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基于静电纺丝技术制备尺寸均一、性能稳定的Ag-碳纳米管(CNTs)-TiO_2复合纳米纤维。结合了纳米银颗粒的表面等离激元共振效应,有效提高了复合材料对于可见光的吸收,此外,CNTs的掺入,可以加速电子在复合材料内部的传递,降低光生电子-空穴对的重合几率。采用扫描电子显微镜(SEM),X射线衍射(XRD)和X射线能谱仪(EDS)对复合纤维进行了表征,结果证明产物为Ag-CNTs-TiO_2复合纳米纤维,且纤维分散性好、长径比大,同时掺杂均匀,实验重复性好。相比较于TiO_2和TiO_2-Ag纳米纤维,Ag-CNTs-TiO_2纳米纤维的光电转换性能明显提高。研究了CNT掺杂量对复合材料光电转换效果的影响,结果表明:掺杂10%(wt,质量分数,下同)Ag和15%CNTs的Ag-CNTs-TiO_2复合纳米纤维光电转换效率最高。
The uniform size and stable Ag-CNTs-TiO 2 composite nanofibers were prepared by electrospinning. In combination with the surface plasmon resonance effect of nanosilver particles, the absorption of visible light by the composite material is effectively enhanced. In addition, the incorporation of CNTs can accelerate the electron transfer within the composite material and reduce the recombination of photogenerated electron-hole pairs probability. The composite fibers were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray energy dispersive spectroscopy (EDS). The results showed that the product was Ag-CNTs-TiO 2 composite nanofibers with good fiber dispersion, Large diameter ratio, while doping uniform, good experimental repeatability. Compared with TiO 2 and TiO 2 -Ag nanofibers, the photoelectric conversion properties of Ag-CNTs-TiO 2 nanofibers are obviously improved. The effects of CNT doping amount on the photoelectric conversion efficiency were investigated. The results showed that the Ag-CNTs-TiO 2 nanofibers doped with 10% (wt, mass fraction) Ag and 15% CNTs had the highest photoelectric conversion efficiency.