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Interactions between Silica-Coated Gold Nanorod Substrates and Hydrophobic Analytes in Colloidal Surface-Enhanced Raman Spectroscopy
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-10-01 , DOI: 10.1021/acs.jpcc.9b06044 Hyunho Kang 1 , Christy Haynes 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-10-01 , DOI: 10.1021/acs.jpcc.9b06044 Hyunho Kang 1 , Christy Haynes 1
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Surface-enhanced Raman scattering (SERS)-based detection of suspension-phase analytes holds great promise for a variety of applications; however, plasmonic colloidal SERS substrates are not stable in many solution conditions unless they are protected by a stabilizing agent. Mesoporous silica shells on plasmonic nanoparticle cores have been demonstrated to perform well in a variety of liquid matrices. However, this silica shell can be seen as barrier from the perspective of the analyte, as the analyte molecules need to reach the plasmonic core after they pass through the shell. In this work, mesoporous silica-coated gold nanorods have been synthesized and characterized as aqueous colloidal SERS substrates systematically considering how SERS performance is impacted by three different factors: adsorbed molecules, the silica shell, and bulk solvent media. The results show that SERS signal intensities from the model hydrophobic analyte, trans-1,2-bis(4-pyridyl) ethylene (BPE), are enhanced when the pore size, hydrophobicity of the shell, and ionic strength are increased, indicating more favorable interaction between the substrates and the analyte. The silica shell presented herein facilitates efficient adsorption of the analyte to the gold core and enhanced sensitivity to environmental refractive index changes. This efficient adsorption can be further enhanced by controlling the incubation temperature. Overall, this work reveals how substrate exposure conditions can be tuned to maximize analyte SERS signals without compromising the silica shell that protects the plasmonic properties of the SERS-enhancing core.
中文翻译：
硅胶表面增强拉曼光谱中二氧化硅包覆的金纳米棒基质与疏水性分析物之间的相互作用
基于表面增强拉曼散射（SERS）的悬浮相分析物检测在各种应用中都具有广阔的前景。但是，等离子体胶体SERS底物在许多溶液条件下均不稳定，除非它们受到稳定剂的保护。已经证明，等离激元纳米颗粒核上的中孔二氧化硅壳在各种液体基质中表现良好。但是，从分析物的角度来看，该硅胶壳可被视为障碍，因为分析物分子在穿过外壳后需要到达等离激元核。在这项工作中，介孔二氧化硅包覆的金纳米棒已被合成并表征为水性胶体SERS底物，系统地考虑了三种不同因素如何影响SERS性能：吸附分子，二氧化硅壳，和大量溶剂介质。结果表明，SERS信号强度来自模型疏水性分析物，当增加孔径，壳的疏水性和离子强度时，反式-1,2-双（4-吡啶基）乙烯（BPE）会增强，表明底物与分析物之间的相互作用更为有利。本文介绍的二氧化硅壳有助于将分析物有效吸附到金核上，并提高对环境折射率变化的敏感性。通过控制温育温度，可以进一步提高这种有效的吸附。总的来说，这项工作揭示了如何调整底物暴露条件以最大化分析物SERS信号，而不会损害保护SERS增强核的等离子特性的二氧化硅外壳。
更新日期：2019-10-01
中文翻译：
硅胶表面增强拉曼光谱中二氧化硅包覆的金纳米棒基质与疏水性分析物之间的相互作用
基于表面增强拉曼散射（SERS）的悬浮相分析物检测在各种应用中都具有广阔的前景。但是，等离子体胶体SERS底物在许多溶液条件下均不稳定，除非它们受到稳定剂的保护。已经证明，等离激元纳米颗粒核上的中孔二氧化硅壳在各种液体基质中表现良好。但是，从分析物的角度来看，该硅胶壳可被视为障碍，因为分析物分子在穿过外壳后需要到达等离激元核。在这项工作中，介孔二氧化硅包覆的金纳米棒已被合成并表征为水性胶体SERS底物，系统地考虑了三种不同因素如何影响SERS性能：吸附分子，二氧化硅壳，和大量溶剂介质。结果表明，SERS信号强度来自模型疏水性分析物，当增加孔径，壳的疏水性和离子强度时，反式-1,2-双（4-吡啶基）乙烯（BPE）会增强，表明底物与分析物之间的相互作用更为有利。本文介绍的二氧化硅壳有助于将分析物有效吸附到金核上，并提高对环境折射率变化的敏感性。通过控制温育温度，可以进一步提高这种有效的吸附。总的来说，这项工作揭示了如何调整底物暴露条件以最大化分析物SERS信号，而不会损害保护SERS增强核的等离子特性的二氧化硅外壳。
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