在十二烷基苯磺酸钠(SDBS)和聚乙烯吡咯烷酮(PVP)的混合水溶液中,通过水合肼还原硝酸银制备了分布均匀、粒度可控的纳米片状银.使用紫外可见光谱(UV-vis)对不同反应时间的溶胶进行分析,结合扫描电子显微镜(SEM)的表征结果,探讨了SDBS/PVP复合体系中,纳米银溶胶的光谱特征以及银纳米片的形成过程.研究结果表明,随着反应时间的延长,5 min内将获得长、宽、厚度都小于100 nm的片状粒子,60 min时得到的是长、宽超过400 nm,分布均匀的片状银粒子.片状纳米银的形成过程中,SDBS中的磺酸基被吸附到PVP的内酰胺基链上,通过对Ag+的吸附缔合作用,首先会形成粒径较小的单晶银粒子,进一步生长聚合成大尺度的多边形片状银粉.形成的银溶胶呈现出多个表面等离子共振(SPR)吸收峰.
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