Gold nanoparticle densely packed micro/nanowire-based pressure sensors for human motion monitoring and physiological signal detection

Nanoscale ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 4925-4932 ◽  
Author(s):  
Shun-Xin Li ◽  
Hong Xia ◽  
Yi-Shi Xu ◽  
Chao Lv ◽  
Gong Wang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Signal Detection ◽  
Gold Nanoparticle ◽  
Pressure Sensors ◽  
Human Motion ◽  
Physiological Signal ◽  
Human Motion Monitoring ◽  
Flexible Pressure Sensors

Gold nanoparticles were assembled into highly aligned micro/nanowires for flexible pressure sensors.

Synthesis of 2D Ti3C2Tx MXene for Flexible Strain and Pressure Sensors

2021 ◽  
Author(s):  
Yuping Zeng ◽  
Wei Wu
Keyword(s):  
Human Computer Interaction ◽  
Pressure Sensors ◽  
Human Motion ◽  
Flexible Sensors ◽  
Microelectronic Devices ◽  
Human Motion Monitoring ◽  
Computer Interaction

As an important device in flexible and wearable microelectronic devices, flexible sensors have engaged a lot of attention due to their wide application in human motion monitoring, human-computer interaction and...

Crafting NiCo2O4@Co9S8 nanotrees on carbon cloth as flexible pressure sensors for effectively monitoring human motion

2019 ◽  
Vol 10 (3) ◽  
pp. 861-867 ◽  
Author(s):  
Xingyan You ◽  
Qun Liu ◽  
Faliang He ◽  
Xing Chen ◽  
Xin Zhang ◽  
...  
Keyword(s):  
Pressure Sensors ◽  
Human Motion ◽  
Carbon Cloth ◽  
Flexible Pressure Sensors

Coupling piezoelectric and piezoresistive effects in flexible pressure sensors for human motion detection from zero to high frequency

2021 ◽  
Author(s):  
Lijun Lu ◽  
Ning Zhao ◽  
Jingquan Liu ◽  
Bin Yang
Keyword(s):  
Motion Detection ◽  
Human Activities ◽  
High Frequency ◽  
Wearable Sensors ◽  
Pressure Sensors ◽  
Health Condition ◽  
Human Motion ◽  
Human Motion Detection ◽  
Single Mechanism ◽  
Flexible Pressure Sensors

Flexible wearable sensors have received considerable popularity due to the potential application in monitoring human activities and health condition. However, traditional pressure sensors are always relying on single mechanism (such...

A Wireless Human Motion Monitoring System Based on Joint Angle Sensors and Smart Shoes

2014 ◽  
Author(s):  
Wenlong Zhang ◽  
Masayoshi Tomizuka ◽  
Nancy Byl
Keyword(s):  
Monitoring System ◽  
Joint Angle ◽  
Pressure Sensors ◽  
Human Motion ◽  
Contact Forces ◽  
Three Dimensions ◽  
Sensor Data ◽  
Measurement Unit ◽  
Clinical Environment ◽  
Human Motion Monitoring

In this paper, a wireless human motion monitoring system based on joint angle sensors and smart shoes is introduced. An inertial measurement unit (IMU) is employed in a joint angle sensor to estimate the lower-extremity joint rotation in three dimensions. Four pressure sensors are embedded in a smart shoe to measure the distribution of ground contact forces (GCFs). Zig-bee and Bluetooth modules are combined with the joint angle sensors and smart shoes respectively to make the whole system wireless. It is shown that gait phase and step length can be calculated based on the raw sensor data for gait analysis. To provide visual feedback to the users, with the consent of Apple Inc., an user interface application is developed on an iPad. Experimental results are obtained from both a healthy subject and a stroke patient for comparison. Some discussions are made about the potential use of this system in a clinical environment.

scholarly journals A Wireless Human Motion Monitoring System for Smart Rehabilitation

2016 ◽  
Vol 138 (11) ◽  
Author(s):  
Wenlong Zhang ◽  
Masayoshi Tomizuka ◽  
Nancy Byl
Keyword(s):  
Monitoring System ◽  
Visual Feedback ◽  
Inertial Sensors ◽  
Center Of Pressure ◽  
Physical Therapists ◽  
Pressure Sensors ◽  
Disease Patient ◽  
Measurement Data ◽  
Human Motion ◽  
Human Motion Monitoring

In this paper, a wireless human motion monitoring system is presented for gait analysis and visual feedback in rehabilitation training. The system consists of several inertial sensors and a pair of smart shoes with pressure sensors. The inertial sensors can capture lower-extremity joint rotations in three dimensions and the smart shoes can measure the force distributions on the two feet during walking. Based on the raw measurement data, gait phases, step lengths, and center of pressure (CoP) are calculated to evaluate the abnormal walking behaviors. User interfaces are developed on both laptops and mobile devices to provide visual feedback to patients and physical therapists. The system has been tested on healthy subjects and then applied in a clinical study with 24 patients. It has been verified that the patients are able to understand the intuitive visual feedback from the system, and similar training performance has been achieved compared to the traditional gait training with physical therapists. The experimental results with one healthy subject, one stroke patient, and one Parkinson's disease patient are compared to demonstrate the performance of the system.

Supersensitive all-fabric pressure sensors using printed textile electrode arrays for human motion monitoring and human–machine interaction

2018 ◽  
Vol 6 (48) ◽  
pp. 13120-13127 ◽  
Author(s):  
Ziqiang Zhou ◽  
Ying Li ◽  
Jiang Cheng ◽  
Shanyong Chen ◽  
Rong Hu ◽  
...  
Keyword(s):  
Cotton Fabric ◽  
Pressure Sensors ◽  
Human Motion ◽  
Electrode Arrays ◽  
Human Machine Interaction ◽  
Silver Paste ◽  
Textile Electrode ◽  
Human Motion Monitoring ◽  
Machine Interaction ◽  
Coated Cotton

Supersensitive all-fabric pressure sensors with a bottom interdigitated textile electrode screen-printed using silver paste and a top bridge of AgNW-coated cotton fabric are successfully fabricated for human motion monitoring and human–machine interaction.

High sensitivity and broad detection range flexible capacitive pressure sensor based on rGO cotton fiber for human motion detection

2021 ◽  
Author(s):  
Rongliang Zheng ◽  
Youyuan Wang ◽  
Zhanxi Zhang ◽  
Yanfang Zhang ◽  
Jinzhan Liu
Keyword(s):  
Pressure Sensor ◽  
Cotton Fiber ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Human Motion ◽  
Superior Performance ◽  
Capacitive Pressure Sensor ◽  
Joint Movement ◽  
Process Technology ◽  
Flexible Pressure Sensors

Abstract Recently, flexible pressure sensors have attracted considerable interest in electronic skins, wearable devices, intelligent robots and biomedical diagnostics. However, the design of high sensitivity flexible pressure sensors often relies on expensive materials and complex process technology, which greatly limit their popularity and applications. Even worse, chemical-based sensors are poorly biocompatible and harmful to the environment. Here, we developed a flexible capacitive pressure sensor based on reduced graphene oxide (rGO) cotton fiber by a simple and low-cost preparation process. The environmentally friendly sensor exhibited a comprehensive performance with not only ultra-high sensitivity (up to 15.84 kPa-1) and a broad sensing range (0-500 kPa), but also excellent repeatability (over 400 cycles), low hysteresis (≤11.6%), low detection limit (<0.1 kPa) and wide frequency availability (sensitivity from 19.71 kPa-1 to 11.24 kPa-1, frequency from 100 Hz to 10 kHz). Based on its superior performance, the proposed sensor can detect various external stimuli (vertical stress, bending and airflow) and has been successfully applied for facial expression recognition, breathing detection, joint movement and walking detection, showing great potential for application in artificial electronic skin and wearable healthcare devices.

Interference of Gold Nanoparticles with In vitro Endotoxin Detection Assays

2020 ◽  
Vol 16 (2) ◽  
pp. 204-213 ◽  
Author(s):  
Melissa A. Vetten ◽  
Mary Gulumian
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Surface Reactivity ◽  
In Vitro Assays ◽  
Limulus Amebocyte Lysate ◽  
Chromogenic Assay ◽  
Nanoparticle Suspensions ◽  
Endotoxin Contamination ◽  
Factor C

Background: Endotoxin-free engineered nanoparticle suspensions are imperative for their successful applications in the field of nanomedicine as well as in the investigations in their toxicity. Gold nanoparticles are known to interfere with various in vitro assays due to their optical properties and potential for surface reactivity. In vitro endotoxin testing assays are known to be susceptible to interference caused by the sample being tested. Objective: This study aimed to identify a preferred assay for the testing of endotoxin contamination in gold nanoparticle suspensions. Methods: The interference by gold nanoparticles on three assays namely, the commonly used limulus amebocyte lysate chromogenic assay, the limulus amebocyte lysate gel-clot method, and the less common recombinant Factor C (rFC) assay, was tested. Results: Possible interference could be observed with all three assays. The interference with the absorbance- based chromogenic assay could not be overcome by dilution; whilst the qualitative nature of the gel-clot assay excluded the possibility of distinguishing between a false positive result due to enhancement of the sensitivity of the assay, and genuine endotoxin contamination. However, interference with the rFC assay was easily overcome through dilution. Conclusion: The rFC assay is recommended as an option for endotoxin contamination detection in gold nanoparticle suspensions.

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