SERS技术研究光催化过程中催化剂表面分子取向的变化

SERS Monitor the Change of Molecular Orientation on Catalyst Surface During Photocatalysis

伴随着可持续发展的需求,光催化作为一种能够直接利用太阳能转化为化学能的技术已经被广泛应用于有机合成领域,尤其是利用光催化技术实现有机反应中最重要的C—C键的构筑,已经广泛应用于医药、染料和电子工业等方面[1]。而表面增强拉曼光谱具备检测灵敏度高,原位检测等优势,可以有效显示光催化过程中物质的结构变化信息,是研究催化过程中分子在催化剂表面的反应过程的有力手段[2]。该工作合成了一种兼具优良SERS增强性能和一定光催化活性的Ag-AgCl-Pd基底,通过原位监测光催化偶联反应的进程,揭示了催化剂表面分子取向的变化,同时探究了该变化对不同反应物反应效率的影响。

With the demand of sustainable development,photocatalysis can directly convert solar energy into chemical energy,has been widely used in the field of organic synthesis,especially in the construction of the most important C—C bond in organic reactions,which has been widely used in medicine,dye and electronics industries[1].Surface enhanced Raman spectroscopy has the advantages of high detection sensitivity and in situ detection,which can effectively reveal the change in structure information of photocatalyst during the reaction process.Therefore,it is a powerful technology to study the reaction process of reactant molecules on the surface of catalyst in the process of photocatalysis[2].In this work,we have synthesized Ag-AgCl-Pd substrate with excellent SERS activity and a certain photocatalytic activity.By in situ monitoring the process of photocatalytic coupling reaction,we revealed the change of molecular orientation on the catalyst surface and its influence on the reaction efficiency of different reactants.