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How do point defects like vacancies reduce electrical conductivity of graphene?

How do point defects like vacancies reduce electrical conductivity of graphene? Correct Answer Serve as scattering centers for electrons

Graphene exhibits point defects such as stone wales, single vacancies, adatoms etc. In the current methods used for the preparation of graphene, point defects are inevitable. These defects serve as electron scattering centers. Consequently, the transfers of electrons get affected resulting in the decrease of the conductivity of graphene.

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