Local Refractive Index Sensing Based on Edge Gold-Coated Silver Nanoprisms
Local Refractive Index Sensing Based on Edge Gold-Coated Silver Nanoprisms
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DOI：
10.1021/jp408187e
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发表时间：
2013-11-07
影响因子：
3.7
通讯作者：
Liedberg, Bo
中科院分区：
文献类型：
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作者：
Martinsson, Erik;Shahjamali, Mohammad Mehdi;Liedberg, Bo
研究了基于边缘镀金银纳米棱镜（GSNPs）和金纳米球的局域表面等离子体共振（LSPR）传感的体积和表面折射率灵敏度，并与传统的基于传播表面等离子体的表面等离子体共振（SPR）传感进行了比较。混合GSNP受益于改进的稳定性，因为保护位于银纳米棱镜（SNP）边缘和尖端处的不稳定的银刻面的金框架防止了它们的尖锐尖端或边缘的截断或圆化，即使在苛刻条件下也保持了高折射率灵敏度。通过使用聚电解质的逐层沉积和蛋白质吸附，我们发现GSNPs在近距离（
Bulk and surface refractive index sensitivity for localized surface plasmon resonance (LSPR) sensing based on edge gold-coated silver nanoprisms (GSNPs) and gold nanospheres was investigated and compared with conventional surface plasmon resonance (SPR) sensing based on propagating surface plasmons. The hybrid GSNPs benefit from an improved stability since the gold frame protecting the unstable silver facets located at the silver nanoprisms (SNPs) edges and tips prevents truncation or rounding of their sharp tips or edges, maintaining a high refractive index sensitivity even under harsh conditions. By using layer-by-layer deposition of polyelectrolytes and protein adsorption, we found that GSNPs exhibit 4-fold higher local refractive index sensitivity in close proximity (