目的 制备不同浓度碳点的未掺杂分心木碳点(1-CDs)/聚乙烯醇复合膜和氮掺杂分心木碳点(2-CDs)/聚乙烯醇复合膜，以延长草莓的货架期。方法 采用流延法制备复合膜，探讨不同浓度CDs对复合膜的光致发光行为、疏水性、力学性能、紫外吸收性能和阻隔性能的影响，并比较不同薄膜对草莓的保鲜效果。结果 碳点和聚乙烯醇分子内或分子间发生了较强的相互作用，碳点的加入增强了复合膜的疏水性和紫外吸收性能，2-CDs/PVA-6复合膜在60 s时的接触角为65.3°，断裂伸长率和拉伸强度分别为(220.6±6.3)%、(107.55±4.9)MPa，2-CDs/PVA-6复合膜在波长300 nm时的紫外可见光透过率接近0，该复合膜对草莓的保鲜效果最好。结论 作为包装材料，2-CDs/PVA-6复合膜表现出潜在的应用价值，能够延长草莓的货架期。

The work aims to prepare undoped diaphragma juglandis carbon dots (1-CDs)/PVA composite films and nitrogen-doped diaphragma juglandis carbon dots (2-CDs)/PVA composite films with different concentrations of carbon dots to extend the shelf life of strawberries. The composite films were prepared by tape casting and the effects of different concentrations of CDs on photoluminescence, hydrophobicity, UV absorption and barrier properties of the composite films were studied. The preservation effects of different films on strawberry were compared. The strong intramolecular or intermolecular interaction occurred between carbon dots and PVA. The addition of carbon dots enhanced the hydrophobicity and UV absorption properties of the composite films. The contact angle of 2-CDs/PVA-6 composite film at 60 s was 65.3°, the elongation at break and the tensile strength were (220.6±6.3)% and (107.55±4.9)MPa, respectively. The ultraviolet and visible light transmit of 2-CDs/PVA-6 composite film was close to 0 at 300 nm wavelength. The composite film had the best preservation effect on strawberry. As a packaging material, 2-CDs/PVA-6 composite film shows the potential to extend the shelf life of strawberries.