Keogh S M, Hedderman T G, Gregan E, Farrell G, Chambers G, Byrne H J
Facility for Optical Characterisation and Spectroscopy (FOCAS)/School of Physics, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland.
J Phys Chem B. 2004 May 20;108(20):6233-41. doi: 10.1021/jp0369387.
Interactions between arc discharge single-walled carbon nanotubes within polymer composites have been well documented. Here hybrid systems of the conjugated organic polymer poly(p-phenylene vinylene-co-2,5-dioctyloxy-m-phenylene vinylene) (PmPV) and HiPco SWNTs are explored using UV/vis/NIR and Raman spectroscopy at 514.5 and 632.8 nm to determine specific interactions. An examination of the radial breathing modes at 514.5 nm shows similar tube diameters of 1.28 and 1.35 nm selected for both the arc discharge and HiPco composites. The corresponding G lines of both composites show no specific type of tubes being selected. At 514.5 nm, the G line of the HiPco composite (1% mass fraction) shows contributions from semiconducing and metallic tubes, and the arc discharge composite (1% mass fraction) is dominated by semiconducting nanotubes. At 632.8 nm, the G line of the HiPco composite (1% mass fraction) is dominated by semiconducting tubes, and the arc discharge composite (1% mass fraction) shows strong contributions from metallic tubes. This finding is a strong indication that the selection process is dependent on tube diameter rather than backbone structure. The solubility limits of both composites are determined by investigating the G lines of both composites and have been found to be greater than 1% mass fraction by weight for the arc discharge composite and greater than 0.1% mass fraction by weight for the HiPco composite.
聚合物复合材料中电弧放电单壁碳纳米管之间的相互作用已有充分记录。在此，利用514.5和632.8 nm处的紫外/可见/近红外光谱和拉曼光谱，对共轭有机聚合物聚（对苯撑乙烯-co-2,5-二辛氧基间苯撑乙烯）（PmPV）与HiPco单壁碳纳米管的混合体系进行了研究，以确定特定的相互作用。对514.5 nm处的径向呼吸模式进行检查发现，电弧放电复合材料和HiPco复合材料均选择了直径分别为1.28和1.35 nm的类似碳纳米管。两种复合材料相应的G线均未显示出特定类型的碳纳米管被选择。在514.5 nm处，HiPco复合材料（质量分数为1%）的G线显示出半导体管和金属管的贡献，而电弧放电复合材料（质量分数为1%）则以半导体纳米管为主。在632.8 nm处，HiPco复合材料（质量分数为1%）的G线以半导体管为主，而电弧放电复合材料（质量分数为1%）则显示出金属管的强烈贡献。这一发现有力地表明，选择过程取决于碳纳米管的直径而非主链结构。通过研究两种复合材料的G线确定了它们的溶解度极限，发现电弧放电复合材料的溶解度极限按重量计大于1%质量分数，HiPco复合材料的溶解度极限按重量计大于0.1%质量分数。
