分别使用带有巯基的化合物半胱胺(Cys)、胱胺(CYS)、巯基丁二酸(MSA)和巯基乙醇(ME)对金/二氧化硅纳米核壳粒子(GNs)进行表面化学修饰.利用动态光散射(DLS)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)和紫外-可见吸收光谱(UV-Vis)对修饰后的GNs进行表征.研究结果显示Cys和CYS修饰后GNs胶体溶液稳定性下降,核壳结构完整性破坏,从而导致其在近红外区最大吸收峰消失.而MSA和ME修饰的GNs胶体溶液稳定,金壳结构完整,光学性质稳定.这可能是由于Cys和CYS的胺基通过与金壳之间产生静电力作用和配位作用,破坏了GNs表面金壳.
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