This study demonstrates a facile solvothermal approach to synthesizing green fluorescent carbon dots (G‐CDs) using baby pumpkin as a natural precursor. The G‐CDs exhibit strong fluorescence emission at 547 nm under excitation at 467 nm, and the highest quantum yield reaching 17.5 % in acetone, making them suitable for a range of applications including sensing, bioimaging, catalysis, and drug delivery. The G‐CDs demonstrate excellent stability under various conditions, such as prolonged light exposure, high salt concentration, extended periods, and elevated temperatures. Furthermore, the G‐CDs show a good linear relationship with Cd2+ within the concentration range of 0 to 16.5 μmol/L, with a linear correlation coefficient of 0.9920. The detection limit (LOD) was calculated to be 0.68 μmol/L. The recovery rate ranges between 85.66% to 97.43%, indicating their potential for use in environmental metal ion detection. This study provides a convenient and economical method for the synthesis of G‐CDs using baby pumpkin as a precursor, offering a sustainable alternative for various applications in sensing, imaging, catalysis, and drug delivery.

中文翻译：

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小南瓜衍生荧光碳点的绿色合成——一种用于 Cd2+ 测定的有效无标记探针

这项研究展示了一种利用小南瓜作为天然前体合成绿色荧光碳点（G-CD）的简便溶剂热方法。 G-CD在467 nm激发下在547 nm处表现出强烈的荧光发射，在丙酮中最高量子产率达到17.5%，使其适用于传感、生物成像、催化和药物输送等一系列应用。 G-CD 在各种条件下表现出优异的稳定性，例如长时间曝光、高盐浓度、长时间使用和高温。此外，G-CD与Cd表现出良好的线性关系2+在0～16.5 μmol/L浓度范围内，线性相关系数为0.9920。计算出检测限(LOD)为0.68 μmol/L。回收率在85.66%至97.43%之间，表明其在环境金属离子检测中的应用潜力。这项研究为使用小南瓜作为前体合成 G-CD 提供了一种方便且经济的方法，为传感、成像、催化和药物输送等各种应用提供了可持续的替代方案。