TY - JOUR
T1 - Evolution of electrical, chemical, and structural properties of transparent and conducting chemically derived graphene thin films
AU - Mattevi, Cecilia
AU - Eda, Goki
AU - Agnoli, Stefano
AU - Miller, Steve
AU - Mkhoyan, K. Andre
AU - Celik, Ozgur
AU - Mastrogiovanni, Daniel
AU - Cranozzi, Caetano
AU - Carfunkel, Eric
AU - Chhowalla, Manish
PY - 2009
Y1 - 2009
N2 - A detailed description of the electronic properties, chemical state, and structure of uniform single and few-layered graphene oxide (CO) thin films at different stages of reduction is reported. The residual oxygen content and structure of CO 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 sp3bonds with carbon atoms in the basal plane such that the carbon sp2bonding fraction in fully reduced CO is ~0.80. The minority sp3bonds disrupt the transport of carriers delocalized in the sp2network, limiting the mobility, and conductivity of reduced CO 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.
AB - A detailed description of the electronic properties, chemical state, and structure of uniform single and few-layered graphene oxide (CO) thin films at different stages of reduction is reported. The residual oxygen content and structure of CO 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 sp3bonds with carbon atoms in the basal plane such that the carbon sp2bonding fraction in fully reduced CO is ~0.80. The minority sp3bonds disrupt the transport of carriers delocalized in the sp2network, limiting the mobility, and conductivity of reduced CO 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.
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U2 - 10.1002/adfm.200900166
DO - 10.1002/adfm.200900166
M3 - Article
AN - SCOPUS:70349231471
SN - 1616-301X
VL - 19
SP - 2577
EP - 2583
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 16
ER -