Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 31: Poster: Organic Molecules on Inorganic Substrates
O 31.14: Poster
Dienstag, 19. März 2024, 18:00–20:00, Poster C
Quantum transport across single-molecule junctions bridging adlayer-modified electrodes — •Mong-Wen Gu1,3, Chi-Ta Lai1, I-Chih Ni2, Chih-I Wu2, and Chun-hsien Chen1 — 1Department of Chemistry, National Taiwan University, Taipei, Taiwan — 2Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei, Taiwan — 3Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, Jülich, Germany
To explore the complexity of quantum transport across single-molecule junctions, it is essential to develop new types of electrode materials beyond gold electrodes which are overwhelmingly popular due to their reliability and inertness in the fabrication of molecule junctions. Herein, two electrochemical techniques, underpotential deposition and surface-limited redox replacement, were used to prepare gold electrodes which were modified by an atomic layer of platinum and palladium. The single-molecule conductance of α,ω-hexanes (X-(CH2)n-X, X = -SCH3 and -CN, n = 4,6,8) on the bimetallic electrodes was found to be 2*30 times higher than that on bare gold electrodes. This enhanced conductance is ascribed to the partially filled d-shells on the bimetallic electrodes. Such a feature leads to a significantly increased SDOS at the Fermi energy and thus to an improved efficiency of interfacial transport. This work demonstrates a rational strategy for engineering the molecule-metal surface to develop emergent single-molecule testbeds.
Keywords: molecular electronics; atomic force microscopy; electrodeposition