Network cracks-based wearable strain sensors for subtle and large strain detection of human motions

Wang, Shuai; Xiao, Peng; Liang, Yun; Zhang, Jiawei; Huang, Youju; Wu, Si; Kuo, Shiao‐Wei; Chen, Tao

doi:10.1039/c8tc00433a

Cited by 183 publications

(151 citation statements)

References 46 publications

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“…In this system, due to the slight oxidation of the CNTs, it can be dispersed uniformly into the ethanol solvent in a stable state (Figure S2, Supporting Information). As shown in Figure a, a large‐scale CNT film was self‐assembled on the water surface through a spray‐coating and capillary force driving compression strategy (Figure S3, Supporting Information), followed by an in situ transfer onto the paper surface. Based on the capillarity transfer mechanism, when the water penetrated through the porous CNT film to the fibrous paper, the generated capillary force can effectively enhance the supramolecular interaction between —OH on the surface of the CNT film and paper (Figure S4 and S5, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Rationally Programmable Paper‐Based Artificial Trees Toward Multipath Solar‐Driven Water Extraction from Liquid/Solid Substrates

et al. 2019

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Solar vaporization, which is emerged as a promising candidate for harvesting solar energy in sewage purification and/or seawater desalination, has attracted increasing interests during the last few years. Although tremendous advances are made, it is still challenging to realize simple fabrication protocols, low‐cost, and rationally editable 3D structures toward multipath water extraction from liquid/solid media. Inspired by natural plants with hierarchical structures rooted in soils, herein, an artificial tree of carbon nanotubes (CNTs) film/paper hybrid with tunable transpiration toward multipath water extraction under solar illumination is rationally designed. In this system, an interfacial‐assisted transfer strategy is developed to alternatively transfer the self‐assembled CNT films at the air/water interface onto one side of arbitrary substrates in a uniform/patterned way. The paper‐based photothermal absorbers with favorable tailorability and foldability allow the transformation of the 2D evaporators to tree‐like 3D ones. The achieved 3D evaporators with specific structures can extract purified water ranging from conventional liquid phase (e.g., water) to solid phase (e.g., sand), which can significantly extend the application of water extraction.

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Section: Resultsmentioning

confidence: 99%

Rationally Programmable Paper‐Based Artificial Trees Toward Multipath Solar‐Driven Water Extraction from Liquid/Solid Substrates

et al. 2019

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“…Apart from these piezoresistive mechanisms, a new cracking mechanism inspired by spider's sensory system basing on slit organ ( Figure a–c) . has recently been identified and used to develop highly sensitive sensors.…”

Section: Characteristics Of Stretchable Strain Sensors/conductorsmentioning

confidence: 99%

Strategies for Designing Stretchable Strain Sensors and Conductors

Peng

et al. 2020

Adv Materials Technologies

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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“…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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Network cracks-based wearable strain sensors for subtle and large strain detection of human motions

Abstract: Macroscopic multilayer free-standing CNTs films/PDMS composite with cracks in the network structure displays ability for the full-range detection of human motions.

Cited by 183 publications

References 46 publications

Rationally Programmable Paper‐Based Artificial Trees Toward Multipath Solar‐Driven Water Extraction from Liquid/Solid Substrates

Rationally Programmable Paper‐Based Artificial Trees Toward Multipath Solar‐Driven Water Extraction from Liquid/Solid Substrates

Strategies for Designing Stretchable Strain Sensors and Conductors

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

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