Abstract In this work, fluorescent carbon dots were synthesized from polyethylene glycol. The carbon dots are of sizes below 10 nm as confirmed through dynamic light scattering studies and transmission electron microscope images. Carbon dot was further conjugated with Ca 2+ to form metal-ion-conjugated polyethylene glycol carbon dot. The metal-ion-conjugated polyethylene glycol carbon dot exhibits enhanced photoluminescence properties. Fluorescence of the Ca-modified carbon dots was quenched in the presence of Trifluralin. The practical utility of the system was demonstrated by using it to detect Trifluralin contaminated soil sample. Also, an array of sensor plates prepared using the drop-casting method on glass plates showed visual changes in fluorescence in the presence of Trifluralin. Development of such fluorescent-based detection system will lead to visual detection kits for detecting herbicides in general. Graphical Abstract We developed a fluorescent-based metal conjugated polyethylene glycol carbon dot (Ca-PEG-CD) that was used to detect Trifluralin herbicide.

中文翻译：

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来自聚乙二醇的钙修饰碳点：氟乐灵除草剂的荧光检测

摘要 本研究以聚乙二醇为原料合成了荧光碳点。通过动态光散射研究和透射电子显微镜图像证实，碳点的尺寸小于 10 nm。碳点进一步与Ca 2+ 共轭形成金属离子共轭聚乙二醇碳点。金属离子共轭聚乙二醇碳点表现出增强的光致发光特性。在氟乐灵存在下，Ca 修饰的碳点的荧光被淬灭。通过使用该系统检测氟乐灵污染的土壤样品，证明了该系统的实用性。此外，在玻璃板上使用滴铸法制备的传感器板阵列在氟乐灵存在下显示出荧光的视觉变化。这种基于荧光的检测系统的开发将导致用于检测一般除草剂的视觉检测试剂盒。图形摘要 我们开发了一种基于荧光的金属共轭聚乙二醇碳点 (Ca-PEG-CD)，用于检测氟乐灵除草剂。