@Article{BragaVieAntDonCor:2022:EvCoPi,
               author = "Braga, Thyago Santos and Vieira, Nirton C. S. and Antonelli, 
                         Eduardo and Donadon, Mauricio and Corat, Evaldo Jos{\'e}",
          affiliation = "{Instituto Tecnol{\'o}gico da Aeron{\'a}utica (ITA)} and 
                         {Universidade Federal de S{\~a}o Paulo (UNIFESP)} and 
                         {Universidade Federal de S{\~a}o Paulo (UNIFESP)} and {Instituto 
                         Tecnol{\'o}gico da Aeron{\'a}utica (ITA)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Evaluation of conductivity and piezo-impedance response of 
                         VACNTs/PDMS nanocomposite-based strain sensors under small 
                         deformations",
              journal = "Sensors and Actuators A-Physical",
                 year = "2022",
               volume = "342",
                pages = "e113626",
                 note = "{Setores de Atividade: Pesquisa e desenvolvimento 
                         cient{\'{\i}}fico.}",
             keywords = "Carbon nanotubes, Sensor de deforma{\c{c}}{\~a}o, Vertically 
                         aligned multi-walled carbon nanotubes, Stretchable sensors, 
                         Tunneling effect, Dielectric impedance, Cut-off frequency.",
             abstract = "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 reduced fc 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.",
                  doi = "10.1016/j.sna.2022.113626",
                  url = "http://dx.doi.org/10.1016/j.sna.2022.113626",
                 issn = "0924-4247",
                label = "lattes: 0560039556461253 5 BragaVieAntDonCor:2022:EvCoPi",
             language = "en",
           targetfile = "Braga_2022_evaluation.pdf",
        urlaccessdate = "25 jun. 2024"
}