State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, PR China.
Phys Chem Chem Phys. 2010 Oct 14;12(38):11843-9. doi: 10.1039/c004279j. Epub 2010 Jul 23.
In this study, we investigated the size and photoluminescence (PL) evolution of CdTe nanoparticles (NPs) in different polymer media under thermal annealing. A quick growth and maintenance of strong PL were observed. By analyzing the transmission electron microscopy (TEM) images of NPs in polymer media, we discovered that the size evolution of NPs was the combination of Ostwald ripening and dynamic coalescence throughout the growth process. Moreover, the experimental results also revealed that the nature of polymers determined the dynamic coalescence of NPs from three aspects; the mobility of polymer chains, the compatibility of NPs with polymer media, and the interaction between NPs and polymer network. Thus by altering the glass transition temperature (T(g)) of polymers, the molar mass (M(n)) of the polymers, the phase separation of NPs in polymer media, as well as the interaction between NPs and polymers, the growth rate of NPs was controllable.
在这项研究中，我们研究了在热退火条件下，CdTe 纳米粒子（NPs）在不同聚合物介质中的尺寸和光致发光（PL）演变。我们观察到 NPs 的快速生长和强 PL 的保持。通过分析 NPs 在聚合物介质中的透射电子显微镜（TEM）图像，我们发现 NPs 尺寸的演变是在整个生长过程中奥斯特瓦尔德熟化和动态聚结的结合。此外，实验结果还表明，聚合物的性质从三个方面决定了 NPs 的动态聚结：聚合物链的迁移率、NPs 与聚合物介质的相容性以及 NPs 与聚合物网络的相互作用。因此，通过改变聚合物的玻璃化转变温度（Tg）、聚合物的重均分子量（Mn）、NPs 在聚合物介质中的相分离以及 NPs 和聚合物之间的相互作用，可以控制 NPs 的生长速率。
