Fabrication and characterization of conductive poly(dimethylsiloxane)-carbon nanotube nanocomposites for potential microsensor applications

Akhtarian, Shiva; Veladi, Hadi; Aref, S. Mohammadi

doi:10.1108/sr-04-2017-0055

Cited by 6 publications

(5 citation statements)

References 22 publications

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“…When the weight ratio of CNT-PDMS achieved 6 wt%, the electrical conductivity of the CNT-PDMS composite tended to be satiated. In this CNT-PDMS composite made by the dry blending method, the sharp increase corresponded to percolation threshold which was 1–3 wt% (close to 2 wt%, which is consistent with the literature) [ 44 , 45 ]. Compared with carbon black and other metal particles, the CNT composite has the lower percolation threshold [ 46 ].…”

Section: Resultssupporting

confidence: 90%

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Optimized CNT-PDMS Flexible Composite for Attachable Health-Care Device

Wang

Shi

et al. 2020

Sensors

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The CNT-PDMS composite has been widely adopted in flexible devices due to its high elasticity, piezoresistivity, and biocompatibility. In a wide range of applications, CNT-PDMS composite sensors were used for resistive strain measurement. Accordingly, the percolation threshold 2%~4% of the CNT weight ratio in the CNT-PDMS composite was commonly selected, which is expected to achieve the optimized piezoresistive sensitivity. However, the linear range around the percolation threshold weight ratio (2%~4%) limits its application in a stable output of large strain (>20%). Therefore, comprehensive understanding of the electromechanical, mechanical, and electrical properties for the CNT-PDMS composite with different CNT weight ratios was expected. In this paper, a systematic study was conducted on the piezoresistivity, Young’s modulus, conductivity, impedance, and the cross-section morphology of different CNT weight ratios (1 to 10 wt%) of the CNT-PDMS composite material. It was experimentally observed that the piezo-resistive sensitivity of CNT-PDMS negatively correlated with the increase in the CNT weight ratio. However, the electrical conductivity, Young’s modulus, tensile strength, and the linear range of piezoresistive response of the CNT-PDMS composite positively correlated with the increase in CNT weight ratio. Furthermore, the mechanism of these phenomena was analyzed through the cross-section morphology of the CNT-PDMS composite material by using SEM imaging. From this analysis, a guideline was proposed for large strain (40%) measurement applications (e.g., motion monitoring of the human body of the finger, arm, foot, etc.), the CNT weight ratio 8 wt% was suggested to achieve the best piezoresistive sensitivity in the linear range.

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Section: Resultssupporting

confidence: 90%

“…The CNT-PDMS composites with a weight ratio from 8 to 10 wt% were similar to the gel without fluidity. By using the fabrication process of screen printing and casting, CNT-PDMS composites (weight ratio 8%~10%) can be used as flexible strain sensors [ 15 , 38 , 44 , 52 ].…”

Section: Resultsmentioning

confidence: 99%

Optimized CNT-PDMS Flexible Composite for Attachable Health-Care Device

Wang

Shi

et al. 2020

Sensors

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“…In Figure 2, the electrical conductivity of MWCNTs/PDMS composite film was tested at the ratio of 2 wt%. This ratio was the percolation threshold for the MWCNTs/PDMS composites in this article 64,65 . Before the ratio reaching the percolation threshold, electrical conductivity of the film was hard to be tested.…”

Section: Resultsmentioning

confidence: 99%

“…This ratio was the percolation threshold for the MWCNTs/PDMS composites in this article. 64,65 Before the ratio reaching the percolation threshold, electrical conductivity of the film was hard to be tested. When MWCNTs ratio increased from 2 to 5 wt%, the electrical conductivity improved quickly, stating that a conductive MWCNTs network was formed inside the PDMS.…”

Section: Characterizationsmentioning

confidence: 99%

Thin and high conductive multi‐walled carbon nanotubes/polydimethylsiloxane composite film prepared via solvent method as strain sensors

Fu,

Wang,

Zhong

et al. 2024

Polymers for Advanced Techs

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Flexible strain sensors based on conductive fillers and flexible polymers possessed significant advantages in human motion detection. Preparing a strain sensing layer with high electrical conductivity and excellent mechanical property under high content of conductive filler contributed to the stability of flexible strain sensors. In this study, MWCNTs/PDMS composite film was prepared by the organic solvent method. The microstructure, electrical conductivity, mechanical property, and piezoresistive characteristics of the composite film at different MWCNTs contents were characterized and discussed. When the mass fraction of MWCNTs in the composite film was 5%, the composite film exhibited a high electrical conductivity of 9.56 S/m while maintaining ideal mechanical properties, and the film thickness was just about 180 μm. The relationship between electrical signals and film strain was performed. The piezoresistive characteristic results demonstrated that the prepared composite film could be used as flexible strain sensor for human motion detection. The prepared thin MWCNTs/PDMS composite film in this paper illustrated high conductive and desired flexibility, and was an alternative material for human motion detection.

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“…Polydimethylsiloxane (PDMS) is usually adopted as the protective matrix in the FSRS for its intrinsic stretchability, flexibility, biocompatibility, high thermal stability, oxidation stability, and optical transparency [27]. PDMS is not conductive, so it is usually filled with metal [28], carbon [25,29], and other particles [30] to prepare the conductive silicone rubbers (CSRs), which is a good candidate for CSM in the FSRS as its good compatibility with the encapsulation layer.…”

Section: Introductionmentioning

confidence: 99%

An embedded printed flexible strain resistance sensor via micro-structure design on graphene-filled conductive silicon rubber

luo¹,

Xia²,

Zhou³

et al. 2022

Smart Mater. Struct.

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Flexible sensors with multifunction are tremendously attractive with the assistance of materials design, novel manufacturing, as well as microstructure fabrication. In this study, graphene was efficiently dispersed in a solvent and filled into silicon rubber (SR), which was forward embedded-printed as a flexible strain resistance sensor (FSRS) with functional macrostructure and modified microstructure. Comprehensively considering the environmental protection of dispersion solvent and the cost of surfactants, a stable dispersion of graphene was established in an ultrasound-aided ball milling process, where absolute ethanol was selected as the solvent and sodium dodecyl sulfonate (SDS) as the surfactant. The printed pattern of graphene-filled conductive silicon rubber (CSR) was optimized and embedded-printed as the conductive sensitive material (CSM), in which the FSRS with a spiral-patterned CSM was chosen for its high sensitivity. Micropores with an optimized interspacing of 10 mm were further introduced into the spiral CSM to significantly improve the sensitivity (GF=51±4) of the fabricated FSRS at a considerable working strain (20~30%) and long-life working duration (>104 cycles). The FRSR was sensitive enough to capture various motions of single and multi-joints and identify the rhythm of played music, which exhibited its potential application as a wearable flexible sensor.

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Fabrication and characterization of conductive poly(dimethylsiloxane)-carbon nanotube nanocomposites for potential microsensor applications

Cited by 6 publications

References 22 publications

Optimized CNT-PDMS Flexible Composite for Attachable Health-Care Device

Optimized CNT-PDMS Flexible Composite for Attachable Health-Care Device

Thin and high conductive multi‐walled carbon nanotubes/polydimethylsiloxane composite film prepared via solvent method as strain sensors

An embedded printed flexible strain resistance sensor via micro-structure design on graphene-filled conductive silicon rubber

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