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We show that the low temperature electron transport properties of chemicallyfunctionalized graphene can be explained as sequential tunneling of chargesthrough a two dimensional array of graphene quantum dots (GQD). Below 15 K, atotal suppression of current due to Coulomb blockade through GQD array wasobserved. Temperature dependent current-gate voltage characteristics showCoulomb oscillations with energy scales of 6.2-10 meV corresponding to GQDsizes of 5-8 nm while resistance data exhibit an Efros-Shklovskii variablerange hopping arising from structural and size induced disorder.

Coulomb Blockade and Hopping Conduction in Graphene Quantum Dots Array