Preparation and Properties of Spinach-based Multicolor Luminescent Carbon Dots and Chiral Fluorescent Films
Multicolor emission carbon dots(CDs)have widespread application prospects in bioimaging,sensing,light-emitting diodes and catalysis.However,to date,it remains a long-standing challenge to prepare tunable-emission multi-color CDs using biomass materials as carbon sources.Herein,six types of biomass carbon dots(BCDs)with adjustable emission from 450 nm to 680 nm under a single wavelength excitation were successfully prepared using nature spinach as carbon sources via changing reaction solvents.The obtained BCDs were characterized by morphology,size,element com-position and optical properties.Among all the BCDs,the average diameters of blue,yellow,pink and red BCDs were 2.25 nm,4.15 nm,1.73 nm and 7.96 nm,respectively.These BCDs had high quantum yields(12.68%-30.77%).The fluorescence mechanism of the tunable BCDs was mainly attributed to the interaction between the carbon core's conju-gation degree and surface groups,which was analyzed by investigating the structure,composition and optical properties of CDs.Moreover,chiral films with iridescence were prepared by evaporation-induced self-assembly via dispersing blue,yellow and red BCDs into CNC solution,respectively,followed by characterizing their optical performance.This research paves the way to a new development in view of application for multicolor BCDs.
万方数据
维普
