憎水性单分散粒径小于10 nm复合金属量子点的制备

0引言粒径小于10nm的量子点,具有特殊的物理化学性质。如低电子转换性能、高氧化还原电位,高矫顽力,高催化性能等,金量子点还具有生物识别、生物传感器等性能[1]。纳米颗粒的合成与应用已经引起人们的广泛兴趣[2￣4],二维、三维量子点阵长程有序排布对将来的纳米电子器件及超功能性材料具有重要意义[5,6]。然而,二维、三维量子点阵长程有序排布需要单分散量子点。这就需要人们利用各种方法制备单分散量子点。直接合成法,如Lianos等[7,8],利用反胶束法合成出粒径为5nm量子点,但是单分散性不佳。目前,获得单分散纳米颗粒主要有3种方法,种子增…

Preparation of Monodispersed Hydrophobic Trimetal Quantum Dots with Particle Size Smaller than 10 nm

A new washing device was used to separate hydrophobic trimetal nanoparticles with particle size less than 10 nm monodispersed in organic solvent. The washing device and method is not only easy to control but also very efficient. Quantum dots with different sizes such as 4.5 nm, 5.1 nm, 6.4 nm were obtained. The UV-Vis spectra of those nanoparticles were at 522 nm, 529 nm, 538 nm indicating very good separation. Particularly, the absorbent peak of the particles with size of 4.5 nm is very narrow distributed.