Process for preparing a nanocrystalline material

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Patent Details

Publication Number
WO9710175
EP0850194
US2001005495
US6379635
DE69628565
EP1334951
Priority Date
1995-09-15
Publication Date
1997-03-20
International Patent Classification
C01B19/04

Figures

figura
Diagram of the synthetic method of nanocrystalline material (CdSe).

Abstract

A process for preparing a nanocrystalline material comprising at least a first ion and at least a second ion different from the first ion, and wherein at least the first ion is a metal ion.
The process comprises contacting a metal complex comprising the first ion and the second ion with a dispersing medium suitable to form the nanocrystalline material and wherein the dispersing medium is at a temperature to allow formation by pyrolysis of the nanocrystalline material when contacted with the metal complex.

Innovative aspects & main advantages

The invention describes a new process for preparing nanocrystalline materials comprising at least a first ion and at least a second ion different from the first ion, and wherein at least the first ion is a metal ion. The method of synthesis establishes the single-source approach, i.e. the use of coordination compounds as single-molecule precursors, as an alternative process for the preparation of high quality nanoparticles of important solids such as binary semiconductor compounds (quantum dots), by using the thermal decomposition of such precursors using a suitable solvent as the dispersing medium. ty nanoparticles of important solids such as binary semiconductor compounds (quantum dots), by using the thermal decomposition of such precursors using a suitable solvent as the dispersing medium. The nanocrystalline materials can be obtained in the form of colloidal nanoparticles or as dispersible powders in appropriate solvents.

Applications

The invention seeks to overcome problems associated with the prior art processes for making nanocrystalline materials, namely by avoiding the use of pyrophoric compounds at high temperature and not easy to handle molecular precursors. It is perceived as a scalable and general method that allows the production of a wide range of nanocrystalline materials that form the basis of a number of nanotechnological applications currently in use or with potential for further development.

Inventors

O’Brien, Paul; Trindade, Tito

Our Inventors

foto Tito Trindade

Tito Trindade

Full professor

Applicant

Imperial College of Science Technology And Medicine

Groups Involved

G1 - Porous Materials and Nanosystems

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