In this work, organophilic carbon nanodots (CNDs) were synthesized in acetone from organic extract of plant leaves. The as-prepared CNDs showed multi-band emission, and could be well dispersed in acetone and ethanol. The photoluminescence (PL) of the CNDs at 520[Formula: see text]nm was excitation-independent. The PL in the blue region could be tuned from 420 to 480[Formula: see text]nm through changing of the excitation wavelength. The multi-emissive CNDs were used as a ratiometric and colorimetric sensor for curcumin detection in ethanol. The blue PL of the CNDs at 420[Formula: see text]nm was quenched by curcumin through inner filter effect. Meanwhile, the green PL at 495[Formula: see text]nm and 535[Formula: see text]nm were enhanced with additional fluorescence of curcumin. The value of I[Formula: see text]/I[Formula: see text] and I[Formula: see text]/I[Formula: see text] both increased linearly with the curcumin concentration in the range of 0–15[Formula: see text][Formula: see text]M. The fluorescence color of the mixed solution changed from blue to yellow, and the detection limit reached 36.7[Formula: see text]nM. The sensitive and visual detection of the CNDs probe toward curcumin showed their high potential in practical applications.

中文翻译：

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具有多波段发射的亲有机碳纳米点及其作为比率和比色荧光传感器的应用

在这项工作中，在丙酮中从植物叶子的有机提取物中合成了亲有机碳纳米点 (CND)。所制备的CNDs显示出多波段发射，并且可以很好地分散在丙酮和乙醇中。CND 在 520 [公式：见正文] nm 处的光致发光 (PL) 与激发无关。通过改变激发波长，蓝色区域的 PL 可以从 420 调整到 480[公式：见正文]nm。多发射 CND 用作比率和比色传感器，用于检测乙醇中的姜黄素。CND 在 420[公式：见正文]nm 处的蓝色 PL 被姜黄素通过内部过滤效应淬灭。同时，姜黄素的额外荧光增强了 495[公式：见正文]nm 和 535[公式：见正文]nm 处的绿色 PL。I[公式：见正文]/I[公式：见正文]和I[公式：见文]/I[公式：见文]均随姜黄素浓度在0-15范围内线性增加[公式：见文][公式：见文]M. 混合溶液的荧光颜色由蓝色变为黄色，检测限达到36.7[公式：见正文]nM。CNDs探针对姜黄素的灵敏和视觉检测显示了它们在实际应用中的巨大潜力。