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US 8,470,636 B2Granted
Aqueous process for producing crystalline copper chalcogenide nanoparticles, the nanoparticles so-produced, and inks and coated substrates incorporating the nanoparticles
AssigneeE. I. Du Pont de Nemours and Company
InventorsDaniela Rodica Radu, Lynda Kaye Johnson, Cheng-Yu Lai, Meijun Lu, Irina Malajovich
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Abstract
The present invention relates to aqueous processes to make metal chalcogenide nanoparticles that are useful precursors to copper zinc tin sulfide/selenide and copper tin sulfide/selenide. In addition, this invention provides processes for preparing crystalline particles from the metal chalcogenide nanoparticles, as well as processes for preparing inks from both the metal chalcogenide nanoparticles and the crystalline particles.
Claims10
A process comprising:
- (a) providing a first aqueous solution comprising two or more metal salts and one or more ligands;
- (b) optionally, adding a pH-modifying substance to form a second aqueous solution;
- (c) combining the first or second aqueous solution with a chalcogen source to provide a reaction mixture;
- (d) agitating and optionally heating the reaction mixture to produce metal chalcogenide nanoparticles;
- (e) optionally isolating the metal chalcogenide nanoparticles from the reaction mixture;
- and
- (f) optionally heating the isolated metal chalcogenide nanoparticles to a temperature between about 350° C. and 800° C. to provide crystalline metal chalcogenide nanoparticles.
4 more elements
Dependencies are inferred from the claim text.