Electron tunneling through redox flavoprotein molecules (glucose oxidase) is investigated at the single‐molecule level with in situ electrochemical scanning tunneling microscopy (STM; see image). By adjusting the substrate potential, the Fermi levels of the substrate and tip are shifted relative to the energy levels of the proteins, while an increasing tunneling current between the substrate and the STM tip via the flavoprotein molecules is observed.
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