材料科学
等离子体子
纳米颗粒
纳米技术
等离子纳米粒子
芯(光纤)
壳体(结构)
领域(数学)
光电子学
复合材料
数学
纯数学
作者
Ramesh Asapu,Radu‐George Ciocarlan,Nathalie Claes,Natan Blommaerts,Matthias Minjauw,Tareq Ahmad,Jolien Dendooven,Pegie Cool,Sara Bals,Siegfried Denys,Christophe Detavernier,Silvia Lenaerts,Sammy W. Verbruggen
标识
DOI:10.1021/acsami.7b13965
摘要
Silver nanoparticles are widely used in the field of plasmonics because of their unique optical properties. The wavelength-dependent surface plasmon resonance gives rise to a strongly enhanced electromagnetic field, especially at so-called hot spots located in the nanogap in-between metal nanoparticle assemblies. Therefore, the interparticle distance is a decisive factor in plasmonic applications, such as surface-enhanced Raman spectroscopy (SERS). In this study, the aim is to engineer this interparticle distance for silver nanospheres using a convenient wet-chemical approach and to predict and quantify the corresponding enhancement factor using both theoretical and experimental tools. This was done by building a tunable ultrathin polymer shell around the nanoparticles using the layer-by-layer method, in which the polymer shell acts as the separating interparticle spacer layer. Comparison of different theoretical approaches and corroborating the results with SERS analytical experiments using silver and silver-polymer core-shell nanoparticle clusters as SERS substrates was also done. Herewith, an approach is provided to estimate the extent of plasmonic near-field enhancement both theoretically as well as experimentally.
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