Ultrasensitive Surface Plasmon Resonance Detection of Trinitrotoluene by a Bis-aniline-Cross-Linked Au Nanoparticles Composite,Journal of the American Chemical Society

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Ultrasensitive Surface Plasmon Resonance Detection of Trinitrotoluene by a Bis-aniline-Cross-Linked Au Nanoparticles Composite
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2009-06-03 , DOI: 10.1021/ja9001212
Michael Riskin ₁ , Ran Tel-Vered ₁ , Oleg Lioubashevski ₁ , Itamar Willner ₁

Affiliation

A bis-aniline-cross-linked Au nanoparticles (NPs) composite is electropolymerized on Au surfaces. The association of trinitrotoluene, TNT, to the bis-aniline bridging units via pi-donor-acceptor interactions allows the amplified detection of TNT by following the surface plasmon resonance (SPR) reflectance changes as a result of the coupling between the localized plasmon of the AuNPs and the surface plasmon wave associated with the gold surface. The detection limit for analyzing TNT by this method is approximately 10 pM. The electropolymerization of the bis-aniline-cross-linked AuNPs composite in the presence of picric acid results in a molecular-imprinted matrix for the enhanced binding of TNT. The imprinted AuNPs composite enabled the sensing of TNT with a detection limit that corresponded to 10 fM. Analysis of the SPR reflectance changes in the presence of different concentrations of TNT revealed a two-step calibration curve that included the ultrasensitive detection of TNT by the imprinted sites in the composite, KassI. for the association of TNT to the imprinted sites, 6.4 x 10(12) M-1, followed by a less sensitive detection of TNT by the nonimprinted pi-donor bis-aniline sites (KNIass. = 3.9 x 10(9) M-1). The imprinted AuNPs composite reveals impressive selectivity. The structural and functional features of the bis-aniline-cross-linked AuNPs composites were characterized by different methods including ellipsometry, AFM, and electrochemical means. The dielectric properties of the AuNPs composite in the presence of different concentrations of TNT were evaluated by the theoretical fitting of the respective experimental SPR curves. The ultrasensitive detection of the TNT by the AuNPs composite was attributed to the changes of the dielectric properties of the composite, as a result of the formation of the pi-donor-acceptor complexes between TNT and the bis-aniline units. These changes in the dielectric properties lead to a change in the conductivity of the AuNPs matrix.

中文翻译：

双苯胺交联金纳米颗粒复合材料对三硝基甲苯的超灵敏表面等离子体共振检测

双苯胺交联的 Au 纳米粒子 (NPs) 复合材料在 Au 表面上电聚合。三硝基甲苯，TNT，通过π-供体-受体相互作用与双苯胺桥接单元的结合允许通过跟随表面等离子体共振（SPR）反射率变化来放大检测TNT，这是由于局部等离子体之间的耦合导致的。 AuNPs 和与金表面相关的表面等离子体波。通过这种方法分析 TNT 的检测限约为 10 pM。在苦味酸存在下，双苯胺交联的 AuNPs 复合材料的电聚合产生了用于增强 TNT 结合的分子印迹基质。印迹的 AuNPs 复合材料能够以对应于 10 fM 的检测限检测 TNT。对存在不同浓度 TNT 时 SPR 反射率变化的分析揭示了一个两步校准曲线，其中包括通过复合材料 KassI 中的印迹位点对 TNT 的超灵敏检测。对于 TNT 与印迹位点的关联，6.4 x 10(12) M-1，然后通过非印迹 pi 供体双苯胺位点 (KNIass. = 3.9 x 10(9) M- 1）。印迹的 AuNPs 复合材料显示出令人印象深刻的选择性。双苯胺交联的 AuNPs 复合材料的结构和功能特征通过不同的方法进行表征，包括椭圆光度法、AFM 和电化学方法。AuNPs 复合材料在不同浓度 TNT 存在下的介电性能通过各自实验 SPR 曲线的理论拟合进行评估。AuNPs复合材料对TNT的超灵敏检测归因于复合材料介电性能的变化，这是TNT和双苯胺单元之间形成π-供体-受体复合物的结果。介电特性的这些变化导致 AuNPs 基质的电导率发生变化。

更新日期：2009-06-03

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