As an emerging two-dimensional layered material, black phosphorus nanosheets show unparalleled optical and electronic properties. Although black phosphorus nanosheets have attracted much attention in the photoelectric field, their applications in biomedical field were still limited due to their poor biocompatibility of current synthesis strategies. Herein, we propose a novel synthetic strategy for black phosphorus nanosheets that rely on Tween 20-assisted liquid exfoliation and post-processing in deoxygenated water. Microscopic and spectroscopic analysis suggested that the produced black phosphorus nanosheets dispersions exhibited good stability and higher yield compared with other currently prepared methods. Because of their ultrahigh exfoliation efficiency, the black phosphorus flakes present few-layer and even monolayer, which are thinner than the most dispersions of black phosphorus. Thus, this method enables mass-production of high-quality few-layer black phosphorus with high biocompatibility, and has the potential to be directly used in the biological field.

中文翻译：

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超薄黑磷纳米片的液体剥离新策略。

作为一种新兴的二维分层材料，黑磷纳米片具有无与伦比的光学和电子性能。尽管黑磷纳米片在光电领域引起了广泛关注，但由于其目前的合成策略的生物相容性较差，其在生物医学领域的应用仍然受到限制。在本文中，我们提出了一种新的合成方法，用于依赖Tween 20辅助的液体去角质和在脱氧水中进行后处理的黑磷纳米片。显微镜和光谱分析表明，与其他目前制备的方法相比，制得的黑磷纳米片分散体表现出良好的稳定性和较高的产率。由于其超高的剥落效率，黑磷片呈现出几层甚至单层，它比大多数黑磷的分散体薄。因此，该方法能够以高生物相容性大量生产高质量的几层黑磷，并且具有直接用于生物领域的潜力。