Dispersion Stability and Surface Morphology Study of Electrochemically Exfoliated Bilayer Graphene Oxide
Journal article, 2019

During the last decade, electrochemical exfoliation of graphite has aroused great interest from both academia and industry for mass production of graphene sheets. Electrochemically exfoliated graphene oxide (EGO) features a much better tunability than chemically EGO, or even than graphene obtained with ultrasonic exfoliation. Chemical and electrical properties of EGO can be modified extensively, thanks to its step-controllable oxidation process, varying the electrolytes and/or the applied potential. It is thus possible, using tunable electrochemical oxidation, to produce low-defect EGO sheets, featuring both good electric conductivity and good dispersibility in common solvents (e.g., acetonitrile or isopropanol). This greatly facilitates its application in several fields, for example, in flexible electronics. In this work, we correlate the dispersion behavior of EGO with its chemical properties using the relative Hansen solubility parameter, zeta potential values, X-ray photoemission spectroscopy, and Raman analysis. A surface morphology study by atomic force microscopy and transmission electron microscopy analyses also reveals that EGO sheets are multiple structures of (partially oxidized) graphene bilayers. Conductive EGO films could be easily prepared by vacuum filtration on different substrates, obtaining electrical conductivity values of up to ∼104 S/m with no need for further reduction procedures.

Author

Zhenyuan Xia

Chalmers, Industrial and Materials Science, Materials and manufacture

Istituto per la Sintesi Organica e la Fotoreattività

Giulio Maccaferri

Universita Degli Studi Di Modena E Reggio Emilia

Istituto per la Sintesi Organica e la Fotoreattività

Chiara Zanardi

Universita Degli Studi Di Modena E Reggio Emilia

Istituto per la Sintesi Organica e la Fotoreattività

Meganne Christian

Institute for Microelectronics and Microsystems

Luca Ortolani

Institute for Microelectronics and Microsystems

V. Morandi

Institute for Microelectronics and Microsystems

Vittorio Bellani

Universita degli studi di Pavia

Alessandro Kovtun

Istituto per la Sintesi Organica e la Fotoreattività

Simone Dell'Elce

Istituto per la Sintesi Organica e la Fotoreattività

Andrea Candini

Istituto per la Sintesi Organica e la Fotoreattività

A. Liscio

Institute for Microelectronics and Microsystems

Istituto per la Sintesi Organica e la Fotoreattività

Vincenzo Palermo

Chalmers, Industrial and Materials Science, Materials and manufacture

Istituto per la Sintesi Organica e la Fotoreattività

Journal of Physical Chemistry C

1932-7447 (ISSN) 1932-7455 (eISSN)

Vol. 123 24 15122-15130

Janus-like, Asymmetric graphene Nanosheets for Ultrafiltration and Sieving.

Swedish Research Council (VR), 2018-01-01 -- 2021-12-31.

Subject Categories

Inorganic Chemistry

Physical Chemistry

Other Physics Topics

Areas of Advance

Materials Science

DOI

10.1021/acs.jpcc.9b03395

More information

Latest update

7/17/2019