目的 基于纳米铜在空气中易被氧化的缺点，制备单分散纳米铜颗粒，并研究改性对其抗氧化性能的影响。方法 通过丙三醇-水二元溶剂热法用抗坏血酸还原Cu2+制备纳米铜颗粒。研究丙三醇/水体积比、抗坏血酸用量、聚乙烯吡咯烷酮（PVP）浓度对纳米铜粒径及分散性的影响，并采用柠檬酸和油酸对其进行表面改性处理。结果 研究发现，当丙三醇和水的体积比为3∶2，抗坏血酸浓度为0.004 mol/L，PVP浓度为0.006 mol/L时，能够得到粒径均一（(80±10) nm）且分散性良好的纳米铜。真空环境下保存的纳米铜只有纯铜晶相，但在空气中保存30 d后部分被氧化为氧化铜或氧化亚铜。采用柠檬酸改性纳米铜在室温到243 ℃范围内能保持良好的热稳定性。结论 采用丙三醇-水二元溶剂热法制备出了粒径均一、分散性良好的纳米铜。柠檬酸与油酸改性能够显著提高纳米铜的抗氧化与热稳定性能，其改性后在空气中保存30 d仍不被氧化。

The work aims to prepare the monodisperse nano-copper particles in a green way and study the effect of modification on its oxidation resistance based on the shortcomings of nano-copper being easily oxidized in air. Nano-copper particles were prepared by reduction of Cu2+ with ascorbic acid by the glycerol-water binary solvothermal method. The effects of glycerol/water volume ratio, ascorbic acid dosage and polyvinylpyrrolidone (PVP) concentration on the particle size and dispersibility of nano-copper were studied. The surface modification treatment of nano-copper was carried out with citric acid and oleic acid. The study showed that, under the following conditions: glycerol/water volume ratio of 3︰2, ascorbic acid concentration of 0.004 mol/L, and PVP concentration of 0.006 mol/L, nano-copper with uniform particle size ((80±10) nm) and good dispersibility could be obtained. The nano-copper preserved in a vacuum environment had only a pure copper crystal phase, but was partially oxidized to copper oxide or cuprous oxide after being stored in air for 30 days. The citric acid modified nano-copper could maintain good thermal stability at 243 ℃. Nano-copper prepared by glycerol-water binary solvothermal method has uniform particle size and good dispersibility. The modification with citric acid and oleic acid can significantly improve the oxidation resistance and thermal stability of nano-copper. After modification, it is not oxidized after being stored in air for 30 days.