Yi Zhiyu, Lin Le, Luo Xuda, Ning Yanxiao, Fu Qiang
State Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
J Phys Chem Lett. 2023 Mar 2;14(8):2163-2170. doi: 10.1021/acs.jpclett.3c00184. Epub 2023 Feb 21.
Interfacial interaction plays a crucial rule in catalysis over supported catalysts, and the catalyst-support interaction needs to be explored at microscopic scale. Here, we use the scanning tunneling microscope (STM) tip to manipulate CrO dinuclear clusters on Au(111) and find that the CrO-Au interaction can be weakened by an electric field in the STM junction, facilitating rotation and translation of the individual clusters at the imaging temperature (78 K). Surface alloying with Cu makes the manipulation of the CrO clusters hard due to the enhanced CrO-substrate interaction. Density functional theory calculations reveal that barrier for translation of a CrO cluster on the surface can be increased by surface alloying, influencing the tip manipulation. Our study demonstrates that the oxide-metal interfacial interaction can be probed by STM tip manipulation of supported oxide clusters, which provides a new method to investigate the interfacial interaction.
界面相互作用在负载型催化剂的催化过程中起着关键作用，需要在微观尺度上探索催化剂与载体之间的相互作用。在此，我们使用扫描隧道显微镜（STM）针尖操纵Au(111)上的CrO双核簇，发现STM结中的电场可削弱CrO与Au之间的相互作用，从而在成像温度（78 K）下促进单个簇的旋转和平移。与Cu进行表面合金化会使CrO簇的操纵变得困难，这是由于CrO与基底之间的相互作用增强所致。密度泛函理论计算表明，表面合金化会增加表面上CrO簇平移的势垒，从而影响针尖操纵。我们的研究表明，通过STM针尖操纵负载型氧化物簇可以探测氧化物-金属界面相互作用，这为研究界面相互作用提供了一种新方法。
