Li Rongzhen, Li Lian, Wang Bin, Yu Liping
Department of Chemistry, School of Science, Tianjin University, Tianjin 300350, China.
Department of Chemistry, School of Science, Tianjin Chengjian University, Tianjin 300384, China.
Nanomaterials (Basel). 2021 Nov 19;11(11):3126. doi: 10.3390/nano11113126.
The development of fluorescence sensing platforms with excellent photoluminescence capabilities is of great importance for their further application. In this work, a photonic crystal structure was successfully applied to enhance the luminescence performance of fluorescent hydrogel, and the application of the obtained hydrogel as a fluorescence sensor was explored. A polystyrene photonic crystal template was constructed via vertical deposition self-assembly; then, the precursor solution containing polyethylenimine-capped CdS quantum dots (PEI-CdS QDs) and monomers filled in the gap of the template. After the polymerization process, the desired hydrogel was obtained. PEI-CdS QDs endowed the hydrogel with its fluorescence property, while interestingly, the photonic crystal structure showed a significant enhancement effect on the fluorescence-emission capability. The mechanism of this phenomenon was revealed. Moreover, this hydrogel could be used as a reusable fluorescence sensor for the detection of nitrite in water with good selectivity. The limit of detection was determined to be 0.25 μmol/L, which is much lower than the maximum limit for nitrite in drinking water.
开发具有优异光致发光能力的荧光传感平台对其进一步应用具有重要意义。在这项工作中，成功应用光子晶体结构来增强荧光水凝胶的发光性能，并探索了所得水凝胶作为荧光传感器的应用。通过垂直沉积自组装构建了聚苯乙烯光子晶体模板；然后，将含有聚乙烯亚胺封端的硫化镉量子点（PEI-CdS QDs）和单体的前驱体溶液填充到模板的间隙中。经过聚合过程后，得到了所需的水凝胶。PEI-CdS QDs赋予水凝胶荧光特性，而有趣的是，光子晶体结构对荧光发射能力表现出显著的增强作用。揭示了这种现象的机制。此外，这种水凝胶可以用作可重复使用的荧光传感器，用于选择性地检测水中的亚硝酸盐。检测限确定为0.25 μmol/L，远低于饮用水中亚硝酸盐的最大限量。
