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Materials-Metals 2017
Page 52
November 16-17, 2017 Paris, France
13
th
Annual Conference on
Materials Science, Metal and Manufacturing
Journal of Materials Science and Nanotechnology
Volume 1 Issue 2
Metal-nanomaterials, nanocrystallinity,
supracrystals
Marie Paule Pileni
CEA/IRAMIS, CEA Saclay, Gif-sur-Yvette, France
W
e will describe some physical and chemical properties
metal nanomaterials differing by the crystalline
structure called nanocrystallinity: It will be demonstrated that
nanocrystallinity play a major role in the final structure when
nanocrystals are subjected to oxidation processes (Kinkendall
effect). Concerning the optical properties, some processes are
markedly affected by the crystalline structure whereas others
are negligeable. Nanocrystals, characterized with low size
distribution, self assembled in 3D superlattices to produce
supracrystals. The final structure of the supracrystals depends
on the experimental conditions. By mixing nanocrystals
differing by their average diameter, binary supracrystals will
be produced. Both one component and binary supracrystals
are characterized by specific properties (optical, mechanical,
magnetic) opening several research areas. Various
water-soluble structures are produced from hydrophobic
nanocrystals. With Au supracrystals, the optical properties
revealed both photonic modes and localized surface plasmon
resonance of the nanocrystals. Furthermore, the fingerprint
of nanocrystal was preserved even for large crystalline
aggregates demonstrating that the nanocrystal could be used
as a probe for investigating the optical properties of such
assemblies. These water-soluble supracrystals pave the way
towards a large number of potential applications including
solar energy and biomedicine.
mppileni@orange.frMater Sci Nanotechnol 2017, 1:2