Coupled Effects of Film Thickness and Filler Length on Conductivity and Strain Sensitivity of Carbon Nanotube/Polymer Composite Thin Films

Rahman, Rubaiya; Soltanian, Saeid; Servati, Peyman

doi:10.1109/jsen.2015.2478447

Cited by 10 publications

(5 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although CNT-based strain sensors can be designed to possess unique properties (e.g., high sensitivity), their piezoresistivity is affected by CNTs' intrinsic characteristics (e.g., length [33], type [34], and alignment [35]) and other extrinsic properties such as the polymer matrix [36], fabrication procedure [23], curing temperature [26], and sonication [29]. As a result, analytical methods were used to better understand the relationship between the nano-scale features of thin film constituents and their bulk electrical and electromechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Carbon nanotube thin film strain sensors: comparison between experimental tests and numerical simulations

Lee¹,

Loh²

2017

Nanotechnology

View full text Add to dashboard Cite

Carbon nanotubes can be randomly deposited in polymer thin film matrices to form nanocomposite strain sensors. However, a computational framework that enables the direct design of these nanocomposite thin films is still lacking. The objective of this study is to derive an experimentally validated and two-dimensional numerical model of carbon nanotube-based thin film strain sensors. This study consisted of two parts. First, multi-walled carbon nanotube (MWCNT)-Pluronic strain sensors were fabricated using vacuum filtration, and their physical, electrical, and electromechanical properties were evaluated. Second, scanning electron microscope images of the films were used for identifying topological features of the percolated MWCNT network, where the information obtained was then utilized for developing the numerical model. Validation of the numerical model was achieved by ensuring that the area ratios (of MWCNTs relative to the polymer matrix) were equivalent for both the experimental and modeled cases. Strain sensing behavior of the percolation-based model was simulated and then compared to experimental test results.

show abstract

Section: Introductionmentioning

confidence: 99%

Carbon nanotube thin film strain sensors: comparison between experimental tests and numerical simulations

Lee¹,

Loh²

2017

Nanotechnology

View full text Add to dashboard Cite

show abstract

“…[ 53 ] It has also been demonstrated that in the case of composites, decreasing sheet thickness resulted in an increased average distance between dispersed conductive particulates. [ 54 ] This loss in network interconnectivity limits formation of conductive pathways, moving the conductive network away from the percolation threshold, further contributing to a decrease in material conductivity. These results suggest that, in addition to network percolation, the conductivity of conductive composites relies heavily on the overall thickness of the cast material.…”

Section: Resultsmentioning

confidence: 99%

Stretchable, Fully Polymeric Electrode Arrays for Peripheral Nerve Stimulation

et al. 2021

View full text Add to dashboard Cite

There is a critical need to transition research level flexible polymer bioelectronics toward the clinic by demonstrating both reliability in fabrication and stable device performance. Conductive elastomers (CEs) are composites of conductive polymers in elastomeric matrices that provide both flexibility and enhanced electrochemical properties compared to conventional metallic electrodes. This work focuses on the development of nerve cuff devices and the assessment of the device functionality at each development stage, from CE material to fully polymeric electrode arrays. Two device types are fabricated by laser machining of a thick and thin CE sheet variant on an insulative polydimethylsiloxane substrate and lamination into tubing to produce pre-curled cuffs. Device performance and stability following sterilization and mechanical loading are compared to a state-of-the-art stretchable metallic nerve cuff. The CE cuffs are found to be electrically and mechanically stable with improved charge transfer properties compared to the commercial cuff. All devices are applied to an ex vivo whole sciatic nerve and shown to be functional, with the CE cuffs demonstrating superior charge transfer and electrochemical safety in the biological environment.

show abstract

Section: Structural Design Of Strain Sensormentioning

confidence: 99%

“…Randomly arranged CNT films possess excellent sensitivity, while the sensing performance of the films is facilitated by tuning the thickness and density of the CNTs. [156] Xu et al conducted a theoretical study on ultrathin CNT films with different densities, and reduced the density of CNTs from 152 to 7.2 µm −2 , which significantly increased the GF from 0.4 to 50. [62] Roh investigated a novel sandwich-like stacked SWCNTs nanohybrid film and PU polyester (3,4-ethylenedioxythiophenyl) polystyrene sulfonate (PEDOT: PSS) conductive elastic composite.…”

Section: Film Strain Sensorsmentioning

confidence: 99%

Carbon Nanotube‐Based Strain Sensors: Structures, Fabrication, and Applications

Wang

Zhu

et al. 2022

Adv Materials Technologies

View full text Add to dashboard Cite

flexible devices has received widespread attention. Among them, flexible strain sensors have attracted great interest from the industry and academia due to their promising applications in wearable devices, [1][2][3] electronic skin, [4,5] intelligent robots, [6] healthcare monitoring, [7] and humanmachine interfaces. [8,9] The three primary categories of strain sensors are resistive, [10] capacitive, [11] and piezoelectric. [12] The advantages of capacitive-type strain sensors are high sensitivity, rapid response, and high linearity, but the sensor has poor response performance on various strains due to their structural limitations. The performance of the piezoelectric-type strain sensor mainly focuses on the piezoelectric material, which requires excellent piezoelectricity of the material, but the piezoelectric material is more expensive and the measurable range is narrower. Compared to the above two types of sensors, resistivetype strain sensors have the advantages of a wider strain sensing range, relatively simple reading mechanism and easy fabrication, which have received wide attention in recent years in the fields of wearable devices and electronic skins. Therefore, this paper will focus on the resistive-type strain sensors. The working principle is that the structure of the conductive material changes when the device is stretched, bent, and twisted, causing the resistance of Flexible strain sensors have received widespread attention because of their great potential in many fields. Carbon nanotubes (CNTs) have been used as conductive materials for flexible strain sensors due to their excellent electrical and mechanical properties, and the fabricated flexible strain sensors have excellent sensing performance. This paper systematically summarizes the advances in flexible resistance-type strain sensors based on CNTs. The strain sensing mechanisms are introduced, including crack extension, tunneling effect, and disconnection of overlapping materials. The performance parameters of the sensors, including sensitivity, stretchability, linearity, hysteresis, dynamic durability, and transparency, are discussed comprehensively. The coating methods, 3D printing techniques, chemical vapor deposition, transfer methods, and spinning processes used to fabricate CNT strain sensors are highlighted. The effect of isolated and porous internal conductive structures, folded and microcracked surface structures, films and fabrics macroscopic structures on sensor performance were systematically analyzed. The applications of the sensors in medical health, motion monitoring, gesture recognition, human-computer interaction, and soft robotics are provided in detail. Finally, the future challenges of CNT flexible strain sensors are summarized and the outlook is presented. Although CNT strain sensors have made great progress so far, there are still many problems that need researchers' attention and solutions.

show abstract

Coupled Effects of Film Thickness and Filler Length on Conductivity and Strain Sensitivity of Carbon Nanotube/Polymer Composite Thin Films

Cited by 10 publications

References 24 publications

Carbon nanotube thin film strain sensors: comparison between experimental tests and numerical simulations

Carbon nanotube thin film strain sensors: comparison between experimental tests and numerical simulations

Stretchable, Fully Polymeric Electrode Arrays for Peripheral Nerve Stimulation

Carbon Nanotube‐Based Strain Sensors: Structures, Fabrication, and Applications

Contact Info

Product

Resources

About