Li Taotao, Li Xinyi, Zheng Yu, Zhu Pan, Zhang Cheng, Zhang Kui, Xu Jing-Juan
School of Chemistry and Chemical Engineering, Anhui Province Key Laboratory of Coal Clean Conversion and High Valued Utilization, Anhui University of Technology, Maanshan, Anhui243032, China.
State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu210023, China.
Anal Chem. 2023 Jan 31;95(4):2445-2451. doi: 10.1021/acs.analchem.2c04639. Epub 2023 Jan 18.
Employing long-lived luminescent materials to design a chemical sensing platform can eliminate real-time excitation and background fluorescence. However, the realization of long-lived emissions in aqueous media was limited to transition-metal complexes, doped quantum dots, organic crystals, and inorganic persistent phosphors, which suffer from the drawbacks of large size, expensive elements, and poor dispersibility. In this work, phosphorescent carbon dots (CDs) were covalently immobilized in a silica matrix (CDs@SiO) to achieve afterglow emission in an aqueous dispersion. CDs@SiO with long lifetime (∼1.6 s) was utilized as an energy donor to fabricate nonradiative energy transfer systems with various organic dyes through the surface micelle self-assembly method. Benefiting from the high energy transfer efficiency between CDs@SiO and organic dyes, multicolor afterglow emissions were successfully obtained in aqueous media. As a proof of concept, a ratiometric phosphorescent probe using CDs@SiO as a donor and Hg-responsive rhodamine derivative as an acceptor was designed. Hg triggered the energy transfer process between the donor-acceptor pair, leading to the sensitive detection of Hg ions. The work presented here provides opportunities to develop chemical sensors with low background interferences and easily recognizable signals.
采用长寿命发光材料设计化学传感平台可以消除实时激发和背景荧光。然而，在水性介质中实现长寿命发射仅限于过渡金属配合物、掺杂量子点、有机晶体和无机持久磷光体，它们存在尺寸大、元素昂贵和分散性差等缺点。在这项工作中，磷光碳点（CDs）被共价固定在二氧化硅基质（CDs@SiO）中，以在水分散体中实现余辉发射。具有长寿命（约1.6秒）的CDs@SiO被用作能量供体，通过表面胶束自组装方法与各种有机染料构建非辐射能量转移系统。受益于CDs@SiO与有机染料之间的高能量转移效率，在水性介质中成功获得了多色余辉发射。作为概念验证，设计了一种以CDs@SiO为供体、Hg响应罗丹明衍生物为受体的比率磷光探针。Hg触发了供体-受体对之间的能量转移过程，从而实现了对Hg离子的灵敏检测。本文展示的工作为开发具有低背景干扰和易于识别信号的化学传感器提供了机会。
