Multi-sensing properties of hybrid filled natural rubber nanocomposites using impedance spectroscopy

Author(s)

Barbosa, Rafael ; Goncalves, Roger ; Blanco, Guilherme Eduardo de Oliveira ; Saccardo, Matheus Colovati ; Tozzi, Kaique Afonso ; Zuquello, Ariel Gustavo ; Scuracchio, Carlos Henrique

• Document type: Journal article
• Source: Electrochimica Acta; v. 435, p. 11-pg., 2022-10-22.

Abstract

In this work, natural rubber nanocomposites filled with carbon black and carbon nanotubes were prepared via latex mixing, and their applicability as multisensory devices were analyzed through Electrochemical Impedance Spectroscopy (EIS). Static and cyclic strain sensing was performed until 300% strain and the piezoresistivity, piezo-impedance, and piezo-capacitance were evaluated. The results indicated that impedance magnitude could be used instead of calculated resistivity, especially in lower and medium strain ranges. In higher strains, the capacitive behavior turns predominant, and the piezo-capacitance becomes the ideal parameter to be measured providing higher sensitivities as the gage factor (GF) reaches similar to 41.82 in 300% strain. The solvent sensing also showed that piezo-capacitance is a better measure than piezo-impedance, with a quicker response time and greater sensibility. This study demonstrated that using EIS in strain and solvent sensing of rubber nanocomposites can offer more detailed information about complex transport mechanisms and improve the sensitivity, linearity, and response time of elastomeric sensors. (AU)

• FAPESP's process: 18/09761-8 - Study and development of ionic polymer/metal composites for application in actuators and sensors aiming low cost and high performance
• Grantee: Roger Gonçalves
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/07001-6 - Study and characterization of ionic conductive polymers used as artificial muscles: proposals for performance improvement
• Grantee: Carlos Henrique Scuracchio
• Support Opportunities: Regular Research Grants
• FAPESP's process: 20/10588-9 - Effect of metal electrode degradation on the electromechanical performance of actuators based on ionomeric polymer and metal composites
• Grantee: Marina de Sousa de Paula
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 20/02696-6 - Synthesis and characterization of artificial muscles based on SBS block copolymers with selective sulfonation of the phases
• Grantee: Matheus Colovati Saccardo
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 20/10839-1 - Study of the influence of the cation and relative humidity of the air in the electrical response of deformation sensors based on IPMC
• Grantee: Iago Cordeiro Santa Bárbara
• Support Opportunities: Scholarships in Brazil - Scientific Initiation