Microfluidic synthesis of monodispersed CdSe quantum dots nanocrystals by using mixed fatty amines as ligands

Abstract

We developed a novel microfluidic method to synthesize full-color emitting CdSe semiconductor nanocrystals with good monodispersity and less amount of Cd by using mixed amines of oleylamine (OLA) and dodecyl amine (DDA) as ligands. By the control of mixed DDA and OLA, the stage of nucleation and growth were separated, leading to narrow size distribution of CdSe semiconductor nanocrystals. The full width at half-maximum (FWHM) of fluorescence spectrum of CdSe nanocrystals could be reduced to 27.6nm as optimizing the ratio of DDA to OLA and reaction temperature. Besides, through mixed amines as ligands, CdSe semiconductor nanocrystals which emitting fluorescence ranged from 530nm to 615nm could be synthesized by using less amount of Cd. So an environmental friendly method to synthesize full-color emitting CdSe semiconductor nanocrystals would be possible.