嵌段聚合物模板合成CdSe纳米粒子及表征

Synthesis and Characterization of CdSe Nanoparticles Templated by Block Copolymer

以羟基化SBS(SBS-OH)为模板,N,N-二甲基甲酰胺(DMF)为溶剂,硒代硫酸钠及乙酸镉为前驱物,"原位反应"制备了CdSe纳米粒子。通过紫外-可见吸收光谱、荧光光谱(PL)和透射电子显微镜(TEM)等方法对CdSe纳米粒子的光学性质及形貌进行了表征。结果表明,利用SBS-OH的两亲性质,可以在DMF中得到具有明显量子尺寸效应的CdSe纳米粒子。随着反应时间延长和前驱物浓度增加,CdSe纳米粒子的吸收强度增加。PL光谱表明CdSe纳米粒子具有良好的光致发光特性,可以产生较为明显的带边发光。TEM结果表明3 nm^5 nm的CdSe纳米粒子可以通过SBS-OH的自组装形成30 nm^50 nm复合结构聚集体。

CdSe nanoparticles were synthesized by using hydroxylated poly（styrene-b-butadiene-b-styrene）（SBS-OH） as template,N,N-dimethylformamide（DMF） as solvent,cadmium acetate and Na2SeSO3 as precursors.The optical properties and morphologies for the synthesized CdSe nanoparticles were determined by UV-Vis absorption spectroscopy,photoluminescence spectroscopy（PL） and electron transmission microscopy（TEM） measurements.The results show that CdSe nanoparticles with apparent quantum confinement effect can be obtained by taking advantage of amphiphilic properties for SBS-OH micelles in DMF.The absorption strength of CdSe nanoparticles increases as the concentration of precursors and reaction time increase.PL results show that CdSe nanoparticles with good luminescence properties can give an apparent band-edge emission.TEM result shows that about 3 nm～5 nm single CdSe nanoparticles can form 30 nm～50 nm nanocomposites through self-assembly of SBS-OH.