Journal
LANGMUIR
Volume 26, Issue 20, Pages 16005-16012Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la101776m
Keywords
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Funding
- SERC Fast Track scheme of the Department of Science and Technology, Government of India [SR/FTP/CS-66/2006]
- Indian Association for the Cultivation of Science, Kolkata
- Council of Scientific and Industrial Research, Government of India
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Ferritin, the iron-storage protein, holds great potential for bioelectronic applications because of the presence of an electronically conducting iron core. We have applied scanning tunneling microscopy (STM), a high-resolution imaging method based on direct tunneling, to visualize the ferritin molecules both in the iron-containing holo form and in the iron-free apo form, and we have probed the electron flow through the two forms of this protein by measuring the current-voltage response using scanning tunneling spectroscopy (STS). Clear distinctions could be made among the current-voltage responses of the metallic gold(111) substrate surface, holoferritin molecules, and apoferritin molecules at room temperature. When warmed to the near-physiological temperature of 40 degrees C, the current-voltage response of the holoferritin molecules exhibited no band gap resembling near-metallic behavior, and the apoferritin molecules exhibited only a reduced band gap.
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