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金/银芯-壳复合纳米颗粒的制备及光学吸收特性 被引量：1

Synthesis and Optical Absorption Properties of Au-Ag Core-Shell Composite Nanoparticles
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摘要 利用二步液相还原法制备了金/银金属-金属芯-壳复合结构的纳米颗粒. 用透射电子显微镜和紫外-可见分光光度计对颗粒的形貌和光学吸收特性进行了表征. 结果发现: 金芯/银壳复合结构的纳米颗粒呈现出单分散的球状分布, 其吸收光谱具有明显的双峰等离子体吸收特征, 一个吸收带位于纯银纳米颗粒的等离子体吸收峰附近(～390 nm), 另一个吸收带介于纯金和纯银纳米颗粒的等离子体吸收峰之间, 且随着反应液中金离子摩尔数的增加而产生红移;而银芯/金壳复合结构的纳米颗粒则为包含球状、三角状等结构的多分散体系, 其吸收光谱呈现单峰的等离子体吸收特征, 吸收峰介于纯金和纯银纳米颗粒的等离子体吸收峰之间, 随着反应液中金离子摩尔数的增加, 吸收峰将向长波方向移动,且吸收带的半极大全宽值(Full width half maximum,FWHM)将展宽. The core-shell gold/silver bimetallic compos-ite nanoparticles were synthesized by atwo-stepreductionin aqueous solution.The morphology and optical absorp-tion properties of as-prepared composite nanoparticleswere investigated by TEMand UV-vis spectroscopy.Inthe case of Ag-coated Au nanoshells ,the particles showmonodispersed spheroids and have two distinct plasmonabsorption bands ,the one centered at about 390 nm,andthe other which intervened between absorption peaks ofpure Au and pure Ag nanoparticles wou...
作者 闫仕农 王永昌
机构地区 中北大学物理系 西安交通大学理学院现代物理研究所
出处 《稀有金属》 EI CAS CSCD 北大核心 2005年第4期505-508,共4页 Chinese Journal of Rare Metals
基金 国家自然科学基金资助项目(60277003)
关键词 金 银 复合纳米颗粒 光学吸收特性 gold silver composite nanoparticles optical absorption properties
分类号 O614 [理学—无机化学]
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参考文献14

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二级参考文献3

共引文献35

同被引文献18

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稀有金属
2005年 第4期

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