title: Modulation of the Electrostatic and Quantum Capacitances of Few Layered Graphenes through Plasma Processing.
abstract: It is shown that charged defect generation, through argon ion-based plasma processing, in few layer graphene, could substantially enhance the electrical capacitance for electrochemical energy storage. Detailed consideration of the constituent space charge and quantum capacitances were used to delineate a new length scale, correlated to electrically active defects contributing to the capacitance, and was found to be smaller than a structural correlation length determined through Raman spectroscopy. The study offers insights into an industrially viable method (i.e., plasma processing) for modifying and enhancing the energy density of graphene-based electrochemical capacitors.
authors.forename: R
authors.initials: R
authors.lastname: Narayanan
authors.forename: H
authors.initials: H
authors.lastname: Yamada
authors.affiliation: §Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, United States.
authors.forename: M
authors.initials: M
authors.lastname: Karakaya
authors.affiliation: §Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, United States.|∥Clemson Nanomaterials Center, Clemson University, Anderson, South Carolina 29625, United States.
authors.forename: R
authors.initials: R
authors.lastname: Podila
authors.affiliation: §Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, United States.|∥Clemson Nanomaterials Center, Clemson University, Anderson, South Carolina 29625, United States.
authors.forename: A M
authors.initials: AM
authors.lastname: Rao
authors.affiliation: ⊥Program in Materials Science, Department of Mechanical Engineering, University of California, San Diego, La Jolla, California 92093, United States.
authors.forename: P R
authors.initials: PR
authors.lastname: Bandaru
keywords: Graphene; charge correlation; charged defects; energy storage; plasma processing; quantum capacitance