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Chalcogenide nanoparticles

Chemical vapor deposition of chalcogenide materials via alternating layer Chalcogenide materials are chemical compounds consisting of at least one chalcogen ion, which is a chemical element in column VI of the periodic table also known as the oxygen family. More precisely the term chalcogenide refers to the sulphides, selenides, and tellurides.
Sol–gel chemistry represents a powerful method for assembling metal chalcogenide quantum dots into 3D connected architectures without the presence of intervening ligands to moderate particle–particle interactions. Wet gels prepared by the oxidative loss of thiolate surface groups from chalcogenide nanoparticles can be converted to xerogels (low porosity) or aerogels (high porosity), and the quantum-confinement effects in these low-dimensional networks decrease with increasing density of the network. Sol–gel chemistry to the formation of CdSe architectures and discuss how surface modification can lead to highly luminous monoliths, concluding with the prospects of these unique materials for applications in sensing and photovoltaics according to researchers of Wayne State University.
Chemical vapor deposition (CVD) process is used to prepare electrical and optical chalcogenide materials, which exhibit one or more of the properties like electrical switching, accumulation, setting, reversible multistate behavior, resetting, cognitive functionality, and reversible amorphous-crystalline transformations.
When building a multilayer structure, including at least one layer containing a chalcogen element which include the chalcogen Te along with Ge and/or Sb, deposition is done by CVD and then subjected to post-deposition application of energy to produce chalcogenide material having the above properties.
A method for forming an electrical switching material for example, comprises of the following steps:
providing a substrate;
depositing a first layer on the substrate;
depositing a second layer on the first layer to form a first structure;
applying energy to first structure;
energy transforming first structure into a second structure where second structure differs in atomic arrangement from first structure.

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