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Reversible Electrical Reduction and Oxidation of Graphene Oxide

Ekiz, Okan Oner; Urel, Mustafa; Guner, Hasan; Mizrak, Alpay Koray; Dana, Aykutlu


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        "affiliation": "Bilkent Univ, UNAM Inst Mat Sci & Nanotechnol, TR-06800 Ankara, Turkey", 
        "name": "Ekiz, Okan Oner"
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      {
        "affiliation": "Bilkent Univ, UNAM Inst Mat Sci & Nanotechnol, TR-06800 Ankara, Turkey", 
        "name": "Urel, Mustafa"
      }, 
      {
        "affiliation": "Bilkent Univ, UNAM Inst Mat Sci & Nanotechnol, TR-06800 Ankara, Turkey", 
        "name": "Guner, Hasan"
      }, 
      {
        "affiliation": "Bilkent Univ, UNAM Inst Mat Sci & Nanotechnol, TR-06800 Ankara, Turkey", 
        "name": "Mizrak, Alpay Koray"
      }, 
      {
        "affiliation": "Bilkent Univ, UNAM Inst Mat Sci & Nanotechnol, TR-06800 Ankara, Turkey", 
        "name": "Dana, Aykutlu"
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    "description": "We demonstrate that graphene oxide can be reversibly reduced and oxidized using electrical stimulus. Controlled reduction and oxidation in two-terminal devices containing multilayer graphene oxide films are shown to result in switching between partially reduced graphene oxide and graphene, a process which modifies the electronic and optical properties. High-resolution tunneling current and electrostatic force imaging reveal that graphene oxide islands are formed on multilayer graphene, turning graphene into a self-assembled heterostructure random nanomesh. Charge storage and resistive switching behavior is observed in two-terminal devices made of multilayer graphene oxide films, correlated with electrochromic effects. Tip-induced reduction and oxidation are also demonstrated. Results are discussed in terms of thermodynamics of oxidation and reduction reactions.", 
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