The synthesis of mono-6-thio-β-cyclodextrin capped CdTe QDs and its interaction with neutral red

This paper presents a novel method for the synthesis of CdTe quantum dots (QDs) capped with β-cyclodextrin in aqueous solution using both TGA and mono-6-thio-β-CD as stabilizers.The interaction between mono-6-thio-β-CD-CdTe QDs and neutral red (NR) was studied with fluorescence,UV-absorption and the resonance Rayleigh scattering spectrum.When its concentration was over 7.5 × 10-6 mol/L,the neutral red began to aggregate on the surface of the mono-6-thio-β-CD-CdTe QDs,which resulted in the mono-6-thio-β-CD-CdTe QDs particle size increasing,the sharply quenched fluorescence,and the marked increase of RRS intensity.

Layer-by-layer Assembled Multilayers of Graphene/Mono-(6-amino-6-deoxy)-β-cyclodextrin for Detection of Dopamine

Graphene/mono-(6-amino-6-deoxy)-β-cyclodextrin multilayer films composed of graphene sheet(GS)and mono-(6-amino-6-deoxy)-β-cyclodextrin(NH_(2)-β-CD)were fabricated easily by two steps.First,negatively charged graphene oxide(GO)and positively charged mono-(6-amino-6-deoxy)-β-cyclodextrin(NH_(2)-β-CD)were layer-by-layer(LBL)self-assembled on glassy carbon electrode(GCE)modified with a layer of poly(diallyldimethylammo-nium chloride)(PDDA).Then graphene/mono-(6-amino-6-deoxy)-β-cyclodextrin(GS/NH_(2)-β-CD)multilayer films were built up by electrochemical reduction of graphene oxide/mono-(6-amino-6-deoxy)-β-cyclodextrin(GO/NH_(2)-β-CD).Combining the high surface area of GS and the active recognition sites onβ-cyclodextrin(β-CD),the GS/NH_(2)-β-CD multilayer films show excellent electrochemical sensing performance for the detection of DA with an extraordinary broad linear range from 2.53 to 980.05μmol•L^(−1).This study offers a simple route to the controlla-ble formation of graphene-based electrochemical sensor for the detection of DA.