微反应器中利用非配位有机溶剂法可控合成CdSe量子点

摘要

采用微反应器技术,在低毒性的非配位有机溶剂十八烯(ODE)/配体十八烯酸(OA)反应体系中对CdSe量子点进行了尺寸可控合成.详细探讨了制备条件对生成的CdSe量子点的粒子数及粒子尺寸的影响.结果表明,反应温度对生成的粒子数不产生显著影响,但相对较高的温度有利于具有较强荧光性的CdSe量子点生成.在固定其他反应条件下,过量的Se有利于生成大量的小粒子,当n(Cd):n(Se)=1:5时,产率可接近100％.反应物中配体的量直接影响到单体的浓度,通过控制配体OA浓度和反应时间,成功地制备了一系列显示从蓝色到红色荧光,粒径在2.2～4.3nm的CdSe量子点.%Adopting the micro-reactor technology, CdSe quantum dots were controlled synthesized in a low toxicity system of octadecene (ODE) and oleic acid (OA) as the non-coordination solvent and the ligand, respectively. The effect of reaction conditions on particle size and the particle number of prepared CdSe quantum dots were studied in detail. The results indicated that reaction temperature has little effect on the particle number, however, appropriate high temperature favored a tight size distribution with enhanced florescence intensity. Under constant conditions, excessive Se was beneficial to generate a large number of small particles. With n(Cd):n(Se) = 1:5, the yield of CdSe quantum dots is close to 100%. The ligands quantity in the reactants directly affects concentration of the monomer. By controlling the concentration of the ligand OA and reaction time, a series CdSe quantum dots are successfully prepared displaying from blue to red fluorescence with particle size of 2.2-4.3nm.