Synthèse et caractérisation de poly(lactide)s optiquement purs : étude cinétique et transestérification intermoléculaire

Thèse numérisée par la Direction des bibliothèques de l'Université de Montréal

Highly Cooperative Formation of Bis‐Urea Based Supramolecular Polymers

International audienceEleven bis-ureas have been synthesized, and some of their properties are reported. Several of these compounds form supramolecular polymers in organic solvents. The self-association is shown by FTIR spectroscopy to display cooperativity at two levels. The first level of cooperativity is due to the synergistic association of the two urea functions of a single molecule. The second level of cooperativity is revealed by the fact that the formation of dimers is less favored than that of long oligomers

Current driven magnetic actuation of a MEMS silicon beam in a transmission electron microscope

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Structural and Rheological Study of a Bis‐urea Based Reversible Polymer in an Apolar Solvent ^\textrm†

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Van der Waals solid phase epitaxy to grow large-area manganese-doped MoSe2 few-layers on SiO2/Si

International audienceLarge-area growth of continuous transition metal dichalcogenides (TMDCs) layers is a prerequisite to transfer their exceptional electronic and optical properties into practical devices. It still represents an open issue nowadays. Electric and magnetic doping of TMDC layers to develop basic devices such as p-n junctions or diluted magnetic semiconductors for spintronic applications are also an important field of investigation. Here, we have developed two different techniques to grow MoSe2 mono-and multi-layers on SiO2/Si substrates over large areas. First, we co-deposited Mo and Se atoms on SiO2/Si by molecular beam epitaxy in the van der Waals regime to obtain continuous MoSe2 monolayers over 1 cm(2). To grow MoSe2 multilayers, we then used the van der Waals solid phase epitaxy which consists in depositing an amorphous Se/Mo bilayer on top of a co-deposited MoSe2 monolayer which serves as a van der Waals growth template. By annealing, we obtained continuous MoSe2 multilayers over 1 cm(2). Moreover, by inserting a thin layer of Mn in the stack, we could demonstrate the incorporation of up to 10% of Mn in MoSe2 bilayers