State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China.
Analyst. 2022 Jul 22;147(15):3585-3592. doi: 10.1039/d2an00839d.
There is an increasing need to develop simple yet effective sensors with high sensitivity, high selectivity, rapid response, and low cost for on-site detection of UO in the environment in planned or emergency situations. Herein, we develop a UO responsive interpenetrating porous photonic crystal ball (IPPCB) sensor by template replication and a two-step activation method. The amidoxime group and carboxyl group in the hydrogel drive the shrinkage of the hydrogel network through the coordination with UO, which reduces the lattice spacing, thereby changing the structure color and shifting the reflection peak position. Therefore, we can perform a semi-quantitative analysis of UO with the naked eye or a fiber spectrometer. Benefiting from the sensor's spherical symmetry and periodic interpenetrating porous structure, the sensor can provide angle-independent, fast (12 min), and sensitive (minimum detection concentration of 1 nM) detection of UO. Moreover, IPPCBs have high selectivity and excellent regeneration performance, which can be applied to real sample detection.
在有计划的或紧急情况下，为了现场检测环境中 UO，人们越来越需要开发简单而有效的传感器，这些传感器具有高灵敏度、高选择性、快速响应和低成本的特点。在此，我们通过模板复制和两步激活方法开发了一种对 UO 有响应的互穿多孔光子晶体球（IPPCB）传感器。水凝胶中的偕胺肟基团和羧基通过与 UO 的配位作用驱动水凝胶网络收缩，从而减小晶格间距，进而改变结构颜色并改变反射峰位置。因此，我们可以用肉眼或光纤光谱仪对 UO 进行半定量分析。得益于传感器的球形对称和周期性互穿多孔结构，该传感器可以提供角度无关、快速（12 分钟）和灵敏（最低检测浓度为 1 nM）的 UO 检测。此外，IPPCB 具有高选择性和优异的再生性能，可应用于实际样品检测。
