METHODS AND MATERIALS FOR CDSE NANOCRYSTAL SYNTHESIS

• Main Authors: WONG, MICHAEL, S, ALKHAWALDEH, AMMAR, S, PASQUALI, MATTEO
• Format: Patent
• Language: English; French
• Published: 27.10.2005
• Edition: 7
• Subjects: AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR; BASIC ELECTRIC ELEMENTS; CHEMISTRY; CRYSTAL GROWTH; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; METALLURGY; NANOTECHNOLOGY; PERFORMING OPERATIONS; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; REFINING BY ZONE-MELTING OF MATERIAL; SEMICONDUCTOR DEVICES; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; SINGLE-CRYSTAL-GROWTH; SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; TRANSPORTING; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL

New methods for the synthesis of nanocrystals/quantum dots are disclosed. The methods comprise use of reasonably-priced and commercially available heat transfer fluids (such as Dowtherm(R) A) as solvents to synthesize CdSe nanocrystals. Separation of nucleation and growth is achieved by quenching the reaction solution with relatively cold (room temperature) solvent to lower the solution temperature. Quenching may be followed by raising the solution temperature, to allow controlled growth to take place. L'invention concerne de nouveaux procédés pour la synthèse de nanocristaux/points quantiques. Ces procédés consistent à utiliser, comme solvants, des fluides de transfert de chaleur à prix raisonnable disponibles dans le commerce (tels que le Dowtherm(R) A) pour synthétiser des nanocristaux de CdSe. Les étapes de nucléation et de croissance sont séparées par un refroidissement de la solution de réaction au moyen d'un solvant relativement froid (température ambiante) destiné à abaisser la température de la solution. Ce refroidissement peut être suivi d'une élévation de la température de ladite solution, afin de permettre une étape de croissance contrôlée.