Physicochemical characterization of a low-oxygen composite based on chitosan and electrochemically exfoliated graphene

Author(s)

de Arruda, Milena Nakagawa ; Palley, Bianca Fortes ; de Souza, Gustavo Freitas ; Lopez, Ligia ; Pontes, Marcelo Andre Petry ; Fernandes, Willians Principe ; Gandara, Meriene ; Machado, Francisco Bolivar Correto ; Ferrao, Luiz Fernando de Araujo ; Goncalves, Emerson Sarmento

• Document type: Journal article
• Source: Materials Chemistry and Physics; v. 306, p. 10-pg., 2023-06-16.

Abstract

Chitosan and graphene composites are widely used as biological scaffolds. Aside from environmental concerns related to the Hummer's synthesis the composite obtained contains significant amounts of oxygen and other residues, besides the agglomerate formation. In this work, a few-layer graphene obtained by electrochemically exfoliation of graphite was designed and made up with chitosan forming a uniform composite showing a low oxygen content. The amide group formation and crystallographic data were used as an index of composite dispersion. Electrochemically exfoliated graphene presented higher crystallinity degree and uniform crystallite size conferring a homogeneous dispersion of the nanofiller in the chitosan matrix. Chemical interactions between the electrochemically exfoliated graphene and chitosan allowed a high carbon C/O ratio of 14.63 shown by XPS analysis, which gives the high conductivity value, desirable for several purposes. (AU)

• FAPESP's process: 22/16385-8 - Organic light emitting devices, energy converters via singlet fission and 0D/0D hybrid materials for hydrogen production: computational chemistry approach
• Grantee: Francisco Bolivar Correto Machado
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/17661-0 - Obtainment of reduced graphene oxide to sensor systems of aerospace industry
• Grantee: Emerson Sarmento Gonçalves
• Support Opportunities: Regular Research Grants
• FAPESP's process: 22/02737-0 - Development of supercapacitor devices from 2D and 3D nanomaterial electrodes: graphene, MXenes and metal nanooxides
• Grantee: Emerson Sarmento Gonçalves
• Support Opportunities: Regular Research Grants
• FAPESP's process: 22/02347-7 - New technologies for supercapacitors and lithium-ion batteries from rare earth-doped MXenes
• Grantee: Meriene Gandara
• Support Opportunities: Scholarships in Brazil - Doctorate