Skin-conformal MXene-doped wearable sensors with self-adhesive, dual-mode sensing, and high sensitivity for human motions and wireless monitoring

2021 ◽  
Author(s):  
Yuegang Sun ◽  
Shuang Wang ◽  
Xiaosheng Du ◽  
Haibo Wang ◽  
xu Cheng ◽  
...  
Keyword(s):  
Information Acquisition ◽  
Wearable Sensors ◽  
High Sensitivity ◽  
Dual Mode ◽  
Flexible Sensors ◽  
Wireless Monitoring ◽  
Flexible Sensor ◽  
High Toughness ◽  
Human Motions

Flexible sensors have attracted extensive attention due to their excellent flexibility, biocompatibility, and information acquisition accuracy. Therefore, it is desired to fabricate a flexible sensor with high toughness and sensitivity...

scholarly journals Effect of Elasticity on Electrical Properties of Weft-Knitted Conductive Fabrics

2021 ◽  
Vol 29 (1(145)) ◽  
pp. 47-52
Author(s):  
Xiaoxue Han ◽  
Xuhong Miao ◽  
Xiaohan Chen ◽  
Li Niu ◽  
Ailan Wan
Keyword(s):  
Large Scale ◽  
Wearable Sensors ◽  
Test Method ◽  
Polymer Materials ◽  
Electrical Performance ◽  
Flexible Sensors ◽  
Sensing Properties ◽  
Substrate Elasticity ◽  
The Impact ◽  
Human Motions

Because of softness and lightness, various flexible sensors have attracted extensive attention and been widely studied. Sensing mechanism of most wearable sensors is derived from an elastic substrate, such as fabric or polymer materials. Although the mechanical-electrical performance of several flexible sensors has been reported, including sensitivity, linearity hysteresis and repeatability, research on the effects of substrate elasticity on sensor capacity is scarce. In this paper, the impact of spandex content, washing and ironing processing on the elasticity of weft knitted sensors was investigated by the constant- extension test method. Afterwards, differences in sensing properties between diverse elastic sensors under single as well as repeated stretch were reported. The experimental results showed that spandex content does influence the elasticity of knitted fabric, which has a further great effect on sensing properties. A highly elastic sensor is capable of detecting large-scale human motions, while sensors with lower elasticity are opposite, which demonstrates that elastic sensors can be designed and chosen to meet the requirements of detecting and monitoring distinct human motions.

Photocurable 3D Printing of High Toughness and Self‐Healing Hydrogels for Customized Wearable Flexible Sensors

2021 ◽  
pp. 2107202
Author(s):  
Yuchao Wu ◽  
Yong Zeng ◽  
Yizhen Chen ◽  
Chao Li ◽  
Renhui Qiu ◽  
...  
Keyword(s):  
3D Printing ◽  
Self Healing ◽  
Flexible Sensors ◽  
High Toughness

scholarly journals Tetraphenylethylene-conjugated polycation covered iron oxide nanoparticles for magnetic resonance/optical dual-mode imaging

2021 ◽  
Vol 8 (3) ◽  
Author(s):  
Li Yang ◽  
Shengxiang Fu ◽  
Li Liu ◽  
Zhongyuan Cai ◽  
Chunchao Xia ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Magnetic Resonance ◽  
Superparamagnetic Iron Oxide ◽  
High Sensitivity ◽  
Dual Mode ◽  
Grafting Ratio ◽  
High Fluorescence Intensity ◽  
Alkane Chain ◽  
High Fluorescence ◽  
Intramolecular Rotation

Abstract Magnetic resonance (MR)/optical dual-mode imaging with high sensitivity and high tissue resolution have attracted many attentions in biomedical applications. To avert aggregation-caused quenching of conventional fluorescence chromophores, an aggregation-induced emission molecule tetraphenylethylene (TPE)-conjugated amphiphilic polyethylenimine (PEI) covered superparamagnetic iron oxide (Alkyl-PEI-LAC-TPE/SPIO nanocomposites) was prepared as an MR/optical dual-mode probe. Alkyl-PEI-LAC-TPE/SPIO nanocomposites exhibited good fluorescence property and presented higher T2 relaxivity (352 Fe mM−1s−1) than a commercial contrast agent Feridex (120 Fe mM−1s−1) at 1.5 T. The alkylation degree of Alkyl-PEI-LAC-TPE effects the restriction of intramolecular rotation process of TPE. Reducing alkane chain grafting ratio aggravated the stack of TPE, increasing the fluorescence lifetime of Alkyl-PEI-LAC-TPE/SPIO nanocomposites. Alkyl-PEI-LAC-TPE/SPIO nanocomposites can effectively labelled HeLa cells and resulted in high fluorescence intensity and excellent MR imaging sensitivity. As an MR/optical imaging probe, Alkyl-PEI-LAC-TPE/SPIO nanocomposites may be used in biomedical imaging for certain applications.

scholarly journals Design and Manufacture of Data Gloves for Rehabilitation Training and Gesture Recognition Based on Flexible Sensors

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Kai Guo ◽  
Senhao Zhang ◽  
Shasha Zhao ◽  
Hongbo Yang
Keyword(s):  
Experimental Data ◽  
Gesture Recognition ◽  
The Self ◽  
Hand Rehabilitation ◽  
Data Glove ◽  
Flexible Sensors ◽  
Rehabilitation Training ◽  
Flexible Sensor ◽  
The Core ◽  
Design And Manufacture

This work takes the production and usage scenarios of the data glove as the research object and studies the method of applying the flexible sensor to the data glove. Many studies are also devoted to exploring the transplantation of flexible sensors to data gloves. However, this type of research still lacks the display of specific application scenarios such as gesture recognition or hand rehabilitation training. A small amount of experimental data and theoretical analysis are difficult to promote the development of flexible sensors and flexible data gloves design schemes. Therefore, this study uses the self-made flexible sensor of the research group as the core sensing unit to produce a flexible data glove to monitor the bending changes of the knuckles and then use it for simple gesture recognition and rehabilitation training.

Dual‐Mode Wearable Strain Sensor Based on Graphene/Colloidal Crystal Films for Simultaneously Detection of Subtle and Large Human Motions

2020 ◽  
Vol 5 (2) ◽  
pp. 1901056 ◽  
Author(s):  
Hua Xu ◽  
Ming Kun Zhang ◽  
Yi Fei Lu ◽  
Jia Jia Li ◽  
Si Jia Ge ◽  
...  
Keyword(s):  
Colloidal Crystal ◽  
Strain Sensor ◽  
Dual Mode ◽  
Crystal Films ◽  
Human Motions

Bioinspired, multifunctional dual-mode pressure sensors as electronic skin for decoding complex loading processes and human motions

Nano Energy ◽  
2020 ◽  
Vol 78 ◽  
pp. 105337 ◽  
Author(s):  
Ye Qiu ◽  
Ye Tian ◽  
Shenshen Sun ◽  
Jiahui Hu ◽  
Youyan Wang ◽  
...  
Keyword(s):  
Pressure Sensors ◽  
Complex Loading ◽  
Dual Mode ◽  
Electronic Skin ◽  
Human Motions

scholarly journals SETI: The Microwave Search Problem and the Nasa Sky Survey Approach

1985 ◽  
Vol 112 ◽  
pp. 397-403
Author(s):  
Michael J. Klein ◽  
Samuel Gulkis
Keyword(s):  
Search Strategy ◽  
High Sensitivity ◽  
Search Problem ◽  
Dual Mode ◽  
Ongoing Work ◽  
Sky Survey ◽  
Frequency Coverage ◽  
Complementary Nature ◽  
Low Sensitivity ◽  
Survey Approach

NASA's microwave observing program for SETI is presented. This strategy is composed of a high sensitivity, narrow frequency coverage, Target Search and a low sensitivity, broad frequency coverage, Sky Survey. The complementary nature of this dual mode search strategy is discussed. An overview is given of ongoing work in the development of the search strategy for the Sky Survey.

A high-sensitivity dual-mode optical thermometry based on one-step synthesis of Mn2+:BaAl12O19–Mn4+:SrAl12O19 solid solution phosphors

2021 ◽  
Vol 853 ◽  
pp. 157262
Author(s):  
Yanting Zhu ◽  
Chenxia Li ◽  
Degang Deng ◽  
Bowen Chen ◽  
Hua Yu ◽  
...  
Keyword(s):  
Solid Solution ◽  
High Sensitivity ◽  
Dual Mode ◽  
Optical Thermometry ◽  
One Step

scholarly journals Wireless Wearable Electrochemical Sensors: A Review

2021 ◽  
Vol 8 (10Years) ◽  
Author(s):  
Thais Alves ◽  
Patricia Deroco ◽  
Dagwin Wachholz Junior ◽  
Lourenço Vidotto ◽  
Lauro Kubota
Keyword(s):  
Chemical Sensor ◽  
New Technologies ◽  
Electrochemical Sensors ◽  
Wearable Sensors ◽  
High Sensitivity ◽  
Fast Response ◽  
Manufacturing Cost ◽  
Time Data ◽  
Power Sources ◽  
Home Based

The demand for wearable sensors has been grown rapidly over the past few years, mainly those related to monitor health, fitness and their surroundings. Consequently, wearable chemical sensing has become a crucial appliance area for wireless sensors and has proved to be a very challenging and multidisciplinary area. The great advantage of coupling wireless communication to different types of wearable sensors is the enhancement of the sensor’s scope for remote and resource-limited settings with the possibility of obtaining real-time data acquisition and application in different areas like homeland defense, home-based healthcare, and food logistics. Being the electrochemical sensors considered attractive and promising to use in the wireless chemical sensor field, due to its features such as simple structure, the possibility of miniaturization, comfort, simplicity of operation, high sensitivity, fast response, relatively low energy consumption and low manufacturing cost. Furthermore, wearable electrochemical sensors enable obtaining insights into individuals' health status through the noninvasive monitoring of clinically relevant biomarkers in different biofluids without complex sampling, manipulation and treatment steps. In this review, we present the main advances in technologies used in the development of fully integrated wireless wearable electrochemical devices, such as communication protocols, data collection and privacy concerns and power sources. We also discuss in a critical way the main challenges, trends, strategies and new technologies that will drive this research line in the future. Lastly, we highlight the progress in the last few years in healthcare, sports, security and defense, and forensic applications.

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