Tang Siyuan, Wang Yiru, Guo Guoqiang, Li Tingting, Xing Haoming, Hu Houwen, Leng Xuan, Gu Chenjie, Chen Da
Department of Microelectronic Science and Engineering, School of Physical Science and Technology, Ningbo University, Ningbo 315211, PR China; Department of Materials Science and Engineering, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University of Science and Technology, Shenzhen 518055, PR China.
Department of Microelectronic Science and Engineering, School of Physical Science and Technology, Ningbo University, Ningbo 315211, PR China.
Sci Total Environ. 2023 May 10;872:162277. doi: 10.1016/j.scitotenv.2023.162277. Epub 2023 Feb 16.
The growing persistence of harmful ion or drug molecular residues has always been considered as a matter of concern due to its importance in biological and environmental processes, which requires taking measures to maintain environmental health sustainably and effectively. Inspired by the multi-system and visual quantitative detection of nitrogen-doped carbon dots (N-CDs), we develop a novel cascade nano-system based on dual emission carbon dots for on-site visual quantitative detection of curcumin and fluoride ion (F). Herein, tris (hydroxymethyl) aminomethane (Tris) and m-dihydroxybenzene (m-DHB) are elected as reaction precursors to synthesize dual-emission N-CDs by a one-step hydrothermal method. The obtained N-CDs exhibit dual emission peaks at 426 nm (blue) and 528 nm (green) with quantum yields of 53 % and 71 %, respectively. Then, trace curcumin and F intelligent off-on-off sensing probe is formed by taking advantage of the activated cascade effect. As for the occurrence of inner filter effect (IFE) and fluorescence resonance energy transfer (FRET), the green fluorescence of N-CDs quenches remarkably, called as OFF initial state. Then the curcumin-F complex leads to the hypochromatic shift of the absorption band from 532 to 430 nm, which activates the green fluorescence of N-CDs, named as ON state. Meanwhile, the blue fluorescence of N-CDs is quenched due to the FRET, called as OFF terminal state. This system shows good linear relationships from 0 to 35 μM and 0 to 40 μM with low detection limits of 29 nM and 42 nM for curcumin and F ratiometric detection, respectively. Moreover, a smartphone-assisted analyzer is developed for on-site quantitative detection. Furthermore, we design a logic gate for logistics information storage, which proves the possibility of a logic gate based on N-CDs in practical application. Thus, our work will provide an effective strategy for environmental quantitative monitoring and information storage encryption.
有害离子或药物分子残留的持久性不断增加，因其在生物和环境过程中的重要性，一直被视为一个值得关注的问题，这就需要采取措施来可持续且有效地维护环境健康。受氮掺杂碳点（N-CDs）多系统和可视化定量检测的启发，我们开发了一种基于双发射碳点的新型级联纳米系统，用于姜黄素和氟离子（F）的现场可视化定量检测。在此，选用三（羟甲基）氨基甲烷（Tris）和间二羟基苯（m-DHB）作为反应前体，通过一步水热法合成双发射N-CDs。所获得的N-CDs在426 nm（蓝色）和528 nm（绿色）处呈现双发射峰，量子产率分别为53%和71%。然后，利用激活的级联效应形成痕量姜黄素和F智能开-关-关传感探针。至于内滤效应（IFE）和荧光共振能量转移（FRET）的发生，N-CDs的绿色荧光显著猝灭，称为初始关闭状态。然后姜黄素-F络合物导致吸收带从532 nm向430 nm发生减色位移，从而激活N-CDs的绿色荧光，称为开启状态。同时，由于FRET，N-CDs的蓝色荧光被猝灭，称为最终关闭状态。该系统在0至35 μM和0至40 μM范围内显示出良好的线性关系，姜黄素和F比率检测的低检测限分别为29 nM和42 nM。此外，还开发了一种智能手机辅助分析仪用于现场定量检测。此外，我们设计了一个用于物流信息存储的逻辑门，这证明了基于N-CDs的逻辑门在实际应用中的可能性。因此，我们的工作将为环境定量监测和信息存储加密提供一种有效的策略。
