Synthesis of nanoparticles
AssigneeCentrum fuer Angewandte Nanotechnologie (CAN) GmbH
InventorsStephan Haubold, Markus Haase, Karsten Riwotzki, Horst Weller, Heike Meyssamy, Fernando Ibarra
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Abstract
Methods for the preparation of inorganic nanoparticles capable of fluorescence, wherein the nanoparticles consist of a host material that comprises at least one dopant. The synthesis of the invention in organic solvents allows to gain a considerably higher yield compared to the prior art synthesis in water. All kinds of objects can advantageously be marked and reliably authenticated by using an automated method on the basis of a characteristic emission. Further, the size distribution of the prepared nanoparticles is nartower which renders a subsequent size-selected separation process superfluous.
Claims41
A method for synthesizing metal salt nanoparticles containing an anion comprising phosphates, halophosphates, arsenates, sulphates, germanates, vanadates, tantalates, tungstenates, molybdates, alkalihalogenates, or other halides,
- said method comprising:
- a) preparing a synthesis mixture, at least from
- aa) one organic component coordinating solvent controlling the crystal growth of the nanoparticles, which comprises phosphororganic compounds, monoalkylamines or dialkylamines, and a solvent for the organic component controlling the crystal growth,
- bb) a cation starting material which serves as cation source in the synthesis mixture, and
- cc) an anion starting material that serves as anion source, which comprises:
- aaa) free acids of the salts of the particular metal salt nanoparticles which are to be prepared, or
- bbb) salts, or
- ccc) organic compounds which release the anion at the synthesis temperature, and
- b) reacting the synthesis mixture until said nanoparticles have formed.
A method for synthesizing metal salt nanoparticles containing an anion comprising phosphates, halophosphates, arsenates, suiphates, germanates, vanadates, tantalates, tungstenates, molybdates, alkalihalogenates, or other halides,
- said method comprising:
- a) preparing a synthesis mixture, at least from
- aa) one coordinating organic solvent selected from phosphoric acid triesters, phosphoric amides, phosphoric amide oxide, trialkyl phosphines and trialkyl phosphine oxides,
- bb) a cation source,
- cc) an anion source, and
- b) reacting the synthesis mixture until said nanoparticles have formed.
Dependencies are inferred from the claim text.