采用化学还原法先制备了表面吸附有十六烷基三甲基溴化铵的金纳米颗粒,然后以金纳米颗粒为籽晶,采用二乙基二硫代氨基甲酸锌和硝酸银分别作为锌源和银源,通过水热反应法制备出了Au＠Ag2 S＠ZnS 双壳核壳结构.XRD 分析表明样品中含有立方相的 Au、单斜相的 Ag2 S 与六方相的 ZnS.UV-Vis谱揭示样品的等离子体共振峰位可以通过改变硝酸银的加入量而控制.SEM 和 TEM 图像显示样品呈球形且壳层由许多小的纳米颗粒聚集而成,ZnS 壳层为多晶.由光致发光谱分析得知,随着硝酸银量的增加,主发光峰先是红移,然后峰位不变且强度减弱.这一光致发光现象一方面可能与反应过程中部分银离子掺入 ZnS 纳米壳层有关；另一方面可能源于 Ag2 S 中间层厚度的增加导致 ZnS 与 Au 的间距增加,从而导致Au 对 ZnS 的等离子增强效果减弱.
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