Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
Faculty of Food Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China.
Mikrochim Acta. 2024 Feb 16;191(3):141. doi: 10.1007/s00604-024-06225-3.
The one-step synthesis of Mn-doped carbon quantum dots (Mn-CPDs) with a high quantum yield (QY = 45%) is reported using the microwave-assisted method. Subsequently, Mn-CPDs were successfully combined with Eu ions to construct an Eu@Mn-CPDs fluorescence sensor. The presence of tetracycline (TC) induced a transition of fluorescence emission from blue (434 nm) to red (618 nm), and a robust linear relationship was observed between the ratio of F / F and the TC concentration (5 - 50 nmol/L), with a limit of detection (LOD) of 5.76 nmol/L. The underlying mechanism of Eu@Mn-CPDs and TC sensing is unveiled as a synergistic effect involving inner filter effect (IFE) and concurrent interactions. Notably, the smartphone-integrated sensing platform based on Eu@Mn-CPDs enables rapid and quantitative TC detection within a short time (< 30 s) by monitoring fluorescence color changes, achieving high-detection sensitivities (with a LOD of 6.18 nmol/L). This versatile and efficient sensing platform demonstrates its potential for the determination of TC concentrations in milk, honey, and tap water samples.
采用微波辅助法一步合成了量子产率高达 45%的掺锰碳量子点（Mn-CPDs）。随后，Mn-CPDs 成功与 Eu 离子结合，构建了 Eu@Mn-CPDs 荧光传感器。四环素（TC）的存在诱导荧光发射从蓝色（434nm）转变为红色（618nm），并且在 F / F 与 TC 浓度（5-50nmol/L）之间观察到强的线性关系，检测限（LOD）为 5.76nmol/L。Eu@Mn-CPDs 和 TC 传感的潜在机制揭示为内滤效应（IFE）和并发相互作用的协同效应。值得注意的是，基于 Eu@Mn-CPDs 的智能手机集成传感平台通过监测荧光颜色变化，能够在短时间内（<30s）快速、定量地检测 TC，实现了高检测灵敏度（LOD 为 6.18nmol/L）。这种多功能、高效的传感平台展示了其在牛奶、蜂蜜和自来水样品中 TC 浓度测定方面的应用潜力。
