Wearable Alignment-Free Microfiber-Based Sensor Chip for Precise Vital Signs Monitoring and Cardiovascular Assessment

Li, Liangye; Liu, Yunfei; Song, Changying; Sheng, Shunfeng; Yang, Liuyang; Yan, Zhijun; Hu, Dora Juan Juan; Sun, Qizhen

doi:10.1007/s42765-021-00121-8

Cited by 44 publications

(22 citation statements)

References 32 publications

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“…As a combination of fiber optics and nanotechnology, optical micro/nano fibers (MNF) with smooth surface, good mechanical flexibility, micro/nano structure, and other properties have become a good choice for improving sensor sensitivity, response speed, optical resolution, and detection performance. 56,57 The basic structure, functional materials, and signal conduction used by the MNF sensor are shown in Fig. 4.…”

Section: Optical Wearable Sensorsmentioning

confidence: 99%

Recent advances in skin-like wearable sensors: sensor design, health monitoring, and intelligent auxiliary

Huang

Cheng³

et al. 2022

Sens. Diagn.

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Section: Optical Wearable Sensorsmentioning

confidence: 99%

Recent advances in skin-like wearable sensors: sensor design, health monitoring, and intelligent auxiliary

Huang

Cheng³

et al. 2022

Sens. Diagn.

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“…This spatially insensitive, low-power (≈35 nW) LCPS can be easily installed by the user while ensuring the sensing ability of the sensor’s high-fidelity epidermal pulse signal. In addition, using the wearable pressure sensor array to measure the temporal and spatial pulse waves to obtain the best pulse waveform can also be regarded as a solution [ 18 , 39 ]. Baek et al used inkjet printing technology to fabricate thin-film transistor (TFT) arrays integrated with thin sheets of highly sensitive piezoresistive sensors ( Figure 3 B) [ 39 ].…”

Section: Biomechanical Monitoring In the Cardiovascular Systemmentioning

confidence: 99%

“…Both optical methods (i.e., photoplethysmography (PPG)) and mechanical methods (i.e., pressure/strain sensors) have been extensively investigated for the acquisition of physiological information from the cardiovascular system [ 7 ]. PPG methods measure blood volume changes during each cardiac cycle by irradiating tissue and calculating light absorption in the vascular system [ 18 ]. Although the PPG sensor is more mature and can be easily integrated into a variety of consumer electronics, it consumes relatively high electrical power, typically in the range of 10–100 mW for continuous monitoring.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Sensors for Cardiovascular Monitoring: From Battery-Powered to Self-Powered

Tang

Liu

2022

Biosensors

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Cardiovascular disease is one of the leading causes of death worldwide. Long-term and real-time monitoring of cardiovascular indicators is required to detect abnormalities and conduct early intervention in time. To this end, the development of flexible wearable/implantable sensors for real-time monitoring of various vital signs has aroused extensive interest among researchers. Among the different kinds of sensors, mechanical sensors can reflect the direct information of pressure fluctuations in the cardiovascular system with the advantages of high sensitivity and suitable flexibility. Herein, we first introduce the recent advances of four kinds of mechanical sensors for cardiovascular system monitoring, based on capacitive, piezoresistive, piezoelectric, and triboelectric principles. Then, the physio-mechanical mechanisms in the cardiovascular system and their monitoring are described, including pulse wave, blood pressure, heart rhythm, endocardial pressure, etc. Finally, we emphasize the importance of real-time physiological monitoring in the treatment of cardiovascular disease and discuss its challenges in clinical translation.

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“…Thus, the great demand for flexible, high-performance, and high energy efficiency TFTs has emerged [ 10 ]. Recently, flexible electronics attracted great interest in the field of wearable health management devices and flexible displays for their intrinsic properties including bendable, deformable, and portable [ 11 , 12 ]. Especially, as essential components of the pixel-drive circuits, TFTs work as the driving switches playing a significant role in organic light-emitting displays and liquid–crystal displays [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Al2O3/HfO2 Nanolaminate Dielectric Boosting IGZO-Based Flexible Thin-Film Transistors

et al. 2022

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Highlights A stable laminated Al 2 O 3 /HfO 2 insulator is developed by atomic layer deposition at a relatively lower temperature of 150 °C. The flexible thin-film transistors (TFTs) with bottom-gate top-contacted configuration are fabricated on a flexible substrate with the Al 2 O 3 /HfO 2 insulator. The flexible TFTs present the carrier mobilities of 9.7 cm 2 V −1 s −1 , ON/OFF ratio of ~ 1.3 × 10 6 , subthreshold voltage of 0.1 V, saturated current up to 0.83 mA, and subthreshold swing of 0.256 V dec −1 . Abstract Flexible thin-film transistors (TFTs) have attracted wide interest in the development of flexible and wearable displays or sensors. However, the conventional high processing temperatures hinder the preparation of stable and reliable dielectric materials on flexible substrates. Here, we develop a stable laminated Al 2 O 3 /HfO 2 insulator by atomic layer deposition at a relatively lower temperature of 150 °C. A sputtered amorphous indium-gallium-zinc oxide (IGZO) with the stoichiometry of In 0.37 Ga 0.20 Zn 0.18 O 0.25 is used as the active channel material. The flexible TFTs with bottom-gate top-contacted configuration are further fabricated on a flexible polyimide substrate with the Al 2 O 3 /HfO 2 nanolaminates. Benefited from the unique structural and compositional configuration in the nanolaminates consisting of amorphous Al 2 O 3 , crystallized HfO 2 , and the aluminate Al–Hf–O phase, the as-prepared TFTs present the carrier mobilities of 9.7 cm 2 V −1 s −1 , ON/OFF ratio of ~ 1.3 × 10 6 , subthreshold voltage of 0.1 V, saturated current up to 0.83 mA, and subthreshold swing of 0.256 V dec −1 , signifying a high-performance flexible TFT, which simultaneously able to withstand the bending radius of 40 mm. The TFTs with nanolaminate insulator possess satisfactory humidity stability and hysteresis behavior in a relative humidity of 60–70%, a temperature of 25–30 °C environment. The yield of IGZO-based TFTs with the nanolaminate insulator reaches 95%. Supplementary Information ...

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Wearable Alignment-Free Microfiber-Based Sensor Chip for Precise Vital Signs Monitoring and Cardiovascular Assessment

Cited by 44 publications

References 32 publications

Recent advances in skin-like wearable sensors: sensor design, health monitoring, and intelligent auxiliary

Recent advances in skin-like wearable sensors: sensor design, health monitoring, and intelligent auxiliary

Mechanical Sensors for Cardiovascular Monitoring: From Battery-Powered to Self-Powered

Al2O3/HfO2 Nanolaminate Dielectric Boosting IGZO-Based Flexible Thin-Film Transistors

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