Hierarchically structured photonic crystals for integrated chemical separation and colorimetric detection
Hierarchically structured photonic crystals for integrated chemical separation and colorimetric detection
复制标题
用于集成化学分离和比色检测的分层结构光子晶体
DOI：
10.1039/c6nr08767a
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发表时间：
2017
期刊：
影响因子：
6.7
通讯作者：
Ge Jianping
中科院分区：
文献类型：
--
作者：
Fu Qianqian;Zhu Biting;Ge Jianping
制备了一种具有分级多孔结构的SiO2胶体光子晶体薄膜，首次实现了化学物种的集成分离和比色检测。与传统的薄层色谱相比，这种基于光子晶体的薄层色谱新方法不需要染色、显影和紫外照射。介孔SiO2粒子通过过饱和诱导沉淀过程组装形成具有微米级裂纹和介孔的均匀和分级的光子晶体，这加速了显色剂的扩散，并增强了分析物与二氧化硅之间的吸附/脱附，以实现高效分离。同时，渗透到光子晶体空隙中的化学物质使折射率增大，结构色向未加载部分的对比度大，分离前后的样品斑点可以用肉眼直接识别。
A SiO2 colloidal photonic crystal film with a hierarchical porous structure is fabricated to demonstrate an integrated separation and colorimetric detection of chemical species for the first time. This new photonic crystal based thin layer chromatography process requires no dyeing, developing and UV irradiation compared to the traditional TLC. The assembling of mesoporous SiO2 particles via a supersaturation-induced-precipitation process forms uniform and hierarchical photonic crystals with micron-scale cracks and mesopores, which accelerate the diffusion of developers and intensify the adsorption/desorption between the analytes and silica for efficient separation. Meanwhile, the chemical substances infiltrated to the voids of photonic crystals cause an increase of the refractive index and a large contrast of structural colors towards the unloaded part, so that the sample spots can be directly recognized with the naked eye before and after separation.