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Evaluation of conductivity and piezo-impedance response of VACNTs/PDMS nanocomposite-based strain sensors under small deformations

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Autor(es):
Braga, Thyago Santos ; Vieira, Nirton C. S. ; Antonelli, Eduardo ; Donadon, Mauricio Vicente ; Corat, Evaldo Jose
Número total de Autores: 5
Tipo de documento: Artigo Científico
Fonte: SENSORS AND ACTUATORS A-PHYSICAL; v. 342, p. 10-pg., 2022-08-01.
Resumo

The vertically aligned multi-walled carbon nanotubes (VACNTs) / polydimethylsiloxane (PDMS) nanocompositebased strain sensors presented in this study show different behavior depending on catalyst concentrations for VACNT growth. Under static tensile load, the sensor with lower catalyst concentration shows a high gauge factor (GF-1400), whereupon tunneling effect is the mechanism that dictates the sensitivity. For higher concentrations, the GF decreases (GF-40) and shows an ohmic conduction. Morphological examinations showed VACNTs are homogeneously and randomly distributed as clusters with CNT bridging in the PDMS polymer matrix. Based on dielectric impedance (DI) and direct current (DC) electrical analysis, it was possible to identify that cut-off frequency (fc) increases with VACNTs concentration. Cut-off frequency can also define high sensitivity VACNT sensors with lower VACNT density. When compared with dispersed MWCNT sensors, VACNTs have a reducedfc due to the larger internal resistance variation associated with the high tunneling effect. This effect associated with the high sensitivity of the VACNT/PDMs sensors makes it a key factor to understand the mechanisms responsible for increasing the sensitivity and manufacturing of high GF nanocomposite stretchable sensors. (AU)

Processo FAPESP: 19/18572-7 - Novos materiais de carbono: suas aplicações espaciais, ambientais e spin offs relevantes
Beneficiário:Evaldo Jose Corat
Modalidade de apoio: Auxílio à Pesquisa - Temático
Processo FAPESP: 18/07508-3 - Explorando as propriedades elétricas e ópticas de derivados de grafeno para detecção de cianotoxinas
Beneficiário:Nirton Cristi Silva Vieira
Modalidade de apoio: Auxílio à Pesquisa - Regular
Processo FAPESP: 12/15857-1 - Estudos científicos e aplicações inovadoras em diamante-CVD, Diamond-Like Carbon (DLC) e carbono nanoestruturado, obtidos por deposição química na fase vapor
Beneficiário:Vladimir Jesus Trava-Airoldi
Modalidade de apoio: Auxílio à Pesquisa - Temático