Piezo-resistance effect in composite based on cross-linked polydimethylsiloxane and polyaniline: potential pressure sensor application

Castillo-Castro, T. del; Castillo‐Ortega, M. M.; Encinas, José Carmelo; Herrera‐Franco, Pedro J.; Carrillo-Escalante, Hugo Joel

doi:10.1007/s10853-011-5965-y

Cited by 23 publications

(26 citation statements)

References 31 publications

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“…Overall, the morphology analysis revealed voids in the cross sections of the composites; these discontinuities have been observed previously for samples of PANI‐containing and CNT‐containing polymer composites …”

Section: Resultssupporting

confidence: 81%

“…Instead of occurring at 2.5 and 5% PANI, some disconnections of CNT bundles by PANI domains occurred when the concentration of conductive polymer reached 7.5%; this hindered the flow of the main charge carriers through the composite. It is important to highlight the fact that the bulk conductivity of the PDMS–PANI composites was previously studied by our research group, and the PANI weight contents used in this study were below its percolation threshold (11.5%) in the PDMS–PANI composite …”

Section: Resultsmentioning

confidence: 88%

“…developed an inexpensive and flexible strain sensor by synthesizing a two‐dimensional porous PANI nanostructure embedded in a flexible polydimethylsiloxane (PDMS) matrix. Previously, our research group studied the piezoresistive response of PDMS–PANI composites prepared by the chemical reticulation of PDMS in the presence of PANI particles as a function of their composition.…”

Section: Introductionmentioning

confidence: 99%

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Electrical, mechanical, and piezoresistive properties of carbon nanotube–polyaniline hybrid filled polydimethylsiloxane composites

Egurrola

Castillo-Castro

Castillo‐Ortega

et al. 2017

J of Applied Polymer Sci

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The electrical, mechanical, and piezoresistive properties of ternary composites based on elastomeric polydimethylsiloxane (PDMS), carbon nanotubes (CNTs), and polyaniline (PANI) were studied and compared with those of binary PDMS-CNT composites. The presence of PANI affected the percolating network of the CNTs. At lower PANI concentrations (2.5 and 5%), the conductive network of the CNTs was constructively modified; this led to an enhancement in the conductivity in the sample containing 2% CNTs. A higher PANI content (7.5%) hindered the flow of main charge carriers through the composite. The piezoresistive response of the binary and ternary composites was studied by cyclic experiments under compression loads. In all of the samples, the electrical resistance increased monotonically up to a 10% strain. The reproducibility of the piezoresistive behavior in the binary and ternary composites provided evidence that the fillers could reversibly recover their initial position together with the PDMS chains without a significant displacement with respect to their original positions. The reduction of the piezoresistive sensibility by PANI addition was attributed to the displacement restrictions of the CNTs within the composite under pressure because of the volume exclusion of PANI particles; this maintained the probability of CNT contact and increased the possibility of the formation of new CNT conductive channels.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Electrical, mechanical, and piezoresistive properties of carbon nanotube–polyaniline hybrid filled polydimethylsiloxane composites

Egurrola

Castillo-Castro

Castillo‐Ortega

et al. 2017

J of Applied Polymer Sci

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“…The size of each polyaniline rectangular prism was 3.5 mm × 3.5 mm × 2.5 mm, and the distance between the centers of each element was 9 mm. The unwired-sensor was weighted before the thermal treatment of 165 • C for 5 min on a covered hot plate [9]. After each PANI element was treated with a thermal doping, it needed to be wired.…”

Section: Design and Fabricationmentioning

confidence: 99%

“…This feature, in addition to its low-cost, ease of synthesis and good environmental stability, suggests that PANI is a plausible candidate for the fabrication of piezoresistive sensors [4][5][6][7][8]. However, the use of this polymer for the manufacture of sensors based on its piezoresistive properties deserves further investigation [9].…”

Section: Introductionmentioning

confidence: 99%

Embedded Conjugated Polymer Sensor Arrays for Load Transmission Measurement in Orthopaedic Implants

Micolini¹,

Holness²,

Johnson³

et al. 2017

Preprint

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Load transfer through orthopaedic joint implants is poorly understood. The longer-term outcomes of these implants are just starting to be studied, making it imperative to monitor contact loads across the entire joint implant interface to elucidate the force transmission and distribution mechanisms exhibited by these implants in service. This study proposes and demonstrates the design, implementation, and characterization of a 3D-printed smart polymer sensor array using conductive polyaniline (PANI) structures embedded within a polymeric parent phase. The piezoresistive characteristics of PANI were studied to characterize the sensing behaviours inherent to these embedded pressure sensor arrays. PANI's stable response to a continuous load, its stability throughout loading and unloading cycles, and its repeatable and linear response to incremental loading cycles together with the accuracy of these measurements were investigated. It is demonstrated that this specially developed multi-material additive manufacturing process for polyaniline is an attractive approach for the fabrication of implant components having embedded smart-polymer sensors for the measurement and analysis of joint loads in orthopaedic implants.

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Polyaniline, ethylene vinyl acetate semi‐conductive composites as pressure sensitive sensor

Rahaman

Chaki

Khastgir

2012

J of Applied Polymer Sci

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This study focuses on the pressure sensitivity of ethylene vinyl acetate (EVA)/polyaniline (Pani) composites prepared through in situ polymerization of aniline in solutions of insulating EVA matrix. It is found that both DC and AC resistivity of the composites decreases with the increase in Pani concentration. The investigation shows that the composites senses to applied pressure through the decrease in resistivity with the increase in applied pressure. Moreover, the pressure sensitivity is also effective when the composites are kept under constant load for a period of time. Both DC and AC resistivity are found to decrease exponentially with respect to time. Relaxation time for the composites has been calculated and found that more time is required to be relaxed for the composite with lower Pani content. However, the composite with lower Pani content exhibits relatively higher change in electrical properties when subjected to both the applied pressure and time. The results show that these composites can be used as pressure sensitive sensor.

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Piezo-resistance effect in composite based on cross-linked polydimethylsiloxane and polyaniline: potential pressure sensor application

Cited by 23 publications

References 31 publications

Electrical, mechanical, and piezoresistive properties of carbon nanotube–polyaniline hybrid filled polydimethylsiloxane composites

Electrical, mechanical, and piezoresistive properties of carbon nanotube–polyaniline hybrid filled polydimethylsiloxane composites

Embedded Conjugated Polymer Sensor Arrays for Load Transmission Measurement in Orthopaedic Implants

Polyaniline, ethylene vinyl acetate semi‐conductive composites as pressure sensitive sensor

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