School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.
Langmuir. 2013 Jun 25;29(25):8086-92. doi: 10.1021/la400925y. Epub 2013 Jun 12.
Cadmium telluride (CdTe) tetrapods were synthesized via multiple injections of the Te precursor by utilizing bifunctional ligands. Subsequently, tetrapod-shaped semiconducting inorganic-organic nanocomposites (i.e., P3HT-CdTe tetrapod nanocomposites) were produced by directly grafting conjugated polymer ethynyl-terminated poly(3-hexylthiophene) (i.e., P3HT-≡) onto azide-functionalized CdTe tetrapods (i.e., CdTe-N3) via a catalyst-free click chemistry. The intimate contact between P3HT and CdTe tetrapod rendered the effective dispersion of CdTe tetrapods in nanocomposites and facilitated their efficient electronic interaction. The success of coupling reaction was confirmed by Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy. The grafting density of P3HT chains on the CdTe tetrapods was estimated by thermogravimetric analysis. The photophysical properties of P3HT-CdTe tetrapod nanocomposites were studied using UV-vis and photoluminescence spectroscopies. These intimate semiconducting conjugated polymer-tetrapod nanocomposites may offer a maximized interface between conjugated polymers and tetrapods for efficient charge separation and enhanced charge transport regardless of their orientation for potential application in hybrid solar cells with improved power conversion efficiency.
碲化镉（CdTe）四脚形纳米棒通过利用双功能配体多次注入碲前体制备而成。随后，通过无催化剂点击化学将末端炔基的共轭聚合物聚 3-己基噻吩（即 P3HT-≡）直接接枝到叠氮功能化的 CdTe 四脚形纳米棒（即 CdTe-N3）上，制备出四脚形半导体有机-无机纳米复合材料（即 P3HT-CdTe 四脚形纳米复合材料）。P3HT 和 CdTe 四脚形纳米棒之间的紧密接触使得 CdTe 四脚形纳米棒在纳米复合材料中有效分散，并促进它们之间的有效电子相互作用。傅里叶变换红外光谱和核磁共振波谱证实了偶联反应的成功。通过热重分析估算了 P3HT 链在 CdTe 四脚形纳米棒上的接枝密度。通过紫外-可见吸收光谱和光致发光光谱研究了 P3HT-CdTe 四脚形纳米复合材料的光物理性质。这些紧密的半导体共轭聚合物-四脚形纳米复合材料无论其取向如何，都为有效的电荷分离和增强电荷传输提供了共轭聚合物和四脚形之间的最大化界面，有望在具有提高的功率转换效率的混合太阳能电池中得到应用。
