Size Fractionation of Fluorescent Graphene Quantum Dots Using a Cross-Flow Membrane Filtration System.

ABSTRACT: Graphene quantum dots (GQDs) have received great attention as optical agents because of their low toxicity, stable photoluminescence (PL) in moderate pH solutions, and size-dependent optical properties. Although many synthetic routes have been proposed for producing GQD solutions, the broad size distribution in GQD solutions limits its use as an efficient optical agent. Here, we present a straightforward method for size fractionation of GQDs dispersed in water using a cross-flow filtration system and a track-etched membrane with cylindrical uniform nanopores. The GQD aqueous suspension, which primarily contained blue-emitting GQDs (B-GQDs) and green-emitting GQDs (G-GQDs), was introduced to the membrane in tangential flow and was fractionated with a constant permeate flow of about 800 L m<

SUBMITTER: Yim SG 

PROVIDER: S-EPMC6267503 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature