We have developed a simple and convenient route to prepare fluorescent carbon dots with dual emission peaks respectively at 470 and 570 nm. The prepared dual-emission carbon dots can be used for ratiometric detection of Fe3+ ions in the range from 0 to 50 μmol·L-1 with 0.8 μmol·L-1 detection limit based on the fluorescence quenching at 570 nm. The quenched fluorescence induced by Fe3+ ions could be recovered by pyrophosphate. We further used the carbon dots-Fe3+ ions-pyrophosphate mixed system for ratiometric detection of acid phosphatase in the range from 0.08 to 6.75 μg·mL-1 with 0.01 μg·mL-1 detection limit.

中文翻译：

---

用于 Fe3+ 离子和酸性磷酸酶比例检测的双发射碳点

我们开发了一种简单方便的方法来制备分别在 470 和 570 nm 处具有双发射峰的荧光碳点。制备的双发射碳点可用于0~50 μmol·L-1范围内Fe3+离子的比例检测，基于570 nm荧光猝灭的检测限为0.8 μmol·L-1。Fe3+离子诱导的猝灭荧光可以通过焦磷酸盐恢复。我们进一步使用碳点-Fe3+离子-焦磷酸混合系统对0.08-6.75 μg·mL-1范围内的酸性磷酸酶进行比率检测，检测限为0.01 μg·mL-1。