Measuring quantum conductance and capacitance of graphene using impedance-derived capacitance spectroscopy

Autor(es)

Lopes, Lais C. ^[1] ; Santos, Adriano ^[1] ; Bueno, Paulo R. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Inst Chem, BR-14800060 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Carbon; v. 184, p. 821-827, OCT 30 2021.
• Citações Web of Science: 0

Resumo

Here, we demonstrate that impedance-derived capacitance spectroscopy is a useful method for measuring and analyzing the quantum of conductance and capacitance of a single-layer graphene sheet. Both quantum conductance and capacitance exhibit the expected traditional V-shape when measured as a function of bias potential (with the minima of both parameters being at the Dirac point) in a 1-Butyl-3methylimidazolium tetrafluoroborate ionic liquid environment. Measurements were conducted at a specific low-frequency limit in which the conductance and capacitance were scanned as a function of bias potential to attain the quantum conductive and capacitive V-shapes. The V-shapes agree in terms of magnitude and profile with those reported in the literature using different methodologies and/or techniques. This validates impedance-derived capacitance spectroscopy as a suitable method to acquire key information of graphene and its derivatives. This method represents an alternative for rapid construction of both conductive and capacitive V-shapes of graphene in a single, simple experimental run. (c) 2021 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 18/23577-5 - Eletrônica e Eletroquímica em Escala Nanométrica: Fundamentos e Aplicações
• Beneficiário: Lais Cristine Lopes
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado