The diiron ferroxidase centres of ferritins are required for Fe2+ oxidation and formation of the mineral core. Here, we show that the ferroxidase centres of bacterioferritin (Bfr) also play a key role in iron release, and that this is ...
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Connections to the Electrodes Control the Transport Mechanism in Single‐Molecule Transistors
Von Wiley-VCH zur Verfügung gestellt
The electron-transport mechanism in a single-molecule transistor can be changed from ‘particle-like hopping’ to ‘wave-like’ by changing the chemical structure of the molecule–electrode interface.
Abstract
When designing a molecular electronic device for a specific function, it is necessary to control whether the charge-transport mechanism is phase-coherent transmission or particle-like hopping. Here we report a systematic study of charge transport through single zinc-porphyrin molecules embedded in graphene nanogaps to form transistors, and show that the transport mechanism depends on the chemistry of the molecule–electrode interfaces. We show that van der Waals interactions between molecular anchoring groups and graphene yield transport characteristic of Coulomb blockade with incoherent sequential hopping, whereas covalent molecule–electrode amide bonds give intermediately or strongly coupled single-molecule devices that display coherent transmission. These findings demonstrate the importance of interfacial engineering in molecular electronic circuits.
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