Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, India.
J Phys Chem B. 2011 Feb 10;115(5):919-24. doi: 10.1021/jp109900m. Epub 2011 Jan 11.
Poly(3-hexylthiophene) (P3HT) degrades in organic solvents containing dissolved molecular oxygen when irradiated with ultraviolet light. Hence, it is important to develop strategies that can enhance the photostability of P3HT and enhance the device performance. In this work, we report that preparing composites of P3HT with appropriate amounts of multiwalled carbon nanotube (MWCNT) results in superior photostability of P3HT. UV-visible and fluorescence spectroscopy have been used as primary tools to study the photostability of P3HT and its composites. Scanning electron microscopy (SEM) images of the composites display dispersed CNTs being well coated by P3HT. Transmission electron microscopy (TEM) micrographs along with SAED patterns reveal that P3HT coats the CNTs, which is the reason for superior dispersion of the composite. ESR spectroscopy was also performed to pursue and follow the degradation of P3HT. Ten weight percent of MWCNTs in P3HT was found to be the optimum loading amount that results in maximum photostability of the P3HT as compared to the other ratios. This enhanced photostability of P3HT on preparing composites with MWCNT in addition to its easy processability directly from solution makes these composites immensely important for optoelectronic applications.
聚（3-己基噻吩）（P3HT）在含有溶解分子氧的有机溶剂中，在紫外光照射下会降解。因此，开发能够提高 P3HT 光稳定性并提高器件性能的策略非常重要。在这项工作中，我们报告称，将 P3HT 与适量的多壁碳纳米管（MWCNT）制备成复合材料可显著提高 P3HT 的光稳定性。我们使用紫外-可见和荧光光谱作为主要工具来研究 P3HT 及其复合材料的光稳定性。复合材料的扫描电子显微镜（SEM）图像显示分散的 CNT 被 P3HT 很好地包覆。透射电子显微镜（TEM）图谱和选区电子衍射（SAED）图谱表明 P3HT 包覆了 CNT，这是复合材料具有优异分散性的原因。我们还进行了电子顺磁共振（ESR）光谱研究，以跟踪和追踪 P3HT 的降解过程。结果发现，在 P3HT 中添加 10wt%的 MWCNT 是最佳的负载量，与其他比例相比，可使 P3HT 的光稳定性达到最大。与其他比例相比，在 P3HT 中添加 MWCNT 制备复合材料可显著提高 P3HT 的光稳定性，此外，复合材料还具有易于溶液加工的特点，这使得它们在光电子应用中具有重要意义。
