Nanosized silver sulfide particles: characterization, self-organization into 2D and 3D superlattices

Reverse micelles have been used to make nanosized silver sulfide particles. The size distribution is evaluated from TEM micrographs and from fluorescence spectroscopy experiments. The luminescence spectrum, measured at 2 K, shows that the distribution is narrow but contains also particles with diameters too small for detection with TEM. By coating the particles with dodecanethiol, 2D and 3D self-assemblies composed of silver sulfide nanoparticles are observed. Monolayers organized in a hexagonal network in a very large domain are observed. Furthermore, 3D layers are highly ordered and form a face-centered cubic structure

Phospholipid-protein interactions at the air-water interface: a monolayer study

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Characterization of Ordered 3D Arrays of Ag2_2S Nanocrystallites

Reverse micelles have been used to synthetize 5.6 nm silver sulfide particles. These nanoparticles are coated with dodecanethiol, extracted from reverse micelles and then dissolved in heptane. The extracting process induces a size selection with a decrease in the polydispersity from 30% to 14%. By leaving a drop of a solution on any support, or immerse the support in the solution, mono and multilayers made of nanosized particles are formed. The monolayer is arranged in a hexagonal network whereas the 3D multilayers are arranged in a face centered cubic structure. From T.E.M. (Transmission Electron Microscopy) and G.I.S.A.X.S (Grazing Incidence Small Angle X-ray Scattering) techniques morphological information is provided.
Dans cet article, la préparation et la caractérisation de réseaux ordonnés à deux et trois dimensions de nanocristallites de sulfure d'argent sont présentées. La morphologie des réseaux est étudiée à l'aide de deux techniques : la microscopie électronique à transmission et la diffusion des rayons X aux petits angles sous incidence rasante. La microscopie électronique met en évidence un empilement de nanoparticules selon une structure cubique à faces centrées. La distance moyenne entre particules et le nombre de couches formant la structure tridimensionnelle sont déterminés