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Title: Electron tunnelling through single azurin molecules can be on/off switched by voltage pulses

Redox metalloproteins are emerging as promising candidates for future bio-optoelectronic and nano-biomemory devices, and the control of their electron transfer properties through external signals is still a crucial task. Here, we show that a reversible on/off switching of the electron current tunnelling through a single protein can be achieved in azurin protein molecules adsorbed on gold surfaces, by applying appropriate voltage pulses through a scanning tunnelling microscope tip. The observed changes in the hybrid system tunnelling properties are discussed in terms of long-sustained charging of the protein milieu.
Authors:
 [1] ;  [2] ; ; ;  [1]
  1. Biophysics and Nanoscience Centre, DEB-CNISM, Università della Tuscia, I-01100 Viterbo (Italy)
  2. (Italy)
Publication Date:
OSTI Identifier:
22399023
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CONTROL; ELECTRIC POTENTIAL; ELECTRON TRANSFER; ELECTRONS; GOLD; METALLOPROTEINS; MOLECULES; SCANNING TUNNELING MICROSCOPY; SURFACES; TUNNEL EFFECT