Department of Chemical & Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA.
Langmuir. 2011 Dec 6;27(23):13965-9. doi: 10.1021/la2021066. Epub 2011 Aug 11.
In this study, a scalable fabrication technique for controlling and maintaining the nanoscale orientation of gold nanorods (GNRs) with long-range macroscale order has been achieved through electrospinning. The volume fraction of GNRs with an average aspect ratio of 3.1 is varied from 0.006 to 0.045 in aqueous poly(ethylene oxide) solutions to generate electrospun fibers possessing different GNR concentrations and measuring 40-3000 nm in diameter. The GNRs within these fibers exhibit excellent alignment with their longitudinal axis parallel to the fiber axis n. According to microscopy analysis, the average deviant angle between the GNR axis and n increases modestly from 3.8 to 13.3° as the fiber diameter increases. Complementary electron diffraction measurements confirm preferred orientation of the {100} GNR planes. Optical absorbance spectroscopy measurements reveal that the longitudinal surface plasmon resonance bands of the aligned GNRs depend on the polarization angle and that maximum extinction occurs when the polarization is parallel to n.
在这项研究中，通过静电纺丝实现了一种可扩展的制造技术，用于控制和维持具有长程宏观有序的金纳米棒（GNRs）的纳米级取向。具有平均纵横比为 3.1 的 GNRs 的体积分数在水溶液中的聚（氧化乙烯）溶液中从 0.006 变化到 0.045，以生成具有不同 GNR 浓度的电纺纤维，直径为 40-3000nm。这些纤维中的 GNRs 表现出优异的取向，其长轴与纤维轴 n 平行。根据显微镜分析，当纤维直径增加时，GNR 轴和 n 之间的平均偏差角从 3.8 适度增加到 13.3°。互补的电子衍射测量证实了{100}GNR 平面的择优取向。光吸收光谱测量表明，取向 GNR 的纵向表面等离激元共振带取决于偏振角，当偏振与 n 平行时，最大消光发生。
