表面增强拉曼光谱在纳米材料催化体系中的应用

Research of Surface-Enhanced Raman Spectroscopy on Nanomaterials Catalysis

纳米材料催化体系在材料、化学、生物学、医学等领域有广泛的应用。表面增强拉曼(SERS)技术能够提供催化剂本身以及表面物种的结构信息,可以实现原位条件下(高温/高压/复杂体系)的催化研究,获得催化反应过程中从水相到固相的分子变化的实时监测,是对其他谱学技术有利的提升。除了贵金属、双金属纳米材料催化SERS基底的SERS增强来源于电磁场增强机制以外,SERS纳米复合材料基底的SERS增强机制一般为电磁场增强与化学增强共同起到作用。

Nanomaterials catalytic system has been widely used in materials,chemistry,biology,medicine and other fileds.Surface-enhanced Raman scattering(SERS)is a phenomenon that Raman signals are greatly enhanced due to the adsorption of some molecules on the surface of rough metal nanoparticles or other nanomaterials.Nanomaterials catalytic SERS substrate possesses both catalysis and SERS activity.The introduction of SERS active substrate materials may reduce the catalytic active sites on the catalyst surface and the catalytic efficiency.On the other hand,the different adsorption properties of the molecules on the catalytically active materials and SERS active materials may cause the SERS detection signals to not truly reflect the real process of catalytic reaction,which greatly restrict their application for monitoring the catalytic process.Therefore,the design of nanomaterials catalytic SERS substrate is particularly important to balance the catalytic and SERS activity of composite materials.Nanomaterials catalytic SERS substrates show promising applications in environmental monitoring,food safety,biomedicine and other fields.Based on the stimulus response of small molecules and heavy metal ions to nanomaterials catalytic reaction,some probes without Raman scattering cross-section,such as small molecules,heavy metal ions,and biomolecules can be indirectly detected,while such molecules can not be directly detected by the interaction with the substrate through the SERS technology.The research of nanomaterials catalytic SERS substrate materials has great value in theory and real applications with broad prospects in the field of catalytic mechanism and monitoring as well as ultrasensitive biosensing.