在异质纳米结构表面发生的新现象是当前研究的热点 .最近发现 ,尽管甘氨酸在纯Ag表面只能作物理吸附 ,蒸镀在Cu表面的单层Ag岛却能在Cu的帮助下 ,出现对甘氨酸作化学吸附的能力 ,这种现象是溢流效应的一种反映 .蒸镀在Ag表面的Cu岛也能帮助附近裸露的Ag表面获得化学吸附甘氨酸的能力 ,虽然这里已不是单原子层的银了 .结果说明这种溢流现象来源于CuAg在表面的纳米结构共存 ,而不只是这种共存的某个结构所特有的 .但是 ,由于Cu的表面能大于Ag,所以即使是在室温下 ,Cu岛也会逐渐地被一单层Ag原子完全覆盖 ,从而失去溢流的能力 .这说明要利用异质纳米结构系统的新的物质特性时 ,必须而且也有可能选择其中具有长期稳定性的结构 Recently, it has been found that although glycine can only physically adsorb on the pure Ag surface, the single Ag island deposited on the Cu surface can appear with the help of Cu The ability to chemisorb glycine is a reflection of the spillover effect.The Cu islands deposited on the Ag surface also help the bare Ag surface to gain the ability to chemically adsorb glycine although it is not monolayer Of the silver.The results show that this overflow phenomenon comes from the coexistence of CuAg on the surface of the nanostructures, not just the coexistence of a particular structure.However, due to Cu surface energy greater than Ag, even at room temperature , Cu island will also be gradually covered by a single layer of Ag atoms, thus losing the ability of overflow.This shows that to take advantage of the new material properties of heterogeneous nanostructured systems, it is necessary and possible to choose which has long-term stability Structure