Engineering of spin states in porphyrin - graphene nanoribbon hybrid systems
Solid State and Surface Chemistry, Material Synthesis
Final Report Abstract
In this project, we have done pioneering studies on the fabrication and characterization of porphyrin-graphene nanoribbon (Por-GNR) hybrid systems by using scanning tunneling microscopy, scanning tunneling spectroscopy, atomic force microscopy and density functional theory. The defect free and high yield Por-GNRs, featuring three zigzag edge GNR (3ZGNR) backbone with porphyrin periodically embedded on both sides of zigzag edge, are acquired by standard two-step on-surface synthesis strategy on Au(111). Such novel Por-3ZGNR shows highly dispersive frontier bands with lower band gap comparing to its pristine counterparts. The electronic structures and magnetic states can be engineered by varying the transition metal centers in the porphyrin units, such as causing the energy level shifts, and inducing new energy bands. The magnetic anisotropy energy of the metal centers is strongly influenced by their locations and the length of the ribbon, in which the porphyrin configuration is varied due to the strain after fusing to 3ZGNR backbone. Towards the potential usage in electronic devices, we seek for a feasible way to transfer the ultrahigh vacuum grown Por-3ZGNRs to ambient conditions. This project will open a new pathway on designing novel hybrid Graphene systems for enhanced electronic and magnetic properties for spintronics.
Publications
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Effect of an axial ligand on the self-assembly of molecular platforms. Physical Chemistry Chemical Physics, 24(47), 28864-28869.
Li, Chao; Meng, Xiangzhi; Weismann, Alexander; von Glasenapp, Jan-Simon; Hamer, Sebastian; Xiang, Feifei; Pignedoli, Carlo A.; Herges, Rainer & Berndt, Richard
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Charge State-Dependent Symmetry Breaking of Atomic Defects in Transition Metal Dichalcogenides
Xiang, F., Huberich, L., Vargas, P. A., Torsi, R., Allerbeck, J. & Tan, A. M. Z. ... & Schuler, B.
