Non‐oxidized graphene/elastomer composite films for wearable strain and pressure sensors with ultra‐high flexibility and sensitivity

Meng, Qingshi; Liu, Zhiwen; Cai, Rui; Han, Sensen; Lu, Shaowei; Liu, Tianqing

doi:10.1002/pat.4760

Cited by 21 publications

(13 citation statements)

References 59 publications

(64 reference statements)

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“…Textile strain sensors can be divided into resistive, capacitive, piezoelectric, triboelectric, and optical (Fiber Bragg Grating) [ 98 ]. The resistive type is widely used in textile strain sensors because it holds the superiorities of large measurement range, simple device structure, and high sensitivity [ 99 ], which is also the main focus of this review. The performance of textile strain sensors is generally evaluated from the aspects of GF, sensing range, long-term stability, and response time [ 100 , 101 ].…”

Section: Performance Factorsmentioning

confidence: 99%

Review of Graphene-Based Textile Strain Sensors, with Emphasis on Structure Activity Relationship

Zhu

Wan

et al. 2021

Polymers

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Graphene-based textile strain sensors were reviewed in terms of their preparation methods, performance, and applications with particular attention on its forming method, the key properties (sensitivity, stability, sensing range and response time), and comparisons. Staple fiber strain sensors, staple and filament strain sensors, nonwoven fabric strain sensors, woven fabric strain sensors and knitted fabric strain sensors were summarized, respectively. (i) In general, graphene-based textile strain sensors can be obtained in two ways. One method is to prepare conductive textiles through spinning and weaving techniques, and the graphene worked as conductive filler. The other method is to deposit graphene-based materials on the surface of textiles, the graphene served as conductive coatings and colorants. (ii) The gauge factor (GF) value of sensor refers to its mechanical and electromechanical properties, which are the key evaluation indicators. We found the absolute value of GF of graphene-based textile strain sensor could be roughly divided into two trends according to its structural changes. Firstly, in the recoverable deformation stage, GF usually decreased with the increase of strain. Secondly, in the unrecoverable deformation stage, GF usually increased with the increase of strain. (iii) The main challenge of graphene-based textile strain sensors was that their application capacity received limited studies. Most of current studies only discussed washability, seldomly involving the impact of other environmental factors, including friction, PH, etc. Based on these developments, this work was done to provide some merit to references and guidelines for the progress of future research on flexible and wearable electronics.

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Section: Performance Factorsmentioning

confidence: 99%

Review of Graphene-Based Textile Strain Sensors, with Emphasis on Structure Activity Relationship

Zhu

Wan

et al. 2021

Polymers

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“…The structural failure of nanocomposites is a complicated process, including the reduction of structural integrity in microscale. [32][33][34][35] The fracture morphology of CT specimen indicates important information for the toughening and fracture mechanisms of the composite, it was studied via SEM. The fractographs are shown in Figure 5.…”

Section: Morphology Analysismentioning

confidence: 99%

Development of high thermally conductive and electrically insulated epoxy nanocomposites with high mechanical performance

et al. 2021

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Developing polymer-based nanocomposites with high thermal conductivity, mechanical performance, and electrical insulation becomes a huge challenge in both academia and industry. In this article, the synergistic effects of boron nitride (BN) nanosheets and carbon nanotubes (CNTs) on mechanical properties and thermal conductivity of epoxy nanocomposite adhesives were investigated. The results showed that the addition of one-dimensional CNTs and two-dimensional BN nanosheets into the epoxy matrix contributes to the formation of a three-dimensional network and a larger contact surface between the nanofillers and the epoxy matrix. The hybrid filler of BN and CNTs provided significant improvements in thermal conductivity and mechanical properties of epoxy nanocomposite adhesives. At 1.06 vol% of BN-CNTs, epoxy nanocomposite adhesives provide higher Young's modulus, fracture toughness (K 1C ), energy release rate (G 1C ), lap shear strength, and thermal stability compared with epoxy/BN nanocomposite adhesives. The thermal conductivity of epoxy/BN-CNT nanocomposites recorded its maximum values of 0.49 K m À1 k À1 at 3.79 vol% and increased by 335% compared with 133% in case of epoxy/BN at the same fraction of 3.79 vol%.

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“…22,23 Carbon nanotube sponge has been widely studied as an electrode material and a flexible sensor of supercapacitor. 24,25 The sponge porous composite with graphene as the filler has strong electronic carrying capacity, 26,27 and its capacitance performance has been widely studied. 28,29 Graphene oxide has many functional groups containing oxygen and hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Nanocarbon-Based Flexible Multifunctional Composite Electrodes

Tian

Cai

et al. 2021

ACS Omega

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Although nanocarbon-based nanofillers have been widely used to improve the energy-storing and sensing functions of porous materials, the comparison of the effects of different nanocarbon-based fillers on the capacitive and flexible sensing properties of nanocarbon-based porous sponge composite supercapacitor electrodes by combining a carbon nanotube, graphene, and graphene oxide with porous sponge is incomplete. The specific capacitance of carbon nanotube-based electrodes is 20.1 F/g. The specific capacitance of graphene-based electrodes is 26.7 F/g. The specific capacitance of graphene oxide-based electrodes is 78.1 F/g, and the capacity retention rate is 92.99% under 20 000 charge−discharge cycles. Under a bending load of 180°, the capacitance retention rate of graphene oxide sponge composite electrodes is 67.46%, which indicates that the prepared electrodes of supercapacitor have the advantages of high capacitance and good flexibility at the same time. To demonstrate their performance, an array of three graphene oxide supercapacitors in series was constructed, which could light up a red light-emitting diode (LED). The tensile strength of carbon nanotube sponge composite electrodes is 0.267 MPa, and the tensile linearity is 0.0169. The experimental results show that graphene oxide-based sponge composite supercapacitor electrodes have the best capacitance performance and carbon nanotube sponge composites have the most potential as a flexible sensor.

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Non‐oxidized graphene/elastomer composite films for wearable strain and pressure sensors with ultra‐high flexibility and sensitivity

Cited by 21 publications

References 59 publications

Review of Graphene-Based Textile Strain Sensors, with Emphasis on Structure Activity Relationship

Review of Graphene-Based Textile Strain Sensors, with Emphasis on Structure Activity Relationship

Development of high thermally conductive and electrically insulated epoxy nanocomposites with high mechanical performance

Comparative Study of Nanocarbon-Based Flexible Multifunctional Composite Electrodes

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