中文摘要：

通过在金属纳米粒子表面包覆一层膜而形成核／壳结构，可以对金属纳米粒子的活性起到一定的保护作用，然而包覆层的保护效果会受到环境因素的影响。本文从湿度、酸碱度、老化时间三方面综述了环境因素对包覆壳层保护效果的影响，以及从热稳定性方面考察了包覆层的保护效果。并由此三方面和热稳定性方面提出了对包覆层的最佳选择，指出了今后的研究方向。

英文摘要：

The reactivity of metallic nanoparticles is well protected by coating them to form a core/shell structure, however, the protective effect will be affected by the environmental factors, the influence on the protective effect of the coating caused by the environmental factors, including humidity,PHvalue,ageing time, is reviewed;and the protective effect of coating about thermal stability is mentioned too. The optimal choice of coating is suggested by considering the three factors and thermal stability,and the research direction in the future are also indicated.