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← ScienceWhich mechanism limits electrical conductivity in graphene oxide films with varying oxygen content?
A)Increased phonon scattering from lattice defects
B)Reduced electron mobility from epoxide groups✓
C)Enhanced electron tunneling across oxidized areas
D)Suppressed ionic conductivity from oxygen vacancies
💡 Explanation
As oxygen content increases in graphene oxide, density of epoxide and hydroxyl groups increases, disrupting the delocalized π electron system and thereby reducing electron mobility through bond modification. Therefore, reduced electron mobility limits conductivity, rather than lattice defects, tunneling, or ionic effects which necessitate alternative material conditions.
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