Higher Electrical Conductivity of Functionalized Graphene Oxide Doped with Silver and Copper (II) Ions

Nelson Gustavo Alves Pereira, Maria Elena Leyva Gonzaléz, Alvaro Antonio Alencar de Queiroz, Adhimar Flávio Oliveira () and Estácio Tavares Wanderley Neto
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Nelson Gustavo Alves Pereira: Instituto de Física e Química, Universidade Federal de Itajubá, Av BPS, 1303, Pinheirinho, Itajubá 37500-903, Brazil
Maria Elena Leyva Gonzaléz: Instituto de Física e Química, Universidade Federal de Itajubá, Av BPS, 1303, Pinheirinho, Itajubá 37500-903, Brazil
Alvaro Antonio Alencar de Queiroz: Instituto de Pesquisas Energéticas e Nucleares (IPEN), University of São Paulo, Cidade Universitária Armando de Salles Oliveira, São Paulo 05508-000, Brazil
Adhimar Flávio Oliveira: Instituto de Física e Química, Universidade Federal de Itajubá, Av BPS, 1303, Pinheirinho, Itajubá 37500-903, Brazil
Estácio Tavares Wanderley Neto: Instituto de Sistemas Elétricos e Energia, Universidade Federal de Itajubá, Av BPS, 1303, Pinheirinho, Itajubá 37500-903, Brazil

Energies, 2023, vol. 16, issue 20, 1-16

Abstract: This study presents a new methodology for graphene oxide (GO) synthesis through electrochemical exfoliation of graphite, followed by phthalic anhydride functionalization (PhA-GO) and doping with Cu 2 + and Ag + ions. The synthesis of GO involved the use of an electrochemical cell with H 2 SO 4 as the electrolyte, with a gradual increase in potential from 2.3 V to 10 V. Extensive characterization techniques confirmed the successful incorporation of oxygen-containing functional groups, verifying the oxidation of graphite. PhA-GO functionalization was confirmed by thermogravimetric analysis, Differential Scanning Calorimetry, Fourier-transform infrared spectroscopy (FTIR), UV-Vis spectroscopy, X-ray diffraction, scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDX), which confirmed the presence of Cu 2 + and Ag + ions. The Scherrer equation determined a grain size of 75.85 nm for GO. The electrical properties exhibited semiconductor and semimetal behavior, particularly in PhA-GO/Ag + composites, making them suitable for electronic devices over a wide temperature range, presenting a promising pathway for advanced materials in electronic applications.

Keywords: graphene oxide; electrochemical exfoliation; functionalization; doping; electric conductivity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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