Colorimetric and fluorescent detection of F⁻ have attracted enormous interest owing to their simplicity, low-cost and high selectivity. However, traditional colorimetric and fluorescent sensors mainly based on the insoluble and toxic organic molecules, which is not favorable for sensing F⁻ in water media and living cells. In this work, we designed fluorescent carbon dots (CDs) with excellent water solubility and good biocompatibility as a colorimetric and fluorescent dual-model probe for the detection of F⁻. The CDs were prepared by a green, one-step hydrothermal strategy from wheat straw without any additives and surface passivation. The obtained CDs exhibited a bright blue fluorescence, special response to F⁻ and low cytotoxicity. More interestingly, a significant color change from light yellow to red can be observed by the naked eye upon addition of F⁻ ions to the CDs solution probably due to the formation of hydrogen bonding between CDs and F⁻. Besides, the fluorescence of CDs also can be selectively quenched by F⁻ with the detection limit of about 49 μM. Additionally, the CDs are also applied to intracellular imaging and sensing of F⁻ in living cells. This strategy may provide a new method for the detection of F⁻ in water media and biological systems.

色度和F的荧光检测^-吸引了由于其简单性极大的兴趣，低成本和高选择性。然而，传统的比色和荧光传感器主要是基于不溶性的和有毒的有机分子，这是不用于感测˚F有利^-在水介质和活细胞。在这项工作中，我们设计了荧光碳点（CDS）具有优良的水溶性和良好的生物相容性作为检测f的比色和荧光双探头模型^- 。CD是通过绿色的一步式水热策略从麦草制备的，无需任何添加剂和表面钝化处理。所获得的光盘呈现出明亮的蓝色荧光，到F特殊反应^-和低细胞毒性。更有趣的是，从浅黄一个显著颜色变为红色，可以通过肉眼在加入的F观察^-离子到CDS溶液可能是由于CD和F之间的形成氢键的^- 。此外，光盘还荧光可以选择性地被F骤冷^-约49μM的检测极限。此外，该CD是也适用于细胞内成像和F的检测^-在活细胞。这种策略可以用于检测的F提供了一种新方法^-在水介质和生物系统。