纳米黑磷在储能、传感、催化等领域具有很好的应用前景,但纳米黑磷的应用仍受限于其苛刻的制备方法。目前,纳米黑磷的制备方法主要是剥离黑磷法。剥离黑磷法主要包括有机溶剂剥离法和水溶液剥离法。有机溶剂剥离法存在有机溶剂难以去除、不环保等问题。水溶液剥离法存在剥离过程纳米黑磷易氧化,一定程度上影响剥离制得纳米黑磷的质量。因此,开发绿色环保且高效的剥离黑磷制备高质量纳米黑磷的方法具有重要意义。采用液氮辅助剪切剥离法制备纳米黑磷,利用液氮(l-N2)分子插层及气化膨胀作用,结合高速剪切作用,破坏层间范德华力,实现纳米黑磷的高效制备;利用液氮及挥发的氮气保护纳米黑磷,降低其氧化程度,实现了高质量纳米黑磷的制备;此外,该方法用液氮作为剥离溶剂,绿色环保无污染,具有很好的发展前景。
Nano black phosphorus has great application prospects in energy storage,sensing,catalysis,and other fields.However,its application is still limited by the demanding preparation methods.Currently,the main method for preparing nano black phosphorus is the exfoliation method.The exfoliation method includes organic solvent exfoliation and aqueous solution exfoliation.The organic solvent exfoliation method has issues such as the difficulty of removing organic solvents and environmental concerns.The aqueous solution exfoliation method suffers from oxidation during the exfoliation process,which affects the quality of the obtained nano black phosphorus to a certain extent.Therefore,it is of great significance to develop a green and efficient exfoliation method for preparing high-quality nano black phosphorus.In this study,a liquid nitrogen-assisted shear exfoliation method was employed to prepare high-quality nano black phosphorus.By utilizing the intercalation of liquid nitrogen (l-N2) molecules and the gasification expansion effect,combined with high-speed shearing,the interlayer van der Waals forces were disrupted,enabling the efficient preparation of nano black phosphorus.Furthermore,liquid nitrogen and evaporating nitrogen gas were utilized to protect the nano black phosphorus,reducing its degree of oxidation and achieving the preparation of high-quality nano black phosphorus.Moreover,this method used liquid nitrogen as the exfoliation solvent,ensuring a green and pollution-free process,and thus exhibiting promising development prospects.
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基金资助
国家自然科学基金(21968012和22168021)
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