Emeraldine Salt Form of Polyaniline as a Probe Molecule for Surface Enhanced Raman Scattering Substrates Excited at 1064 nm
Emeraldine Salt Form of Polyaniline as a Probe Molecule for Surface Enhanced Raman Scattering Substrates Excited at 1064 nm
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DOI：
10.1021/jp406352r
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发表时间：
2013-09-05
影响因子：
3.7
通讯作者：
Temperini, Marcia L. A.
中科院分区：
文献类型：
--
作者：
Nobrega, Marcelo M.;Souza, Klester S.;Temperini, Marcia L. A.
聚苯胺与金属纳米颗粒缔合可能产生性能的组合/协同作用，引起了人们的广泛关注。本文描述了一项研究，使用翠绿亚胺盐形式的聚苯胺 (PANI-ES) 作为探针分子，验证了几种金纳米结构作为表面增强拉曼散射 (SERS) 基底的有效性。 PANI-ES 在 1064 nm 处的表面增强共振拉曼散射 (SERRS) 光谱由两种增强效应产生：一种来自 PANI-ES 共振拉曼，另一种来自当等离激元波长接近近红外区域时金纳米结构的局域表面等离激元共振。使用金纳米板胶体悬浮液作为底物可以获得 10 nM 水平的 PANI-ES 相当大的 SERRS 强度。 PANI-ES 的 SERRS 光谱以及 Au 纳米结构在 1064 nm 处的 SERRS 强度与局域表面等离子体共振消光之间的高度相关性表明，增强主要是由于电磁机制。这些结果表明 PANI-ES 可用作通用探针分子，用于评估 1064 nm 激发下的 SERRS 底物性能。
Associating polyaniline and metallic nanoparticles may result in the combination/synergism of properties, which have been attracting great attention. This paper describes an investigation that verified the effectiveness of several gold nanostructures acting as surface enhanced Raman scattering (SERS) substrates using the emeraldine salt form of PANI (PANI-ES) as a probe-molecule. The surface enhanced resonance Raman scattering (SERRS) spectra of PANI-ES at 1064 nm results from two enhancement effects: one from the PANI-ES resonance Raman and the other from localized surface plasmon resonance of the gold nanostructures when the plasmon wavelength approaches the NIR region. A considerable SERRS intensity for PANI-ES at the 10 nM level could be obtained using a gold nanoplates colloidal suspension as substrates. The SERRS spectra of PANI-ES and the high correlation between SERRS intensity and LSPR extinction of Au nanostructures at 1064 nm indicate that the enhancement was mostly due to the electromagnetic mechanism. These results indicate that PANI-ES can be employed as a general probe-molecule for the evaluation of SERRS substrates performance at 1064 nm excitation.