Abstract The rapid on-filed detection of organophosphorus herbicide residue is a challenge for environmental protection as well as food safety. In this connection we have developed a CdTe-CQD integrated probe for the detection of herbicide glyphosate in aqueous medium. The photoluminescence (PL) spectrum of CdTe-CQD pair shows diminished fluorescence at 619 nm due to efficient photoelectron transfer from CdTe to CQD. When glyphosate is added into CdTe-CQD at pH 8, the disintegration of pair takes place hence which inhibits the PET process and regains the emission intensity of the probe at 619 nm. This sensing protocol works well in real samples. The fluorescence assay for glyphosate (F/F0) covers a linear concentration range from 0 to 1000 nM and the detection limit is found to be 2 pM. Compared to previously reported quantum dot and metal nanoparticle based sensing methods our sensor is simple and works for a broad linear range with high sensitivity. The specific and selective recognition of our probe towards glyphosate even in presence of other organophosphorus pesticides makes it suitable for practical applications.

中文翻译：

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通过 CdTe 和壳聚糖衍生碳点之间的有效光电子转移对草甘膦进行超灵敏检测

摘要 有机磷除草剂残留的快速立案检测是环境保护和食品安全的一大挑战。在这方面，我们开发了一种 CdTe-CQD 集成探针，用于检测水性介质中的除草剂草甘膦。由于从 CdTe 到 CQD 的有效光电子转移，CdTe-CQD 对的光致发光 (PL) 光谱在 619 nm 处显示出减弱的荧光。当草甘膦在 pH 值为 8 时加入 CdTe-CQD 中时，会发生对的分解，从而抑制 PET 过程并重新获得探针在 619 nm 处的发射强度。这种传感协议在实际样本中运行良好。草甘膦荧光检测 (F/F0) 的线性浓度范围为 0 到 1000 nM，检测限为 2 pM。与之前报道的基于量子点和金属纳米粒子的传感方法相比，我们的传感器简单，适用于高灵敏度的宽线性范围。即使在其他有机磷农药存在的情况下，我们的探针对草甘膦的特异性和选择性识别使其适用于实际应用。