Objective
The aim of this project consists in:
development of original synthesis methods of novel nanocomposite materials,
containing molybdenum disulfide and transition metal hydroxide (oxide)
layers,
microstructural characterization of these materials by means of various
methods, including probe atom Mossbauer spectroscopy. New nanocomposite materials with regularly alternated layers of MoS2 and mixed metal hydroxide, with composition [M1-xSnx(OH)y]zMoS2 (M=Fe, Co, Ni), will be synthesized using single-layer dispersions of molybdenum disulfide. These materials as well as their dehydration products, expected to contain nanoscale metal oxide fragments bounded to MoS2 layers, will be investigated by means of XRD and EXAFS techniques.
For more detailed information to be obtained about the microstructure of such materials as well as the valence state of iron and tin at the different steps of the dehydration process, both 57Fe and 119Sn Mossbauer spectroscopies will be applied. This resonance technique will also permit to characterize the evolution of the hyperfine interaction parameters and the dynamic properties of the atoms concerned. The study of magnetic hyperfine fields transferred from neighboring 3d-metal cations to the diamagnetic 119Sn probe atoms will allow, moreover, to evidence specific processes affecting cationic surrounding of tin.
The results of the investigation to be performed will be presented at the scientific conferences and published in Journals dealing with the ject concerned.
Topic(s)
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35069 Rennes
France