A multilayered flexible piezoresistive sensor for wide-ranged pressure measurement based on CNTs/CB/SR composite

Abstract

To optimize the structure of the flexible piezoresistive sensor based on conductive polymer composite and widen the workable pressure range, a piezoresistive sensor with a multilayered structure based on carbon nanotubes/carbon black/silicone rubber conductive composite was designed and investigated. Different from the traditional monolayer structure, this novel multilayered sensor consisted of three microstructured piezoresistive composite films. The experimental data showed that the electrical resistance of the sensor varied regularly with a wide range of applied pressure (0-1.8 MPa at least). The high sensitivity, high flexibility, facile fabrication, and low cost were also the advantages of this pressure sensor. In addition, the piezoresistive mechanism was studied and shown to be the synergistic effects of the contact resistance mechanism and bulk resistance mechanism. Factors influencing the piezoresistive properties were also investigated. Moreover, the consecutive loading tests verified the feasibility and stability to use this sensor element for pressure measurement.

Compressive capacitance relaxation of carbon black filled silicone rubber composite

“…After 60 hr, the mixture is directly vulcanized between the bottom and the top electrodes to complete the sandwich element based on the composite. This method can realize the good contact between the composite and the electrode which has been verified by the previous researches . The schematic for the sandwich element and the measurement method is shown in Fig.…”

Pressure-sensitive properties of carbon nanotubes/bismuth sulfide composite materials

“…The porosity in the structure suggests that CNT/Bi 2 S 3 composite is a good candidate for pressure sensing studies. 11 The reason is the material densification, that is, increase in pressure results in a decrease in porosity due to the reduction of the inter-planar distance between nanoparticles of the materials. 11 It is quite clear from Figure 6(a) and (b) that the mergence among the nanoparticles within CNT and Bi 2 S 3 samples is comparatively more than CNT/Bi 2 S 3 compositebased sample (Figure 6(c)).…”

“…An appreciable amount of research work on this topic can be found in the available literature. 5,6,[10][11][12][13][14] Recently, Hasan et al demonstrated multi-walled carbon nanotubes/ polydimethylsiloxane (MWCNT/PDMS) composite piezoresistive pressure sensors. For all types of MWCNT/PDMS composite-based pressure sensors, a decrease in resistance with increase in pressure was observed.…”

Electrical conductivity transformation mechanism of GNPs/CB/SR nanocomposite foams

“…It seems reasonable to expect that, with all these unique structural, mechanical, and electrical properties mentioned above, the utilization of carbonic composites as conductive fillers in foams could provide excellent advantages . Meanwhile, the synergistic conductive network of binary conductive fillers could significantly enhance the conductivity of composites in our previous researches …”