Takei Hiroyuki, Okamoto Takayuki
Faculty of Life Sciences, Toyo University.
Anal Sci. 2016;32(3):287-93. doi: 10.2116/analsci.32.287.
In this paper, we evaluate randomly adsorbed cap-shaped silver nanoparticles for applications to surface-enhanced Raman spectroscopy, SERS. They were prepared by depositing silver on top of surface-adsorbed monodisperse SiO2 nanospheres, in a manner similar to the method for preparing metal film on nanosphere, MFON, but one major difference lies in the fact that nanospheres are randomly adsorbed rather than as a close-packed MFON. With random MFON, it is possible to incorporate nanospheres with more than one size. Mixing has been found to increase SERS performance. More specifically, by using 50 and 100 nm nanospheres, we found that substrates containing both types outperform substrates prepared from 100% of either 50 or 100 nm nanospheres. As evaluated by spectrophotometry, this increase could not be attributed to an increase in the extinction coefficient of the substrate at the irradiation wavelength of SERS measurements.
在本文中，我们评估了随机吸附的帽状银纳米颗粒在表面增强拉曼光谱（SERS）中的应用。它们是通过将银沉积在表面吸附的单分散SiO₂纳米球顶部制备而成的，其方式类似于在纳米球上制备金属膜（MFON）的方法，但一个主要区别在于纳米球是随机吸附的，而不是像紧密堆积的MFON那样。对于随机的MFON，可以掺入多种尺寸的纳米球。已发现混合会提高SERS性能。更具体地说，通过使用50和100nm的纳米球，我们发现包含这两种类型的基底比由100%的50nm或100nm纳米球制备的基底表现更好。通过分光光度法评估，这种增加不能归因于基底在SERS测量的照射波长处消光系数的增加。
