在AOT/正庚烷/氯金酸反相微乳液中,用水合肼作为还原剂制备了纳米金粒子,用紫外-可见光谱和透射电镜进行分析,系统地研究了水和表面活性剂摩尔比(ω=nH2O/nAOT)以及氯金酸浓度对粒径的影响.结果表明,制备的纳米金粒子粒径在4～12 nm、单分散性好.纳米金粒径与ω值存在线性关系.氯金酸的浓度对粒径的影响比较复杂,随着浓度增大,粒径先减小后增大.用FT-IR红外光谱解释了AOT的磺酸基对纳米金粒子表面有强烈的吸附作用,从而对合成的纳米金粒子有着很强的保护作用.
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