Nitrogen and sulfur co-doped green fluorescent carbon dots (G-CDs) with quantum yield (QY) of 28.26% were synthesized by hydrothermal method with p-phenylenediamine and thiosemicarbazone as precursors. The synthesized G-CDs exhibit good sensitivity and anti-interference ability for detecting copper ion (Cu2+) by fluorescence quenching (λex=390 nm, λem=535 nm) with a linear range of 20 to 200 μM and the limit of detection of 4.8 μM. This analytical method has been applied to detect Cu2+ of the local lake with good accuracy and recovery.

中文翻译：

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高量子产率氮硫共掺杂碳点的制备用于灵敏检测Cu2+

以对苯二胺和缩氨基硫脲为前驱体，采用水热法合成了氮硫共掺杂绿色荧光碳点（G-CDs），量子产率（QY）为28.26%。合成的G-CD对荧光猝灭（λex=390 nm，λem=535 nm）检测铜离子（Cu2+）表现出良好的灵敏度和抗干扰能力，线性范围为20~200 μM，检测限为4.8微米。该分析方法已应用于当地湖泊中Cu2+的检测，具有良好的准确度和回收率。