with supported nanoparticles, which are usually represented by a truncated cuboctahedra 2. These
nanoparticles present several different active sites: (111) and (100) facets, corners and edges, each one with
different catalytic properties. Nevertheless, it has recently been established, for a set of various reactions that
both activity and selectivity are highly dependent on the morphology of nanoparticles and reactions
conditions 3. Indeed, the use of nanoparticles with particular shapes (rods, cubes, tetrahedra ...) induces a
precise control of their surface structure: type of exposed crystallographic planes, proportion between atoms
on corners, edges or facets, thus giving the possibility to tune the activity and/or the selectivity of a catalytic
system for a given reaction. This is a new insight for the nanodesign of catalysts.
The growing interest for the control of metallic nanoparticules shapes with applications in catalysis, will be
illustrated through literature examples. The IFP contribution will also be presented. More precisely, methods
of synthesis developed to obtain a set of metallic well-facetted nanoparticules (Pd, Pt, Ni) in aqueous
medium will be exposed. Then, structure-activity relationships observed for the supported catalysts obtained
by deposition of the well-facetted nanoparticules on alumina will be explained for the selective
hydrogenation reaction unsaturated hydrocarbons 4,5.
[1] J.P. Boitiaux, J. Cosyns, S. Vasudevan, Appl. Catal. 6 (1983) 41
[2] Van Hardeveld, R., Hartog, F., Surf. Sci., 15 (1969) 189
[3] Somorjai et coll., Angew. Chem. Int. Ed., 2008, 47, 9212
[4] Di Gregorio F. et coll., Appl. Catal, 352 (2009) 50
[5] Bisson L. et coll, in press
18H10-18H30 Self-assembly of gold nanoparticles on functional organic molecular crystals.
Silvia Trabattoni, Massimo Moret, Marcello Campione (University of Milano-Bicocca,
1 – Introduction
Department of Materials Science, via Cozzi 53, I-20125, Milan). silvia.trabattoni@mater.unimib.it;
marcello.campione@unimib.it.
The performance of molecular based electronic devices is mainly determined by charge carrier generation
and transport properties and by organic-metal interfacial characteristics. Indeed, charge transport mainly
occurs by carrier injection/extraction through the electrode interface, since molecular semiconductors are
hardly doped and poor of free charge. The organic-electrode interface can be obtained in different geometries
depending on the device type. In organic thin film transistors (OTFTs) the organic-metal interface is usually
obtained in top-contact geometry, i.e. the metal is deposited on the active organic substrate. Traditional
deposition techniques, such as vacuum sublimation and ionic beam deposition, can damage the surface of
organic materials; in particular the metal diffusion phenomena and the high temperatures required during
sublimation process can produce short circuits or irreparably damage the organic layer.
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