Branched Gold Nanochains Facilitated by Polyvinylpyrrolidone and their SERS Effects on p-Aminothiophenol
Branched Gold Nanochains Facilitated by Polyvinylpyrrolidone and their SERS Effects on p-Aminothiophenol
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DOI：
10.1021/jp803102h
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发表时间：
2008-09
影响因子：
3.7
通讯作者：
Dong-Feng Zhang;Li-Ya Niu;Li Jiang;P. Yin;Ling-Dong Sun;Hua Zhang;Rui Zhang;Lin Guo;Chunhua Yan
中科院分区：
文献类型：
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作者：
Dong-Feng Zhang;Li-Ya Niu;Li Jiang;P. Yin;Ling-Dong Sun;Hua Zhang;Rui Zhang;Lin Guo;Chunhua Yan
在聚乙烯吡咯烷酮（PVP）的辅助下，在室温下制备了具有分支特征的稳定的金纳米链。连接和融合过程被认为是形成链状结构的原因。在此过程中，PVP既作为结构导向剂，又作为稳定剂，以抑制尺寸的连续增加。紫外-维斯-近红外光谱研究表明，这种独特的结构使纵向表面等离子体共振带（LSPR）移动到1457 nm，这可能赋予产品新的应用。以对氨基苯硫酚为探针分子，研究了其表面增强拉曼散射活性。沉积在Si衬底上的薄膜产物对a1型带的增强因子为（1.03 ± 0.74）× 10 ~ 6，对b2型带的增强因子为（1.32 ± 0.15）× 10 ~ 7。a1模式的增强归因于电磁机制，而b2模式的额外EF被假定为来自化学效应。
Stable gold nanochains with branched features were fabricated at room temperature with the assistance of polyvinylpyrrolidone (PVP). An attachment and fusion process was believed to responsible for the formation of the chain-like structure. During the process, PVP acted both as a structure-directing agent and as a stabilizer to inhibit continuous size increase. UV−vis−NIR study revealed that the unique structure shifted the longitudinal surface plasma resonant band (LSPR) to as far as 1457 nm, which may endow the product with new applications. The surface-enhanced Raman scattering activity was investigated with p-aminothiophenol as probe molecule. The enhancement factor (EF) of the products deposited as film on the Si substrate was estimated to be (1.03 ± 0.74) × l06 for the a1-type band, while it was (1.32 ± 0.15) × l07 for b2-type band. The enhancement of a1 modes was attributed to the electromagnetic mechanism, whereas the additional EF for the b2 mode is presumed to contribute from the chemical effect.