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Title: Excitation of the ligand-to-metal charge transfer band induces electron tunnelling in azurin

Optical excitation of azurin blue copper protein immobilized on indium-tin oxide, in resonance with its ligand-to-metal charge transfer absorption band, resulted in a light-induced current tunnelling within the protein milieu. The related electron transport rate is estimated to be about 10{sup 5} s{sup −1}. A model based on resonant tunnelling through an azurin excited molecular state is proposed. The capability of controlling electron transfer processes through light pulses opens interesting perspectives for implementation of azurin in bio-nano-opto-electronic devices.
Authors:
 [1] ;  [2] ; ;  [1]
  1. Biophysics and Nanoscience Centre, DEB-CNISM, Università della Tuscia, I-01100 Viterbo (Italy)
  2. (Italy)
Publication Date:
OSTI Identifier:
22283041
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 9; Other Information: (c) 2014 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; ABSORPTION; COPPER; COPPER COMPOUNDS; ELECTRIC CURRENTS; ELECTRON TRANSFER; ELECTRONS; EXCITATION; EXCITED STATES; LIGANDS; PROTEINS; TIN OXIDES; TUNNEL EFFECT; VISIBLE RADIATION