Strain Sensors with Adjustable Sensitivity by Tailoring the Microstructure of Graphene Aerogel/PDMS Nanocomposites

Wu, Shuying; Ladani, Raj B.; Zhang, Jin; Ghorbani, Kamran; Zhang, Xuehua; Mouritz, A.P.; Kinloch, A. J.; Wang, Chun H.

doi:10.1021/acsami.6b06012

Cited by 211 publications

(141 citation statements)

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“…Recent researches have demonstrated that the design of segregated electrically conductive network can significantly lower the percolation threshold and increase the electrical conductivity for a given weight percentage of conductive nanomaterials . The conductive network can be formed during the compounding or by infiltrating a preconstructed conductive network with the liquid polymer to generate highly conductive composites …”

Section: Materials Designsmentioning

confidence: 99%

Strategies for Designing Stretchable Strain Sensors and Conductors

Peng

et al. 2020

Adv Materials Technologies

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115

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Flexible and stretchable electronics are attracting tremendous attention for their enormous future potential in wearable technologies. Flexible and stretchable sensors and conductors are the key components of wearable devices for potential applications such as human motion detection, human health monitoring, and human–machine interfaces. One critical requirement for them is to show high level of wearability (bendability and stretchability) and meanwhile to retain their functionality and reliability under large mechanical deformation. To this end, a wide range of materials and structural designs are developed to construct these sensors and conductors. Here, the recent advances in the development of new piezoresistive materials and microstructural motifs that endow electronics with flexibility and stretchability are summarized. Challenges and future opportunities are discussed in terms of the multimodal and multidirectional sensing capabilities, the trade‐off between sensitivity/conductivity and stretchability, multifunctionality, linearity (multiple linear region phenomenon), and integration with flexible power and communication devices.

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Section: Materials Designsmentioning

confidence: 99%

Strategies for Designing Stretchable Strain Sensors and Conductors

Peng

et al. 2020

Adv Materials Technologies

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115

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“…Nanofillers (for example, CNFs and Fe/FeO) and polypropylene in xylene are heated to reflux (around 140°C for 2 h) to form a black colloid. For instance, infiltrating three-dimensional (3D) structured graphene with low viscous polymers [47] or coating graphene on polymer particle [48] or foam [49] template followed by heat treatment have been reported to prepare 3D graphene based PNCs. After the evaporation of the solvents, the obtained PNCs could be molded into different shapes for characterizations.…”

Section: Direct Compoundingmentioning

confidence: 99%

Multifunctions of Polymer Nanocomposites: Environmental Remediation, Electromagnetic Interference Shielding, And Sensing Applications

et al. 2020

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Polymer nanocomposites (PNCs), i. e. nanofillers dispersed in a polymer matrix, have become a prominent area of current research promoted by rapid developments in the polymer science and nanotechnology. As a promising alternative to conventional composites which are reinforced with micro-scale fillers, PNCs exhibit substantially improved overall performance and simplified processing at much lower nanofiller loadings. PNCs have great potentials for a broad range of applications, e. g. environmental remediation, energy storage/conversion, transportation, and national defense. In this regard, the most recent advances in PNCs for the environmental remediation, electromagnetic interference (EMI) shielding and sensing & actuation applications are presented. Challenges and perspectives of PNCs are also discussed. Polymer matrixesWith an almost unlimited selection of monomers, oligomers, and chemistries available, a myriad of polymer matrixes with tuned physiochemical properties (i. e. molecular structure, chemical stability, flame retardancy, abrasion resistance, transparency, and conductivity) for versatile applications can be designed. [9] For example, linear-structured thermoplastic polymers (i. e. polyethylene, polypropylene, polystyrene, poly(methyl methacrylate), polyvinyl chloride, polyamides, polyether sulfone, and polyetherether ketone) can be reshaped and recycled via various processing techniques such as injection molding, compression molding, and extrusion upon heating. Thermoplastic polymers find their wide applications such as drinking water bottles, grocery bags, household food covering, etc. [10] On the contrast, thermosetting polymers with three-dimensional network of bonds (i. e. epoxy, phenol-formaldehyde, ureaformaldehyde) cannot be melted or reshaped after curing, and are often featured with high mechanical strength and stiffness. [11] Therefore, thermosetting polymers are more suitable for high-temperature applications.[a] Dr.

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“…where ∆R is the resistance change of the sensor under strain, R 0 is the resistance prior to straining, and ε is the applied strain. The piezoresistivity can be mainly attributed to three mechanisms: (i) tunneling resistance change between adjacent nanoplatelets caused by microcracks, (ii) the influence of geometrical changes of the sensor components, and (iii) the piezoresitivity of individual nanoplatelets due to their deformation [33][34][35]. The resistance change (∆R/R 0 ) can be expressed as:…”

Section: Strain Sensor Fabrication and Propertiesmentioning

confidence: 99%

A Multifunctional Wearable Device with a Graphene/Silver Nanowire Nanocomposite for Highly Sensitive Strain Sensing and Drug Delivery

Shi

Liu

Kopecki

et al. 2019

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Advances in wearable, highly sensitive and multifunctional strain sensors open up new opportunities for the development of wearable human interface devices for various applications such as health monitoring, smart robotics and wearable therapy. Herein, we present a simple and cost-effective method to fabricate a multifunctional strain sensor consisting of a skin-mountable dry adhesive substrate, a robust sensing component and a transdermal drug delivery system. The sensor has high piezoresisitivity to monitor real-time signals from finger bending to ulnar pulse. A transdermal drug delivery system consisting of polylactic-co-glycolic acid nanoparticles and a chitosan matrix is integrated into the sensor and is able to release the nanoparticles into the stratum corneum at a depth of~60 µm. Our approach to the design of multifunctional strain sensors will lead to the development of cost-effective and well-integrated multifunctional wearable devices. C 2019, 5, 17 2 of 16the development of mobile devices where increasing functionalities are being integrated into single devices, multifunctional wearable devices [2,10,11] open new tech logical possibilities in areas such as human-machine interaction, health monitoring and drug delivery [12]. For example, a single device might be fabricated which can simultaneously deliver drugs and monitor the physiological response. Despite the clear promise of such multifunctional wearable devices, further improvements related to the fabrication process and cost-effectiveness are needed for their adoption.In terms of materials selection, there have been various approaches utilizing nanomaterials (e.g., silver nanowires [13], carbon nanotubes [14] and chemical vapor deposition (CVD) graphene [15]) as sensing components and elastomeric polymers or textiles as flexible and stretchable substrates [16,17]. Graphene nanoplatelets (GnPs) have been widely used in various polymer nanocomposites because of their superior electrical and mechanical properties [18][19][20]. Each GnP is typically 2-5 nm in thickness and may contain 3-10 graphene layers [21]. Upon reaching the percolation threshold in a matrix, the individual GnP forms a physically connected network where the overall resistance of the nanocomposites becomes limited by the interlayer contact resistance of the GnPs [4,22]. A strategy to reduce the contact resistance is to combine GnPs with silver nanowires (AgNWs). AgNWs employed in this work are around 40 nm in diameter and 20-60 µm in length. Under low strain, nanowires might change wave amplitudes and slide across each other, thus facilitating and maintaining a conducting network to accommodate the strain [23].Transdermal drug delivery is a promising drug delivery strategy to complement the limitations of traditional oral-and injectable-based methods. Transdermal drug delivery might potentially realize convenient and painless drug delivery and a sustained release profile with reduced side effects [24]. Advances in nanotechnology have led to the development of drug nanocarriers whi...

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Strain Sensors with Adjustable Sensitivity by Tailoring the Microstructure of Graphene Aerogel/PDMS Nanocomposites

Abstract: Strain sensors with high elastic limit and high sensitivity are required to meet the rising 14 demand for wearable electronics. Here we present the fabrication of highly sensitive strain-sensors 15 based on nanocomposites consisting of graphene aerogel (GA) and polydimethylsiloxane (PDMS),

Cited by 211 publications

References 43 publications

Strategies for Designing Stretchable Strain Sensors and Conductors

Strategies for Designing Stretchable Strain Sensors and Conductors

Multifunctions of Polymer Nanocomposites: Environmental Remediation, Electromagnetic Interference Shielding, And Sensing Applications

A Multifunctional Wearable Device with a Graphene/Silver Nanowire Nanocomposite for Highly Sensitive Strain Sensing and Drug Delivery

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