Highly sensitive and flexible strain sensors based on vertical zinc oxide nanowire arrays

Zhang, Wengui; Zhu, Ren; Nguyen, Vu; Yang, Rusen

doi:10.1016/j.sna.2013.11.004

Cited by 94 publications

(66 citation statements)

References 32 publications

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“…In addition, strain sensors in human-motion detection need to satisfy the following requirements: high stretchability, fl exibility, high sensitivity, high durability, fast response/recovery speeds, and conformability. [ 122 ] Therefore, various types of fl exible and stretchable strain sensing materials such as P(VDF-TrFE), [ 77,123 ] ZnO NWs, [124][125][126][127][128][129] ZnSnO 3 NWs, [ 130 ] CNTs, [ 31,119,131,132 ] CNT composites, [ 28,133 ] graphene, [ 36,[134][135][136][137][138][139] R-GO, [ 121,[140][141][142] R-GO composites, [ 10,34,143 ] Ag NWs, [ 33 ] polymeric nanofi bers, [ 30 ] carbon black (CB), [ 11,144 ] organic semiconductors, [ 32,145,146 ] metal NPs, [ 122 ] Si NWs, [ 147 ] GaInSn, [ 148 ] and conductive polymers [149][150][151][152]…”

Section: Flexible and Stretchable Strain Sensormentioning

confidence: 99%

“…[ 127 ] In recent years, several piezo electric strain sensors have been developed using P(VDF-TrFE) [ 77,123 ] and ZnO NWs. [124][125][126][127][128][129] Sun et al [ 123 ] reported an active-matrix strain sensor based on a piezopotential-power graphene transistor. The sensor device included a piezopotential nanogenerator (NG) (strain sensor element) and a coplanar-gate graphene transistor (GT).…”

Section: Piezoelectric Strain Sensorsmentioning

confidence: 99%

“…[ 127 ] Therefore, ZnO NWs directly grown on a fl exible substrate for strain sensors have been developed. Zhang et al [ 125 ] reported a fl exible strain sensor with vertically aligned ZnO NWs arrays. A GF of up to 1813 was obtained from this strain sensor, which is higher than the strain sensor device based on a single ZnO NW.…”

Section: Piezoelectric Strain Sensorsmentioning

confidence: 99%

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Flexible and Stretchable Physical Sensor Integrated Platforms for Wearable Human‐Activity Monitoringand Personal Healthcare

2016

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Flexible and stretchable physical sensors that can measure and quantify electrical signals generated by human activities are attracting a great deal of attention as they have unique characteristics, such as ultrathinness, low modulus, light weight, high flexibility, and stretchability. These flexible and stretchable physical sensors conformally attached on the surface of organs or skin can provide a new opportunity for human-activity monitoring and personal healthcare. Consequently, in recent years there has been considerable research effort devoted to the development of flexible and stretchable physical sensors to fulfill the requirements of future technology, and much progress has been achieved. Here, the most recent developments of flexible and stretchable physical sensors are described, including temperature, pressure, and strain sensors, and flexible and stretchable sensor-integrated platforms. The latest successful examples of flexible and stretchable physical sensors for the detection of temperature, pressure, and strain, as well as their novel structures, technological innovations, and challenges, are reviewed first. In the next section, recent progress regarding sensor-integrated wearable platforms is overviewed in detail. Some of the latest achievements regarding self-powered sensor-integrated wearable platform technologies are also reviewed. Further research direction and challenges are also proposed to develop a fully sensor-integrated wearable platform for monitoring human activity and personal healthcare in the near future.

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Section: Flexible and Stretchable Strain Sensormentioning

confidence: 99%

Section: Piezoelectric Strain Sensorsmentioning

confidence: 99%

Section: Piezoelectric Strain Sensorsmentioning

confidence: 99%

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Flexible and Stretchable Physical Sensor Integrated Platforms for Wearable Human‐Activity Monitoringand Personal Healthcare

2016

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“…[107] When the applied strain is released, it is difficult for the nanomaterials to slide back to the initial position or for the cracks to be completely closed. Due to the viscoelasticity of polymers and the friction between the nanomaterials and the polymer matrix during loading and unloading, rearrangement of nanomaterials Polyaniline doped AuNW/Latex rubber [68] Resistive 2-12 for 0-100% 149.6% -Human finger-controlled robotic arm system AuNW/Latex rubber [44] Resistive 9.9 (0-5%), 6.9 (5-50%) 300% 0.01% Data glove, monitoring of forearm muscle movement, cheek movement, phonation, and wrist pulse AgNW/Ecoflex/AgNW [41] Capacitive 0.7 50% -Monitoring of finger bending and knee motion CNT/Ecoflex/CNT [25] Capacitive 0.4 50% --CNT/silicone/CNT [127] Capacitive 0.99 100% -Robotic linkage CNT/Dragon Skin/CNT [129] Capacitive 1 300% -Date glove, monitoring of balloon inflation and chest movement PVDF-TrFE with graphene FET [134] Piezoelectric 389 ≈0.3% 0.008% Monitoring of hand movement ZnO NW array [132] Piezoelectric 1813 0.8% --Carbon fiber-ZnO NW [217] Piezoelectric 60-80 1.2% 0.2% -www.advancedsciencenews.com www.advhealthmat. de and opening of cracks results in time delay between electrical output and mechanical input.…”

Section: Resistive Strain Sensorsmentioning

confidence: 99%

“…Various piezoelectric materials such as ZnO nanostructures, [40,132,133] poly(vinylidenefluoride-co-trifluoroethylene) (PVDF-TrFE) [134] and polylactic acid (PLA) [22] have been used to develop wearable strain sensors. For instance, a wearable piezoelectric bending sensor was fabricated using ZnO nanorods (NRs) as strain sensing materials and AgNW-SWCNT composites as electrodes.…”

Section: Piezoelectric Strain Sensorsmentioning

confidence: 99%

Nanomaterial‐Enabled Wearable Sensors for Healthcare

Yao

Swetha

Zhu

2017

Adv Healthcare Materials

454

296

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humidity level, and concentration of harmful gases, and airborne particulates can provide valuable information for the prediction, management, and treatment of chronic diseases. [4,5] In addition to the applications in wearable health monitoring, continuous tracking of daily and sports activities can offer an efficient way to assess the well-being and athletic performances. [6] In order to ensure a robust and conformal contact with the curvilinear, coarse, and dynamic surface of skin without impeding daily activities, the wearable sensor should have low modulus and high stretchability. The epidermis has a modulus of 140-600 kPa while the dermis has an even lower modulus of 2-80 kPa. [7] Skin itself can be stretched elastically up to 15% and with the help of wrinkles and creases, the overall stretchability can reach as high as 100% during daily motions. [8] In addition to good wearability, wearable sensors should be highly sensitive, lightweight, low-cost, and with low power consumption. To achieve these features, nanomaterials that are compliant, possessing larger surface area and exceptional material properties, and compatible with low-cost fabrication processes are widely employed as building blocks for developing wearable sensors.In this review, we start from a brief overview of nanomaterials, their related structural designs and fabrication processes (Section 2). Following that, recent advances of nanomaterialenabled wearable sensors including temperature, electrophysiological, strain, tactile, electrochemical, and other sensors will be summarized (Section 3). A survey on the integration of multiple sensors and other components into wearable systems will be given in Section 4. The application of nanomaterialenabled wearable sensors for healthcare including health monitoring, activity tracking, and electronic skin will be presented in Section 5. The challenges and opportunities will be discussed at the end. Nanomaterials, Structural Designs, and Fabrication ProcessesNanomaterials can be classified into two categories-top-down fabricated ones and bottom-up synthesized ones. [9] The focus of this review is on the wearable sensors based on bottom-up synthesized nanomaterials. Nanomaterials can be synthesized into various dimensions, from 0D such as metallic nanoparticles (NPs), to 1D such as carbon nanotubes (CNTs), and metallic nanowires (NWs), to 2D such as graphene and transition metal Highly sensitive wearable sensors that can be conformably attached to human skin or integrated with textiles to monitor the physiological parameters of human body or the surrounding environment have garnered tremendous interest. Owing to the large surface area and outstanding material properties, nanomaterials are promising building blocks for wearable sensors. Recent advances in the nanomaterial-enabled wearable sensors including temperature, electrophysiological, strain, tactile, electrochemical, and environmental sensors are presented in this review. Integration of multiple sensors for multimodal sensing and integration with...

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Nanomaterials for Wearable, Flexible, and Stretchable Strain/Pressure Sensors

Sedighi¹,

Montazer²

2022

Nanotechnology in Electronics

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Highly sensitive and flexible strain sensors based on vertical zinc oxide nanowire arrays

Cited by 94 publications

References 32 publications

Flexible and Stretchable Physical Sensor Integrated Platforms for Wearable Human‐Activity Monitoringand Personal Healthcare

Flexible and Stretchable Physical Sensor Integrated Platforms for Wearable Human‐Activity Monitoringand Personal Healthcare

Nanomaterial‐Enabled Wearable Sensors for Healthcare

Nanomaterials for Wearable, Flexible, and Stretchable Strain/Pressure Sensors

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