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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

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

Supelco

Dichloromethane solution, contains 10 % (v/v) methanol

Sigma-Aldrich

N,N-Dimethylformamide, suitable for HPLC, ≥99.9%

Sigma-Aldrich

N,N-Dimethylformamide, anhydrous, 99.8%

Sigma-Aldrich

N,N-Dimethylformamide, puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99.8% (GC)

Sigma-Aldrich

N,N-Dimethylformamide, ReagentPlus^®, ≥99%

Sigma-Aldrich

N,N-Dimethylformamide, ACS reagent, ≥99.8%

Sigma-Aldrich

N,N-Dimethylformamide, JIS special grade, ≥99.5%

Sigma-Aldrich

N,N-Dimethylformamide, SAJ first grade, ≥99.0%

Sigma-Aldrich

Cesium carbonate, 99.9% trace metals basis

Sigma-Aldrich

Cesium carbonate, 99.995% trace metals basis

Sigma-Aldrich

N,N-Dimethylformamide, biotech. grade, ≥99.9%

Sigma-Aldrich

N,N-Dimethylformamide, for molecular biology, ≥99%

Sigma-Aldrich

N,N-Dimethylformamide, ACS reagent, ≥99.8%

Supelco

Dichloromethane solution, certified reference material, 5000 μg/mL in methanol

Sigma-Aldrich

Cesium carbonate, 99.95% trace metals basis

Supelco

Dichloromethane, ≥99.9%

Sigma-Aldrich

Dichloromethane, suitable for HPLC, ≥99.9%, contains 40-150 ppm amylene as stabilizer

Sigma-Aldrich

Dichloromethane, anhydrous, ≥99.8%, contains 40-150 ppm amylene as stabilizer

Sigma-Aldrich

Dichloromethane, puriss., meets analytical specification of Ph. Eur., NF, ≥99% (GC)

Sigma-Aldrich

Dichloromethane, biotech. grade, 99.9%, contains 40-150 ppm amylene as stabilizer

Sigma-Aldrich

Dichloromethane, contains 40-150 ppm amylene as stabilizer, ACS reagent, ≥99.5%