We developed high-yield green fabrication of colloidal silicon quantum dots (QDs) only by low-temperature treatment of porous silicon (PSi) flakes in a reactive organic solution. Heat treatment at ∼50 °C of the PSi flakes in unsaturated hydrocarbon solution mixed with hydrofluoric acid (HF) yields the organically self-surface-passivated Si QD, which exhibit efficient photoluminescence compared with the conventional PSi. The production yield of Si QDs is enhanced by increasing the heat-treatment temperature and HF concentration, and the best results were obtained at ∼50 °C and 50%, respectively. The dispersibility of the prepared Si QDs in the solvents can be controlled by using appropriate organic function groups. The efficient transformation into Si QDs without waste is based on thermal cracking of weakly interconnected Si cores of PSi. Performing a practical clean process, the present result provides a promising route for overcoming limitations in the conventional colloidal QD preparation methods.

中文翻译：

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多孔硅低温热裂解高产绿色制备胶体硅量子点

我们仅通过在反应性有机溶液中对多孔硅 (PSi) 薄片进行低温处理，就开发了胶体硅量子点 (QD) 的高产绿色制造。PSi 薄片在与氢氟酸 (HF) 混合的不饱和烃溶液中在~50°C 下热处理产生有机自表面钝化的 Si QD，与传统的 PSi 相比，它表现出有效的光致发光。通过提高热处理温度和 HF 浓度可以提高 Si QDs 的产率，分别在~50°C 和 50% 时获得最佳结果。制备的Si QDs在溶剂中的分散性可以通过使用适当的有机官能团来控制。无浪费地有效转化为 Si QD 是基于 PSi 的弱互连 Si 核的热裂解。