Aki Shoma, Sueyoshi Kenji, Hisamoto Hideaki, Endo Tatsuro
Department of Applied Chemistry, Osaka Prefecture University.
PRESTO, Japan Science and Technology Agency.
Anal Sci. 2017;33(11):1247-1251. doi: 10.2116/analsci.33.1247.
We investigated the origin of the optical responses of a two-dimensional photonic crystal (2D-PhC) optode membrane ion sensor based on plasticized poly(vinyl chloride) (PVC) containing lipophilic dye. We previously developed a highly sensitive potassium ion sensor. However, the contributions of various factors to the sensor's optical response could not be distinguished. Here, we synthesized a lipophilic dye with spectral changes that do not overlap with those of propagated light in the PhC. Using this synthesized dye excluded the contribution of light absorption by the dye to the peak intensity change of the ion sensor. In refractive index standard solutions, the bulk refractive index change upon ion extraction contributed negligibly. The contribution of diffracted light scattering by optical transparency change of the plasticized PVC upon ion extraction accounted for approximately 45% of the ion sensor's total response. These findings are important for the development of highly sensitive plasticized PVC-based 2D-PhC ion sensors.
我们研究了基于含有亲脂性染料的增塑聚氯乙烯（PVC）的二维光子晶体（2D-PhC）光电极膜离子传感器的光学响应起源。我们之前开发了一种高灵敏度钾离子传感器。然而，无法区分各种因素对传感器光学响应的贡献。在这里，我们合成了一种光谱变化与光子晶体中传播光的光谱变化不重叠的亲脂性染料。使用这种合成染料排除了染料光吸收对离子传感器峰值强度变化的贡献。在折射率标准溶液中，离子萃取时本体折射率的变化可忽略不计。离子萃取时增塑PVC光学透明度变化引起的衍射光散射贡献约占离子传感器总响应的45%。这些发现对于开发基于增塑PVC的高灵敏度2D-PhC离子传感器很重要。
