Evolution of Electrical, Chemical, and Structural Properties of Transparent and Conducting Chemically Derived Graphene Thin Films
| Autor: | Stefano Agnoli, Daniel Mastrogiovanni, K. Andre Mkhoyan, Cecilia Mattevi, Manishkumar Chhowalla, Gaetano Granozzi, Goki Eda, Eric Garfunkel, Steve Miller, Ozgur Celik |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Materials science
Graphene Oxide chemistry.chemical_element Nanotechnology Conductivity Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Biomaterials Chemical state Delocalized electron chemistry.chemical_compound Chemical engineering chemistry law Electrochemistry Thin film Carbon Graphene oxide paper |
| Zdroj: | Advanced Functional Materials. 19:2577-2583 |
| ISSN: | 1616-3028 1616-301X |
| Popis: | A detailed description of the electronic properties, chemical state, and structure of uniform single and few-layered graphene oxide (GO) thin films at different stages of reduction is reported. The residual oxygen content and structure of GO are monitored and these chemical and structural characteristics are correlated to electronic properties of the thin films at various stages of reduction. It is found that the electrical characteristics of reduced GO do not approach those of intrinsic graphene obtained by mechanical cleaving because the material remains significantly oxidized. The residual oxygen forms sp3 bonds with carbon atoms in the basal plane such that the carbon sp2 bonding fraction in fully reduced GO is ∼0.80. The minority sp3 bonds disrupt the transport of carriers delocalized in the sp2 network, limiting the mobility, and conductivity of reduced GO thin films. Extrapolation of electrical conductivity data as a function of oxygen content reveals that complete removal of oxygen should lead to properties that are comparable to graphene. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text