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Which 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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