The BioRobotics Institute, Scuola Superiore Sant'Anna, Viale Rinaldo Piaggio 34, Pontedera (PI) 56025, Italy.
Center for Micro-BioRobotics @SSSA, Istituto Italiano di Tecnologia , Viale Rinaldo Piaggio 34, Pontedera (PI) 56025, Italy.
ACS Appl Mater Interfaces. 2017 Feb 8;9(5):4818-4827. doi: 10.1021/acsami.6b14455. Epub 2017 Jan 27.
Stimuli-responsive photonic crystals (PCs) represent an intriguing class of smart materials very promising for sensing applications. Here, selective ionic strength responsive polymeric PCs are reported. They are easily fabricated by partial sulfonation of polystyrene opals, without using toxic or expensive monomers and etching steps. The color of the resulting hydrogel-like ordered structures can be continuously shifted over the entire visible range (405-760 nm) by changing the content of ions over an extremely wide range of concentration (from about 70 μM to 4 M). The optical response is completely independent from pH and temperature, and the initial color can be fully recovered by washing the sulfonated opals with pure water. These new smart photonic materials could find important applications as ionic strength sensors for environmental monitoring as well as for healthcare screening.
刺激响应型光子晶体（PCs）是一类非常有前途的智能材料，可用于传感应用。本文报道了具有选择性离子强度响应的聚合物 PCs。它们是通过对聚苯乙烯opal 进行部分磺化来制备的，无需使用有毒或昂贵的单体和刻蚀步骤。所得水凝胶状有序结构的颜色可以通过在极宽的浓度范围内（从约 70 μM 到 4 M）改变离子的含量而在整个可见范围内（405-760nm）连续移动。光学响应完全独立于 pH 值和温度，并且初始颜色可以通过用纯水洗涤磺化 opal 完全恢复。这些新型智能光子材料可作为用于环境监测以及医疗保健筛查的离子强度传感器而具有重要的应用。
