It is difficult to form Ag nanoparticles in white glass due to lack of Fe ~ ( 2 + ) as reducing agent, thus the volume fraction of Ag nanoparticles is very low in white glass, and the surface plasma resonance absorption can not be observed obviously. 由于白硅酸盐玻璃不含二价铁离子,因此,银纳米颗粒形成困难,颗粒体积分数非常低,以致样品中银纳米颗粒的共振吸收峰不明显。