黑磷（BP）纳米片可淬灭荧光染料的荧光，基于这一特性，合成了可特异性识别人乳腺癌细胞MCF7的脱氧核糖核酸（DNA）适体，并用荧光染料5-羧基荧光素(FAM)将其标记。当BP纳米片与该适体混合时，其荧光被淬灭。而当MCF7细胞存在时，DNA适体由于可以识别该细胞并与之结合，会从BP纳米片上脱离,从而实现荧光恢复。恢复的荧光强度与细胞数量呈线性关系。实验结果表明,利用BP纳米片检测乳腺癌细胞具有高效、特异、灵敏的优势，这一方法可以推广至其他肿瘤细胞的检测。

Black phosphorus (BP) nanosheets can quench the fluorescence of a fluorescent dye, and based on this property, the deoxyribonucleic acid(DNA) aptamer which can specifically recognize the human breast cancer cells MCF7 are synthesized and labeled with 5-carboxyfluorescein (FAM). When the DNA aptamer is mixed with BP nanosheets, its fluorescence is quenched. However, in the presence of MCF7 cells, the DNA aptamer can recognize the MCF7 cells and interact with these cells, and the disassociation of DNA aptamer from BP nanosheets occurs and then the restoration of fluorescence is realized. The fluorescence intensity shows the linear relationship with the number of cancer cells. The experimental results indicate that it is highly efficient, specific and sensitive to use BP nanosheets for detecting breast cancer cells and this method can be applied in the detection of other kinds of cancer cells.