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Direct Measurement Of Electron Transport Features In Cytochrome C Via V–I Characteristics Of STM Currents

J. Morimoto, H. Tanaka, T. Kawai
Published 2005 · Chemistry

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Abstract The morphology of and electron tunneling through single and cluster cytochrome c molecules deposited on self-assembled dodecanthiol monolayer film on a gold substrate have been studied experimentally using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy. STM images of a single cytochrome c molecule revealed a globular structure with a diameter of ∼4 nm and height of ∼1.5 nm. A spectroscopic study obtained by recording tunneling current–bias voltage (V–I) curves revealed that the STM current increases stepwise at asymmetric threshold sample bias voltages of +100 mV and –200 mV.
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