Nitrogen-Doped Carbon Quantum Dots from Polyethyleneimine for Optical Dual Mode Determination of Cu2+ and L-Cysteine and Its Logic Gate Operation.,ACS Applied Materials & Interfaces

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Nitrogen-Doped Carbon Quantum Dots from Polyethyleneimine for Optical Dual Mode Determination of Cu2+ and L-Cysteine and Its Logic Gate Operation.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-09-21 , DOI: 10.1021/acsami.0c12750
Xuerui Liu ₁ , Shengxiao Zhang ₁ , Hui Xu ₁ , Ruru Wang ₁ , Lina Dong ₁ , Shanmin Gao ₁ , Boyang Tang ₂ , Weina Fang _{3,

4} , Faju Hou ₁ , Linlin Zhong ₁ , Ali Aldalbahi ₅

Affiliation

In this work, nitrogen-doped carbon quantum dots from poly(ethyleneimine) (PQDs) were synthesized by a low-cost and facile one-step hydrothermal method without other reagents. A quantum yield (QY) of up to 23.2% with maximum emission at 460 nm under an excitation wavelength of 340 nm was ascribed to the high nitrogen doping (20.59%). The PQDs selectively form a blue complex with Cu²⁺ accompanied by strong quenching of the fluorescence emission. Meanwhile, the PQD-Cu²⁺ complex exhibited selective fluorescence recovery and color disappearance on exposure to l-cysteine (Cys). The electron transfer from amino or oxygen groups on the PQDs to Cu²⁺ leads to fluorescence quenching, and a chromogenic reaction of the cuprammonium complex results in a color change. The strong affinity between Cys and Cu²⁺ causes the detachment of Cu²⁺ from the surface of PQDs, so the color of the solution disappears and the fluorescence of PQDs recovers. Under the optimized condition, the proposed sensor was applied to detect Cu²⁺ in the linear range of 0–280 μM. A detection limit of 4.75 μM is achieved using fluorescence spectroscopy and 4.74 μM by monitoring the absorbance variation at 272 nm. For Cys detection, the linear range of 0–800 μM with detection limits of 28.11 μM (fluorescence determination) and 19.74 μM (peak shift determination at 272 nm) was obtained. Meanwhile, the PQD-Cu²⁺ system exhibits distinguishable responses to other biothiols such as l-glutathione (GSH) and dl-homocysteine (Hcy). Based on the multimode signals, an “AND” logic gate was constructed successfully. Interestingly, besides Cu²⁺, Fe³⁺ can also quench the fluorescence of PQDs and the PQD-Fe³⁺ system exhibits superior selectivity for Cys detection. Most importantly, the proposed assay is not only simple, cheap, and stable but also suitable for detecting Cu²⁺ and Cys in some real samples.

中文翻译：

聚乙烯亚胺中的氮掺杂碳量子点，用于光学双模测定Cu2 +和L-半胱氨酸及其逻辑门操作。

在这项工作中，通过低成本且简便的一步水热法合成了由聚乙烯亚胺（PQDs）制成的氮掺杂碳量子点，而无需其他试剂。高氮掺杂（20.59％）归因于在340 nm激发波长下在460 nm处具有最大发射的量子产率（QY）高达23.2％。PQD选择性地与Cu ²⁺形成蓝色络合物，并伴随强烈的荧光发射猝灭。同时，PQD-Cu ²⁺复合物暴露于1-半胱氨酸（Cys）时显示选择性的荧光恢复和颜色消失。电子从PQD上的氨基或氧基团转移到Cu ²⁺导致荧光猝灭，铜铵配合物的显色反应导致颜色变化。Cys和Cu ²⁺之间的强亲和力导致Cu ²⁺从PQD的表面脱离，因此溶液的颜色消失，PQD的荧光恢复。在最佳条件下，该传感器被应用于检测线性范围为0–280μM的Cu ²⁺。使用荧光光谱法可达到4.75μM的检出限，通过监测272 nm处的吸光度变化可达到4.74μM的检出限。对于Cys检测，获得了0-800μM的线性范围，检测限为28.11μM（荧光测定）和19.74μM（272 nm峰位移测定）。同时，PQD-Cu ²⁺该系统对其他生物硫醇如1-谷胱甘肽（GSH）和dl-同型半胱氨酸（Hcy）表现出明显的响应。基于多模信号，成功构建了“与”逻辑门。有趣的是，除了Cu ²⁺之外，Fe ³⁺还可以淬灭PQD的荧光，PQD-Fe ³⁺系统对Cys检测具有优越的选择性。最重要的是，所提出的测定方法不仅简单，便宜且稳定，而且适用于检测某些真实样品中的Cu ²⁺和Cys。

更新日期：2020-10-21

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