Chen Su, Zhu Jia, Shen Yongfeng, Hu Chunhui, Chen Li
College of Chemistry and Chemical Engineering and Key Laboratory of Material-Oriented Chemical Engineering of Jiang Su Province and Ministry of Education, Nanjing University of Technology, Nanjing, PR China.
Langmuir. 2007 Jan 16;23(2):850-4. doi: 10.1021/la062210g.
We reported the first synthesis of CdS nanocrystal-polymer transparent hybrids by using polyurethane (PU) grafted onto quantum dots (QDs) CdS nanocrystals. In a typical run, the appropriate amounts of cadmium chloride (CdCl2) and sodium sulfide (Na2S) in the presence of 2-mercaptoethanol (ME) as the organic ligand are well dispersed in H2O/DMF solution without any aggregation. From a combination of transmission electron microscopy (TEM) and a computing method of Brus's model according to UV-vis absorption spectra, the particle size of as-prepared hydroxyl-coated CdS nanocrystals is about 5 nm. Then, PU-CdS transparent nanocomposites hybrids were synthesized by a two-step reaction. The effect of the different ratios of ME/Cd2+ and H2O/DMF on the resulting particle size of CdS nanocrystals was investigated by UV-vis absorption measurements. FT-IR and TGA characterizations indicate the formation of robust bonding between CdS nanocrystals and the organic ligand. The fluorescence measurement shows that CdS-PU hybrids exhibit good optical properties.
我们报道了通过将接枝到量子点（QDs）硫化镉（CdS）纳米晶体上的聚氨酯（PU），首次合成了CdS纳米晶体-聚合物透明杂化材料。在典型的实验中，适量的氯化镉（CdCl₂）和硫化钠（Na₂S）在作为有机配体的2-巯基乙醇（ME）存在下，很好地分散在水/二甲基甲酰胺（H₂O/DMF）溶液中，没有任何聚集现象。根据紫外-可见吸收光谱，结合透射电子显微镜（TEM）和布吕斯模型的计算方法，所制备的羟基包覆的CdS纳米晶体的粒径约为5纳米。然后，通过两步反应合成了PU-CdS透明纳米复合材料杂化材料。通过紫外-可见吸收测量研究了ME/Cd²⁺和H₂O/DMF的不同比例对所得CdS纳米晶体粒径的影响。傅里叶变换红外光谱（FT-IR）和热重分析（TGA）表征表明CdS纳米晶体与有机配体之间形成了牢固的键合。荧光测量表明CdS-PU杂化材料具有良好的光学性能。
