Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory of UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, 5268 Renmin Street, Changchun, 130024, People's Republic of China.
Nanoscale. 2011 Aug;3(8):3357-63. doi: 10.1039/c1nr10405e. Epub 2011 Jul 15.
Carbon nanofibers/silver nanoparticles (CNFs/AgNPs) composite nanofibers were fabricated by two steps consisting of the preparation of the CNFs by electrospinning and the hydrothermal growth of the AgNPs on the CNFs. The as-prepared nanofibers were characterized by scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscopy, X-ray diffraction, resonant Raman spectra, thermal gravimetric and differential thermal analysis, and X-ray photoelectron spectroscopy, respectively. The results indicated that not only were AgNPs (25-50 nm) successfully grown on the CNFs but also the AgNPs were distributed without aggregation on the CNFs. Further more, by adjusting the parameters in hydrothermal processing, the content of silver supported on the CNFs could be easily controlled. The catalytic activities of the CNFs/AgNPs composite nanofibers to the reduction of 4-nitrophenol (4-NP) with NaBH(4) were tracked by UV-visible spectroscopy. It was suggested that the CNFs/AgNPs composite nanofibers exhibited high catalytic activity in the reduction of 4-NP, which might be attributed to the high surface areas of AgNPs and synergistic effect on delivery of electrons between CNFs and AgNPs. And, the catalytic efficiency was enhanced with the increasing of the content of silver on the CNFs/AgNPs composite nanofibers. Notably, the CNFs/AgNPs composite nanofibers could be easily recycled due to their one-dimensional nanostructural property.
碳纳米纤维/银纳米粒子（CNFs/AgNPs）复合纳米纤维通过两步法制备而成，包括通过静电纺丝制备 CNFs 和在 CNFs 上水热生长 AgNPs。所制备的纳米纤维分别通过扫描电子显微镜、能量色散光谱、透射电子显微镜、X 射线衍射、共振拉曼光谱、热重差热分析和 X 射线光电子能谱进行了表征。结果表明，AgNPs（25-50nm）不仅成功地生长在 CNFs 上，而且 AgNPs 在 CNFs 上分布均匀，没有聚集。此外，通过调整水热处理中的参数，可以轻松控制 CNFs 上负载的银的含量。通过紫外-可见光谱跟踪 CNFs/AgNPs 复合纳米纤维对硼氢化钠还原 4-硝基苯酚（4-NP）的催化活性。研究表明，CNFs/AgNPs 复合纳米纤维在 4-NP 的还原中表现出高催化活性，这可能归因于 AgNPs 的高比表面积和 CNFs 与 AgNPs 之间电子传递的协同效应。并且，随着 CNFs/AgNPs 复合纳米纤维上银含量的增加，催化效率得到提高。值得注意的是，由于其一维纳米结构特性，CNFs/AgNPs 复合纳米纤维可以很容易地回收。
