卤化物
胶体金
表面等离子共振
离子
吸附
化学
卤化银
纳米颗粒
无机化学
光化学
材料科学
纳米技术
物理化学
有机化学
图层(电子)
作者
Zhiqiang Zhang,Haiwen Li,Feng Zhang,Yihui Wu,Zhen Guo,Lianqun Zhou,Jiadong Li
出处
期刊:Langmuir
[American Chemical Society]
日期:2014-03-03
卷期号:30 (10): 2648-2659
被引量:70
摘要
We present a facile method for fabricating spongelike Au structures by halide-induced aggregation and fusion of gold nanoparticles (AuNPs). Halide ions (F–, Cl–, Br–, and I–) showed distinctly different effects on the synthesized AuNPs, which were characterized by localized surface plasmon resonance (LSPR) and dynamic light scattering measurements. A noticeable red-shift in the LSPR peak was found after Br– and I– ion treatment, which indicates the adsorption of halide atoms or ions on the AuNPs. The surface potential of AuNPs varied by treatment with different types of halides; this finding indicates that different halide ions have different effects on the AuNPs. Br– and I– ions showed strong affinity toward the AuNPs. The different affinities of halide ions toward the AuNPs play an important role in controlling the formation process of spongelike gold. Citrate ions adsorbed on AuNPs were displaced by halide ions to different extents. Such displacement determined the aggregation and fusion behaviors of the AuNPs and eventually the formation of different spongelike structures.
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