Investigations of the relationships between structure and electrochemical properties of fullerenol nanoaggregates

Author(s)

Damasceno, Paulo Vita ; Wachholz Jr, Dagwin ; Marques, Felipe Barbosa ; Kubota, Lauro Tatsuo

• Document type: Journal article
• Source: Electrochimica Acta; v. 483, p. 11-pg., 2024-03-03.

Abstract

Hybrid materials containing fullerenols have been used as electrodes in many applications, such as electrochemical biosensors for different targets or in hydrogen and oxygen reduction reactions. However, electrodes modified with fullerenols and without other electroactive materials are not much explored, and the electrochemical behavior of fullerenols themselves is not well-established in the literature. Herein, we report the basic electrochemical characterization of electrode modified with fullerenol and some correlations between material structure and electrochemical behavior. The prepared fullerenol is composed of nanoaggregates dispersed in an organic solvent. Although the electrode modified with pristine fullerene is slightly less active to [Fe(CN)6]3- /4concerning bare glassy carbon electrode (GCE), the fullerenol-based electrode presents a much lower activity that is slightly increased after electrochemical reduction. The drying process greatly influences the electrochemical performance of the electrodes modified with fullerenol, and fast drying can form ruptures with micrometric dimensions that provide a particular behavior towards the anionic probe. The reduction process increases the number and sizes of these ruptures and changes the electrochemical response. Moreover, the fullerenol-based electrode is more active for [Ru(NH3)6]3+ than the bare GCE, and the activity was increased after reduction. However, the electrochemical response to the cationic probe is characteristic of macroelectrodes regardless of the drying process or reduction. This work opens new perspectives in the electrochemical studies of modified carbon nanomaterials, with the possibility of producing carbon-based electrodes selective to charged probes by controlling the carbon materials' molecular and microscale structures. (AU)

• FAPESP's process: 13/22127-2 - Development of novel materials strategic for integrated analytical devices
• Grantee: Lauro Tatsuo Kubota
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 22/11401-5 - Preparation of conducting ink of carbon nanomaterials without surface passivating to the disposable and flexible electrodes fabrication
• Grantee: Felipe Barbosa Marques
• Support Opportunities: Scholarships in Brazil - Program to Stimulate Scientific Vocations
• FAPESP's process: 14/50867-3 - INCT 2014: National Institute of Science and Technology in Bioanalysis
• Grantee: Marco Aurelio Zezzi Arruda
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 21/09706-0 - Development of a CRISPR/Cas-based electrochemical biosensor for T-Cell Leukemia virus (HTLV-1) and Staphylococcus Aureus bacteria detection with point-of-care devices
• Grantee: Dagwin Wachholz Júnior
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 22/05053-4 - Preparation of carbon-based conductive inks for printed electronic devices
• Grantee: João Paulo Vita Damasceno
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 20/06604-9 - Conductive inks based on carbon nanomaterials for the preparation of electrodes applied to electrochemical devices
• Grantee: João Paulo Vita Damasceno
• Support Opportunities: Scholarships in Brazil - Post-Doctoral