Small 2015-12-02

Monolayer Silane-Coated, Water-Soluble Quantum Dots.

Xi Zhang, Armen Shamirian, Ali M Jawaid, Christina M Tyrakowski, Leah E Page, Adita Das, Ou Chen, Adela Isovic, Asra Hassan, Preston T Snee

Index: Small 11 , 6091-6, (2015)

Full Text: HTML

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%. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.