Recent Progress in Printed Physical Sensing Electronics for Wearable Health-Monitoring Devices: A Review

Ya, Ma Li; Soin, Norhayati

doi:10.1109/jsen.2022.3142328

Cited by 45 publications

(31 citation statements)

References 145 publications

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“…However, despite their excellent performance, the low-cost and the mass manufacturing requirements for IoT temperature monitoring applications make this approach less attractive for practical applications. In contrast, printing techniques such as screen-printing and inkjet printing are offering mass production of devices at low-cost through a wide variety of functional inks on flexible and recyclable substrates such as Polyimide (PI), Polyethylene Terephthalate (PET), and Polyethylene Naphthalate (PEN) [27].…”

Section: Introductionmentioning

confidence: 99%

Remote Monitoring of Skin Temperature Through a Wristband Employing a Printed VO Sensor

et al. 2023

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The need for highly sensitive, environmentally stable, mechanically flexible, and low-cost temperature sensors for on-body measurements has been increasing with the wide adoption of personal Healthcare-Internet-of-Things (H-IoT) devices. Printed electronics (PE) is a good platform for such sensors because it enables the realization of flexible devices through simple and rapid methods at a relatively low cost. However, previously reported printed temperature sensors suffer from poor sensitivity and/or environmental instability. In this paper, we report a custom Tungsten (W)-doped Vanadium Dioxide (VO2) ink-based screen-printed temperature sensor having the highest Temperature-Coefficient-of-Resistance (TCR) of 2.78%•°C -1 with a resolution of 0.1°C between 30°C and 40°C. To protect it from environmental effects, a fluoropolymer-based passivation layer is added for accurate temperature readings even in 90% relative humidity. The sensor is printed on a flexible substrate and shows minimal deterioration in performance over 1000 bending cycles. For wearability and remote monitoring, the sensor is integrated with a custom Bluetooth Low Energy (BLE) wireless readout in the form of a wristband. The BLE readout comprises an ultrathin and flexible patch antenna optimized for both BLE bandwidth and human wearability. It demonstrates a minimal SAR value of only 0.068W/kg, making it safe to wear. Despite the antenna's thin structure (0.004λ), it has a gain of 1.65dBi, enabling an excellent communication range. The proposed wristband is tested on ten volunteers and under daily activities, which shows promising results with a maximum error of 0.16°C with reference to those of a commercial thermometer.

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Section: Introductionmentioning

confidence: 99%

Remote Monitoring of Skin Temperature Through a Wristband Employing a Printed VO Sensor

et al. 2023

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“…The electrodes with high conductivity and stretchability are reported in several studies [ 19 , 26 , 64 , 65 , 66 ]. Various printing processes and fabrication strategies [ 67 , 68 , 69 , 70 , 71 ] have also been developed to fabricate electrodes with good skin contact [ 72 ]. The electrodes of wearable sensors have been developed from various materials with good conductivity, such as carbon-based nanomaterials [ 73 ], including graphene [ 74 , 75 ], carbon nanotubes (CNTs) [ 76 ], carbon fibers [ 77 ], or metals such as gold [ 18 , 21 , 22 , 78 ] or metallic nanoparticles including nickel and silver [ 79 ].…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Stretchable and Wearable Capacitive Electrophysiological Sensors for Long-Term Health Monitoring

et al. 2022

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Over the past several years, wearable electrophysiological sensors with stretchability have received significant research attention because of their capability to continuously monitor electrophysiological signals from the human body with minimal body motion artifacts, long-term tracking, and comfort for real-time health monitoring. Among the four different sensors, i.e., piezoresistive, piezoelectric, iontronic, and capacitive, capacitive sensors are the most advantageous owing to their reusability, high durability, device sterilization ability, and minimum leakage currents between the electrode and the body to reduce the health risk arising from any short circuit. This review focuses on the development of wearable, flexible capacitive sensors for monitoring electrophysiological conditions, including the electrode materials and configuration, the sensing mechanisms, and the fabrication strategies. In addition, several design strategies of flexible/stretchable electrodes, body-to-electrode signal transduction, and measurements have been critically evaluated. We have also highlighted the gaps and opportunities needed for enhancing the suitability and practical applicability of wearable capacitive sensors. Finally, the potential applications, research challenges, and future research directions on stretchable and wearable capacitive sensors are outlined in this review.

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“…Flexible electrode is an essential part of biosignal recording and plays a critically important role in health monitoring and medical diagnosis. [1][2][3][4][5] However, conductivity of flexible electronic devices can't be guaranteed due to the lack of reliability of existing flexible electrodes under various deformation and many other fields due to unique auxetic properties and outstanding mechanical properties including stronger shear resistance, fracture toughness and cracks propagation resistance, etc. [27][28][29][30][31][32] It is worth mentioning that the NPR structure has been reported many times to have the ability to improve flexible electrode mechanical performance.…”

Section: Introductionmentioning

confidence: 99%

“…Flexible electrode is an essential part of biosignal recording and plays a critically important role in health monitoring and medical diagnosis. [ 1–5 ] However, conductivity of flexible electronic devices can't be guaranteed due to the lack of reliability of existing flexible electrodes under various deformation conditions, which hinders the development of flexible electronics as an emerging technology. [ 6–10 ] Ideally, a flexible electrode should be provided reliable conductivity and mechanical flexibility at the same time.…”

Section: Introductionmentioning

confidence: 99%

Highly Flexible and Conductive Electrodes through Combining Honeycomb and Butterfly Pattern Bio‐Inspired Structure for ECG Signal Recording

Hou

Wang

Han

et al. 2022

Adv Materials Inter

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conditions, which hinders the development of flexible electronics as an emerging technology. [6][7][8][9][10] Ideally, a flexible electrode should be provided reliable conductivity and mechanical flexibility at the same time. [11,12] Therefore, a key problem that should be solved at present to obtain a flexible electrode with these two properties simultaneously.Currently, flexible electrode with metal film based on a flexible substrate is widely utilized due to the inherent excellent flexibility, high conductivity, simple processing and low cost. [13][14][15][16][17] Hence, some investigators have fabricated metal films on flexible substrates (e.g., polydimethylsiloxane (PDMS), polyimide (PI) and polyethylene terephthalate (PET), etc.) to realize the use of flexible electrodes in flexible electrons. For example, Wu et al. reported a flexible PDMS-based three-electrode sensor, which was flexible without inducing irreversible deformation or fatigue after electrochemical testing with forced deformations. [18] Xie et al. manufactured a patterned microelectrode array on PI substrate by photolithography, stripping and sputtering deposition processes, forming a wireless cortical electroencephalogram (EEG) recording system with excellent biocompatibility and flexibility. [19] Liu et al. fabricated a three-layer dry electrode based on PI substrate for detecting electrophysiological signals utilizing sacrificial-layer assisted one-step transfer printing method, which exhibits excellent conformability and stretchability and low electrode-skin contact impedance. [20] Liu et al. designed and fabricated a flexible microthree-dimensional temperature sensor with excellent stability and reliability on PI film by a microfabrication process to achieve in situ real-time temperature measurements. [21] Nonetheless, metal film of most flexible electrodes with flexible substrates often produces microcracks due to complex deformation of substrate, which eventually leads to the surface fracture of the metal film and then affects the conductivity of the electrode. Emergence of the issue will seriously shorten the service life of flexible electrode in flexible electronic equipment. [22][23][24][25][26] Consequently, a key challenge for designing independent high-performance electronic equipment is developing stretchable electrodes that can maintain metal film structural integrity during repeated severe deformations.The negative Poisson's ratio (NPR) structure has been successfully employed in flexible electronic, biomedicine, sensor Recent advances in the development of flexible electronic devices have increased the demand for flexibility and conductivity. However, there is still a significant challenge to manufacture flexible electrodes featuring satisfactory mechanical and conductivity performance simultaneously. In this paper, based on synergistically combining theoretical structural design and screen printing, a new flexible electrode with butterfly-shaped honeycomb (BSH) negative Poisson's ratio (NPR) structure through combining honeyc...

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Recent Progress in Printed Physical Sensing Electronics for Wearable Health-Monitoring Devices: A Review

Cited by 45 publications

References 145 publications

Remote Monitoring of Skin Temperature Through a Wristband Employing a Printed VO Sensor

Remote Monitoring of Skin Temperature Through a Wristband Employing a Printed VO Sensor

Recent Advances in Stretchable and Wearable Capacitive Electrophysiological Sensors for Long-Term Health Monitoring

Highly Flexible and Conductive Electrodes through Combining Honeycomb and Butterfly Pattern Bio‐Inspired Structure for ECG Signal Recording

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