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000000331 084__ $$2WoS$$aPhysics, Condensed Matter
000000331 1001_ $$0P:(DE-Juel1)VDB63965$$aLi, C.$$b0$$uFZJ
000000331 245__ $$aElectrochemical gate-controlled electron transport of redox-active single perylene bisimide molecular junctions
000000331 260__ $$aBristol$$bIOP Publ.$$c2008
000000331 300__ $$a374122
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000000331 440_0 $$03703$$aJournal of Physics: Condensed Matter$$v20$$x0953-8984
000000331 500__ $$aThis work was supported by the HGF Project 'Molecular Switches', the SPP 1243, the Volkswagen Foundation and the University of Berne and the Research Center Julich. IP acknowledges support of the German Academic Exchange Agency for a PhD fellowship. FE, AA and AB acknowledge support from the SPP 1243 'Center for Functional Nanostructures' situated at Karlsruhe University.
000000331 520__ $$aWe report a scanning tunneling microscopy (STM) experiment in an electrochemical environment which studies a prototype molecular switch. The target molecules were perylene tetracarboxylic acid bisimides modified with pyridine (P-PBI) and methylthiol (T-PBI) linker groups and with bulky tert-butyl-phenoxy substituents in the bay area. At a fixed bias voltage, we can control the transport current through a symmetric molecular wire Au|P-PBI(T-PBI)|Au by variation of the electrochemical 'gate' potential. The current increases by up to two orders of magnitude. The conductances of the P-PBI junctions are typically a factor 3 larger than those of T-PBI. A theoretical analysis explains this effect as a consequence of shifting the lowest unoccupied perylene level (LUMO) in or out of the bias window when tuning the electrochemical gate potential VG. The difference in on/off ratios reflects the variation of hybridization of the LUMO with the electrode states with the anchor groups. I(T)-E(S(T)) curves of asymmetric molecular junctions formed between a bare Au STM tip and a T-PBI (P-PBI) modified Au(111) electrode in an aqueous electrolyte exhibit a pronounced maximum in the tunneling current at -0.740, which is close to the formal potential of the surface-confined molecules. The experimental data were explained by a sequential two-step electron transfer process.
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000000331 7001_ $$0P:(DE-Juel1)VDB45469$$aPobelov, I.$$b3$$uFZJ
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000000331 7001_ $$0P:(DE-HGF)0$$aBegrets, A.$$b7
000000331 7001_ $$0P:(DE-HGF)0$$aEvers, F.$$b8
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