Water-soluble fluorescent semiconductor nanocrystals

Details Water-soluble fluorescent semiconductor nanocrystals Water-soluble fluorescent semiconductor nanocrystals

G - Physics

01

N

G01N 33/58 (2006.01) G01N 33/533 (2006.01) H05B 33/10 (2006.01) H01L 33/00 (2006.01)

Patent

CA 2344479

A water-soluble semiconductor nanocrystal capable of light emission is provided. The nanocrystal including a semiconductor nanocrystal core having a selected band gap energy, a shell layer overcoating the core comprised of a semiconductor material having a band gap energy greater than that of the semiconductor nanocrystal, and an outer layer comprised of a molecule having at least one linking group for attachment of the molecule to the overcoating shell layer and at least one hydrophilic group optionally spaced apart from the linking group by a hydrophobic region sufficient to prevent electron charge transfer across the hydrophobic region.

Nanocristal semiconducteur hydrosoluble pouvant émettre de la lumière. Le nanocristal comporte un noyau de nanocristal semi-conducteur ayant une énergie de la bande interdite choisie, une couche membrane recouvrant le noyau constituée d'un matériau semi-conducteur ayant une énergie de la bande interdite supérieure à celle du nanocristal semi-conducteur, et une couche extérieure constituée d'une molécule ayant au moins un groupe de liaison permettant de fixer la molécule sur la couche membrane recouvrante et au moins un groupe hydrophile éventuellement séparé du groupe de liaison par une zone hydrophobe suffisante pour empêcher un transfert de charge d'électron à travers la zone hydrophobe.

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