- Monolayer Silane-Coated, Water-Soluble Quantum Dots.
Monolayer Silane-Coated, Water-Soluble Quantum Dots.
Small (Weinheim an der Bergstrasse, Germany) (2015-10-20)
Xi Zhang, Armen Shamirian, Ali M Jawaid, Christina M Tyrakowski, Leah E Page, Adita Das, Ou Chen, Adela Isovic, Asra Hassan, Preston T Snee
PMID26476710
ABSTRACT
A one-step method to produce ≈12 nm hydrodynamic diameter water-soluble CdSe/ZnS quantum dots (QDs), as well as CdS/ZnS, ZnSe/ZnMnS/ZnS, AgInS2 /ZnS, and CuInS2 /ZnS QDs, by ligand exchange with a near-monolayer of organosilane caps is reported. The method cross-links the surface-bound silane ligands such that the samples are stable on the order of months under ambient conditions. Furthermore, the samples may retain a high quantum yield (60%) over this time. Several methods to functionalize aqueous QD dispersions with proteins and fluorescent dyes have been developed with reaction yields as high as 97%.
MATERIALS
Product Number
Brand
Product Description
Sigma-Aldrich
Dichloromethane, suitable for HPLC, ≥99.9%, contains 40-150 ppm amylene as stabilizer
Sigma-Aldrich
Dichloromethane, biotech. grade, 99.9%, contains 40-150 ppm amylene as stabilizer
Sigma-Aldrich
Dichloromethane, puriss., meets analytical specification of Ph. Eur., NF, ≥99% (GC)