具有均匀表面的二维金膜电极界面吸附SERS光谱研究

SERS Investigation on Interfacial Adsorption at Uniform 2D Gold Nanoparticles Film

表面增强拉曼光谱(SERS)作为一种表界面物种分析和检测的强有力技术,能够提供低至单分子水平的非破坏性和超高灵敏性的分子指纹振动信息,在表面科学、生物科学及分析科学等领域发挥重要作用。然而SERS技术在实际应用上仍然面临严峻的挑战,SERS技术实际应用的拓展仍依赖于一种高活性、高稳定性、高重现性以及较好的均匀性的SERS基底。在通过气-液界面组装二维膜SERS基底电极,以振动频率对表面电势十分敏感的KSCN为探针分子,开展了表面增强活性及表面电势均匀性研究,并与传统电化学粗糙金电极性能对比。结果表明二维金膜基底可视为一种高度均匀的、且高重现性的SERS基底,适合于电化学SERS研究。

As a non-destructive technology,surface-enhanced Raman spectroscopy(SERS)provides the rich molecular fingerprint vibrational information with ultra-high sensitivity at single molecular level.It plays an important role in the fields of surface,biological and analytical science.Unfortunately,it still remains remarkable challenges in practical application.Definitely,the extension to practical application of SERS is critically depended the reliable substrate with high activity,stability,reproducibility and uniformity.Herein,the two-dimensional Au film electrode was fabricated through the formation of compact Au nanoparticles film at the gas-liquid interface.The surface potential and uniformity were explored based on the probe of KSCN accordingly,and the results were compared to the conventional Au electrode.It demonstrated that the two-dimensional gold film substrate could be served as a highly uniform and reproducible SERS substrate,and it was suitable for electrochemical SERS studies.