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Synthèse chimique et assemblage sous champ électrique de nanocristaux semiconducteurs anisotropes

Emanuela Rossitto 1
1 LEMOH - Laboratoire d'Electronique Moléculaire Organique et Hybride
SYMMES - SYstèmes Moléculaires et nanoMatériaux pour l’Energie et la Santé : DRF/INAC/SYMMES
Abstract : This work is devoted to the synthesis and controlled assembly of semiconductor nanorod between electrodes. The alignment of nanorods on a macroscopic scale makes it possible to prepare a novel class of materials with intrinsically anisotropic optical and electric properties. To integrate nanorods in useful devices, low-cost assembly methods have to be developed. In this perspective, four sizes of rod-shaped CdSe and a new class of asymmetric core@shell system (CdSe@CdS) were prepared by chemical synthesis. Spectroscopic (UV-vis and PL) studies were performed in order to characterise the optical properties of these nanorods, while their morphology and their structure were investigated by transmission electron microscopy (TEM) and by X-ray diffraction (XRD). Then, a simple set-up was engineered to perform the assembly. The alignment was achieved by the application of an external electric field during the solvent evaporation after drop-cast deposition across lithographically pre-patterned metal electrodes (Ti/Au) on silicon oxide substrates. Experimental parameters were tested in order to evaluate their impact on the structure of the assembly. Their morphology was investigated by scanning electron microscopy (SEM) and by optical microscopy techniques. These analyses revealed a strong enhancement of NR's alignment parallel to the field lines, when an UV excitation (365 nm) is applied in addition to the electric field.
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Emanuela Rossitto. Synthèse chimique et assemblage sous champ électrique de nanocristaux semiconducteurs anisotropes. Matériaux. Université Joseph-Fourier - Grenoble I, 2009. Français. ⟨tel-00485996⟩

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