Hierarchically Structured Vertical Gold Nanowire Array-Based Wearable Pressure Sensors for Wireless Health Monitoring

Zhu, Bowen; Ling, Yunzhi; Yap, Lim Wei; Yang, Mingjie; Lin, Fenge; Gong, Shuping; Wang, Yan; An, Tiance; Zhao, Yunmeng; Cheng, Wenlong

doi:10.1021/acsami.9b06260

Cited by 157 publications

(121 citation statements)

References 56 publications

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“…Micro-structured polydimethylsiloxane (PDMS) is commonly used as a substrate when combined with carbon nanotubes, graphene, or another conductive material as the electrode. This basic approach can be used to fabricate piezoresistive flexible pressure sensors [23,24,25,26,27]. For example, Ko et al [28] used a silicon mold with periodic spherical holes to cast a mixture of carbon nanotubes and PDMS and obtained a pressure sensor with a maximum sensitivity of 15.1 kPa −1 .…”

Section: Introductionmentioning

confidence: 99%

Flexible Pressure Sensors with a Wide Detection Range Based on Self-Assembled Polystyrene Microspheres

Chen

Wang²,

Zhu

et al. 2019

Sensors

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Flexible pressure sensors are important components of electronic skin and flexible wearable devices. Most existing piezoresistive flexible pressure sensors have obtained high sensitivities, however, they have relatively small pressure detection ranges. Here, we report flexible pressure sensors with a wide detection range using polydimethylsiloxane (PDMS) as the substrate, carbon nanotube films as the electrode material, and self-assembled polystyrene microsphere film as the microstructure layer. The obtained pressure sensor had a sandwich structure, and had a wide pressure detection range (from 4 kPa to 270 kPa), a sensitivity of 2.49 kPa−1, and a response time of tens of milliseconds. Two hundred load–unload cycles indicated that the device had good stability. In addition, the sensor was obtained by large-area fabrication with a low power consumption. This pressure sensor is expected to be widely used in applications such as electronic skin and flexible wearable devices.

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Section: Introductionmentioning

confidence: 99%

Flexible Pressure Sensors with a Wide Detection Range Based on Self-Assembled Polystyrene Microspheres

Chen

Wang²,

Zhu

et al. 2019

Sensors

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Section: Power Consumptionmentioning

confidence: 99%

Flexible Pressure Sensors for Biomedical Applications: From Ex Vivo to In Vivo

Zheng

Chen

et al. 2020

Adv Materials Inter

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As an important branch of flexible electronics, flexible pressure sensors that combine unique advantages including light weight, flexibility, and low‐cost, have drawn extensive attention owing to their great potential for biomedical applications. In this review, the current state‐of‐the‐art flexible pressure sensors concerning common substrate and active materials, sensing mechanism, key parameters, sensitivity optimization strategies, and promising biomedical applications from ex vivo to in vivo and which results in the distinct requirements of materials and structure design is briefly reviewed. Finally, perspectives on the potential challenges of flexible pressure sensors are provided.

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“…The electrodes can be in a coplanar interdigitated geometry (Figure a) or they can be vertically aligned as a sandwich structure (Figure b) . The elastic layer is patterned to tune the elastic modulus; some microstructure examples include sponges, pyramidal structures, and nanowires which specifically allow sensors to be anisotropic and selectively respond only to a certain pressure direction . Resistance R is given by R = ρL / A , where ρ is the resistivity, L is the length, and A is the cross‐sectional area of the elastic layer.…”

Section: Sensor Designs and Mechanismsmentioning

confidence: 99%

Flexible Pressure Sensors for Objective Assessment of Motor Disorders

Amit

Chukoskie

Skalsky

et al. 2019

Adv Funct Materials

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Monitoring body motion is relevant to motor control disorders as well as assessment of fine motor skills in child development. Furthermore, motion tracking is necessary for rehabilitation monitoring and injury prevention and benefits both sick and healthy individuals. Flexible pressure sensors based on resistors, capacitors, inductors, or transistors are reviewed in the context of healthcare measurements, ranging from physiological signals to body movement characteristics such as grip and gait. To demonstrate the use of flexible pressure sensors for motor assessment, a touch sensing glove that evaluates fine motor skills in autism research is developed. The results show that autistic children perform fewer taps per minute compared to typically developing children, with larger variations in tap durations. In a second example, a force and motion sensing glove is developed to assess spasticity, a neuromuscular disorder that causes muscle stiffness/resistance and jerky movement. Analyses of force versus velocity show movement-dependent muscle resistance in a patient with spasticity. Through these flexible sensor systems, the shift from subjective scores to objective measurement will promote better diagnosis and dramatically improve the accuracy in tracking patient response to therapy.patients doing certain movements, and then clinicians rank each patient's level according to qualitative descriptions in benchmark classification scales. [12,13] The subjective scores can be inconsistent between raters and do not capture finelevel changes in a patient's progress in response to therapy. Therefore, there is a critical need to tackle the issue of imprecise assessment of motor disorders.With recent advances in flexible sensors and innovations in tactile sensing, [14][15][16][17][18][19] we have new low-cost technologies that are prime to facilitate quantitative evaluation of motor control. This progress report presents current developments in wearable sensor systems applicable to motor disorders, so that consistent, objective metrics become available to accurately track whether a treatment effectively relieves symptoms. The wearable sensors are not limited to placement on patients but can also be worn by clinicians or caregivers to assist them in taking measurements during patient interactions. [20,21] The point-of-care sensor systems will allow frequent monitoring, which is highly desirable to offer a better understanding of the patient's short and long-term response to therapies, to tailor treatment and improve outcome and quality of life for patients.Other reviews [14][15][16][17][18][19] have already extensively covered the flexible materials and devices used in tracking vital signs and electronic skin applications. In light of that, this progress report focuses on the applications in monitoring motor skills, in particular to implement pressure sensor designs for wearable systems with diverse form factors, for instance, gloves, [20,22,23] epidermal tags tags, [24,25] and shoe insoles. [26,27] We will discuss the mechanis...

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Hierarchically Structured Vertical Gold Nanowire Array-Based Wearable Pressure Sensors for Wireless Health Monitoring

Cited by 157 publications

References 56 publications

Flexible Pressure Sensors with a Wide Detection Range Based on Self-Assembled Polystyrene Microspheres

Flexible Pressure Sensors with a Wide Detection Range Based on Self-Assembled Polystyrene Microspheres

Flexible Pressure Sensors for Biomedical Applications: From Ex Vivo to In Vivo

Flexible Pressure Sensors for Objective Assessment of Motor Disorders

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