Finely divided nickel is one of the main heterogeneous catalysts for liquid phase hydrogenation of nitro and alkyne moieties. However, it constitutes a major safety hazard due to its pyrophoric...
In
modern laser technologies, there is a need for coatings that
would be compatible with flexible substrates while retaining the advantages
of inorganic compounds in terms of robustness. As a first step in
this direction, we developed here thin films of lanthanide oxysulfide,
of optical quality, prepared by low-temperature dip coating. As a
model compound in the family of oxysulfides, (Gd,Ce)2O2S anisotropic nanoplates were used. The films were characterized
by scanning electron microscopy (SEM), transmission electron microscopy
(TEM), X-ray diffraction (XRD), and in situ UV and
IR spectroscopic ellipsometry, showing that the band gap of the materials
was preserved through the deposition process. The thickness of the
films was tuned in a broad range, from a few nanometers to 150 nm,
using different concentrations of the colloidal suspensions as well
as single-layer and multilayer deposition. Lastly, thermal treatment
of the thin films was optimized to remove the stabilizing organic
ligands of the nanoparticles while preserving their integrity, as
confirmed by SEM and XRD.
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