中文摘要：本文研究了离子液体中N和S共掺杂碳量子点的长寿命光致发光性能，据此将离子液作为单源，使用超声波获得新型N和S共掺杂量子点进而构建出一个超灵敏高效的农药检测传感器。研究将该分析方法用于水果样本检测；并从试验结果和计算结论对该技术高灵敏度的原理进行了阐述。
外文摘要：Pesticides widely used in modern agriculture can impact on the environment and human health and hence it is important to develop highly sensitive detectors for pesticide residues. Optical methods based on photoluminescence (PL) properties provide an ideal approach to facile and accurate trace-level analysis of pesticides. Carbon Quantum Dots (CQDs) have been proposed as the photo-sensitizer for this purpose, however the optical properties of pure CQDs restrict the detection limit of such an approach. Doping is an effective strategy to introduce novel electronic structure into the CQDs to solve this problem. Here, using ionic liquids as a single source, novel N and S co-doped CQDs were obtained by a simple ultrasonic method. The doping in the structure introduces localized states which can trap photo-excited electrons and enhance their PL lifetime. These quantum dots are successfully used as the basis of a simple, efficient sensor for ultrasensitive pesticide detection (Limit of Detection = 5 ppb). Application of the analysis method to real fruit samples is demonstrated. The mechanism of the high sensitivity is also investigated and explained from experimental and calculation results. (C) 2016 Elsevier Ltd. All rights reserved.
作者：Haitao Li；Chenghua Sun；R.Vijayaraghavan
期刊名称：CARBON
期刊影响因子：6.198
出版年份：2016
出版刊次：3
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