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Your search keyword '"Luo, Xuda"' showing total 10 results
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10 results on '"Luo, Xuda"'

9. Periodic Arrays of Metal Nanoclusters on Ultrathin Fe-Oxide Films Modulated by Metal-Oxide Interactions

Author

Luo, Xuda, Sun, Xiaoyuan, Yi, Zhiyu, Lin, Le, Ning, Yanxiao, Fu, Qiang, and Bao, Xinhe

Abstract

Rational design of highly stable and active metal catalysts requires a deep understanding of metal–support interactions at the atomic scale. Here, ultrathin films of FeO and FeO2–xgrown on Pt(111) are used as templates for the construction of well-defined metal nanoclusters. Periodic arrays of Cu clusters in the form of monomers and trimers are preferentially located at FCC domains of FeO/Pt(111) surface, while the selective location of Cu clusters at FeO2domains is observed on FeO2–x/Pt(111) surface. The preferential nucleation and formation of well-ordered Cu clusters are driven by different interactions of Cu with the Fe oxide domains in the sequence of FeO2-FCC > FeO-FCC > FeO-HCP > FeO-TOP, which is further validated by density functional theory calculations. It has been revealed that the p-band center as a reactivity descriptor of surface O atoms determines the interaction between metal adatoms and Fe oxides. The modulated metal-oxide interaction provides guidance for the rational design of supported single-atom and nanocluster catalysts.

Published
2023
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10. Oxide-Metal Interaction Probed by Scanning Tunneling Microscope Manipulation of Cr 2 O 7 Clusters on Au(111).

Author

Yi Z, Lin L, Luo X, Ning Y, and Fu Q

Abstract

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 Cr 2 O 7 dinuclear clusters on Au(111) and find that the Cr 2 O 7 -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 Cr 2 O 7 clusters hard due to the enhanced Cr 2 O 7 -substrate interaction. Density functional theory calculations reveal that barrier for translation of a Cr 2 O 7 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.

Published
2023
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