Recreating the Lycurgus effect from silver nanoparticles in solutions and in silica gel
Recreating the Lycurgus effect from silver nanoparticles in solutions and in silica gel
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DOI：
10.1007/s10853-014-8047-0
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发表时间：
2014-01
影响因子：
4.5
通讯作者：
J. Ueda;M. Samusawa;Keisuke Kumagai;A. Ishida;S. Tanabe
中科院分区：
文献类型：
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作者：
J. Ueda;M. Samusawa;Keisuke Kumagai;A. Ishida;S. Tanabe
使用白色光源（具体地，例如白炽灯、日光和白炽灯）通过光化学反应制备并生长Ag纳米颗粒（AgNP）溶液。在用白色光照射数天的所得AgNP溶液中观察到二向色性，也称为“Lycurgus效应”。通过用白炽灯、日光和白炽灯照射的AgNP溶液的透射光的颜色分别为橙子、红色和蓝色，而散射光的颜色在所有样品中均为绿色。基于透射光谱、反射光谱和扫描电子显微镜图像的结果，二向色性现象主要是由大的三角形棱柱和十面体AgNP的局部表面等离子体共振光散射引起的。此外，我们成功地制备了干燥的硅胶，其含有具有类似于Lycurgus杯的二向色性的AgNP。这是通过溶胶-凝胶法在阳光照射下制备的AgNP溶液的固化来制造的。
Ag nanoparticles (AgNPs) solutions were prepared and grown by photochemical reaction using white light sources, specifically such as a Xe lamp, the sunlight, and an incandescent lamp. Dichroism, also called the “Lycurgus effect”, was observed in the obtained AgNPs solutions that were irradiated with white light for several days. The color of the transmitted light through the AgNPs solutions that were irradiated with the Xe lamp, the sunlight, and the incandescent lamp were orange, red, and blue, respectively, whereas the color of scattered light was greenish in all the samples. Based on the results of the transmittance, reflectance spectra, and scanning electron microscope images, the dichroic phenomenon is mainly caused by localized surface plasmon resonance light scattering of large triangular prismatic and decahedral AgNPs. In addition, we successfully prepared a dried silica gel that contains AgNPs with a dichroic property similar to the Lycurgus cup. This was fabricated by the solidification of the AgNPs solutions that were prepared under sunlight irradiation by a sol–gel method.