Attenuated total reflectance surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) plays a crucial role in understanding the interfacial reaction mechanisms at the molecular level, achieving an enhancement factor (EF) of up to 10³. However, when this technique is integrated with electrochemistry (EC-ATR-SEIRAS), the EF is significantly reduced by ten- to hundred-fold. Thus, understanding of the key parameters that contribute to the EF is of great importance in designing high-performance substrates and extending the application for EC-SEIRAS. In this study, we propose that the structure of the substrate for EC-ATR-SEIRAS consists of an enhancement unit (EU) supported on a conductivity unit (CU). The CU will screen the incident IR light reaching and interacting with the EU, resulting in a smaller EF as the CU thickness increases. Then, we introduce a strategy to optimize the performance of the EC-SEIRAS substrate by assembling a plasmonic antenna array as the EU that is supported on IR-transparent and conductive monolayer graphene as the CU. The established plasmon-enhanced EC-SEIRAS substrate demonstrates much higher IR enhancement, repeatability, and stability.

中文翻译：

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设计表面增强红外吸收光谱电化学高性能衬底的关键结构参数


衰减全反射表面增强红外吸收光谱 （ATR-SEIRAS） 在了解分子水平的界面反应机制方面起着至关重要的作用，可实现高达 10^{3 的}增强因子 （EF）。然而，当该技术与电化学 （EC-ATR-SEIRAS） 集成时，EF 显着降低了 10 到 100 倍。因此，了解影响 EF 的关键参数对于设计高性能基板和扩展 EC-SEIRAS 的应用非常重要。在这项研究中，我们提出 EC-ATR-SEIRAS 的基材结构由支撑在电导率单元 （CU） 上的增强单元 （EU） 组成。CU 将屏蔽到达 EU 并与 EU 相互作用的入射红外光，随着 CU 厚度的增加，EF 会变小。然后，我们介绍了一种策略，通过组装等离子体天线阵列作为 EU，该阵列以支持红外透明和导电的单层石墨烯作为 CU，从而优化 EC-SEIRAS 衬底的性能。已建立的等离子体增强 EC-SEIRAS 底物表现出更高的 IR 增强、可重复性和稳定性。