scholarly journals Linearly Sensitive and Flexible Pressure Sensor Based on Porous Carbon Nanotube/Polydimethylsiloxane Composite Structure

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1499 ◽  
Author(s):  
Young Jung ◽  
Kyung Kuk Jung ◽  
Dong Hwan Kim ◽  
Dong Hwa Kwak ◽  
Jong Soo Ko
Keyword(s):  
Carbon Nanotube ◽  
Pressure Sensor ◽  
Porous Carbon ◽  
Composite Structure ◽  
Low Cost ◽  
Human Motion ◽  
Mechanical And Electrical Properties ◽  
Human Motion Detection ◽  
Working Principle ◽  
Flexible Pressure Sensor

We developed a simple, low-cost process to fabricate a flexible pressure sensor with linear sensitivity by using a porous carbon nanotube (CNT)/polydimethylsiloxane (PDMS) composite structure (CPCS). The working principle of this pressure sensor is based on the change in electrical resistance caused by the contact/non-contact of the CNT tip on the surface of the pores under pressure. The mechanical and electrical properties of the CPCSs could be quantitatively controlled by adjusting the concentration of CNTs. The fabricated flexible pressure sensor showed linear sensitivity and excellent performance with regard to repeatability, hysteresis, and reliability. Furthermore, we showed that the sensor could be applied for human motion detection, even when attached to curved surfaces.

scholarly journals Microdome-Tunable Graphene/Carbon Nanotubes Pressure Sensors Based on Polystyrene Array for Wearable Electronics

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7385
Author(s):  
Xingjie Su ◽  
Chunli Luo ◽  
Weiguo Yan ◽  
Junyi Jiao ◽  
Dongzhou Zhong
Keyword(s):  
Carbon Nanotubes ◽  
Pressure Sensor ◽  
Self Assembly ◽  
Low Cost ◽  
Pressure Sensors ◽  
Conductive Filler ◽  
Human Motion ◽  
Wearable Electronics ◽  
Flexible Pressure Sensor ◽  
Human Finger

Resistive pressure sensors are appealing due to having several advantages, such as simple reading mechanisms, simple construction, and quick dynamic response. Achieving a constantly changeable microstructure of sensing materials is critical for the flexible pressure sensor and remains a difficulty. Herein, a flexible, tunable resistive pressure sensors is developed via simple, low-cost microsphere self-assembly and graphene/carbon nanotubes (CNTs) solution drop coating. The sensor uses polystyrene (PS) microspheres to construct an interlocked dome microstructure with graphene/CNTs as a conductive filler. The results indicate that the interlocked microdome-type pressure sensor has better sensitivity than the single microdome-type and single planar-type without surface microstructure. The pressure sensor’s sensitivity can be adjusted by varying the diameter of PS microspheres. In addition, the resistance of the sensor is also tunable by adjusting the number of graphene/CNT conductive coating layers. The developed flexible pressure sensor effectively detected human finger bending, demonstrating tremendous potential in human motion monitoring.

scholarly journals Correction: Zhang, P., et al. A Flexible Strain Sensor Based on the Porous Structure of a Carbon Black/Carbon Nanotube Conducting Network for Human Motion Detection. Sensors 2020, 20, 1154

Sensors ◽  
2020 ◽  
Vol 20 (10) ◽  
pp. 2901
Author(s):  
Peng Zhang ◽  
Yucheng Chen ◽  
Yuxia Li ◽  
Yao Zhang ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Carbon Black ◽  
Porous Structure ◽  
Black Carbon ◽  
Motion Detection ◽  
Strain Sensor ◽  
Human Motion ◽  
Human Motion Detection ◽  
Flexible Strain Sensor

The authors wish to make the following corrections to this paper [...]

A facile method to prepare a wearable pressure sensor based on fabric electrodes for human motion monitoring

2019 ◽  
Vol 89 (23-24) ◽  
pp. 5144-5152 ◽  
Author(s):  
Ronghui Wu ◽  
Liyun Ma ◽  
Aniruddha Balkrishna Patil ◽  
Chen Hou ◽  
Zhaohui Meng ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Information Transfer ◽  
Research Work ◽  
High Sensitivity ◽  
Human Motion ◽  
Pressing Method ◽  
Nylon Fabric ◽  
Flexible Pressure Sensor ◽  
Human Motion Monitoring ◽  
The Military

Intelligent textile that endow traditional fabric with functionalities have attracted increasing attention. In this research work, we fabricated a flexible and wearable pressure sensor with conductive nylon fabric as the electrodes and elastomer Ecoflex as the dielectric layer. The conductive nylon fabric in the twill structure, which showed a high conductivity of 0.268 Ω·cm (specific resistance), was prepared by magnetron sputtering with silver films. The flexible pressure sensor shows a high sensitivity of 0.035 kPa−1, a good linear response under pressure from 0 to 16 kPa, and a quick response time of 0.801 s. The fabricated pressure sensor was found to be highly reproducible and repeatable against repeated mechanical loads for 9500 times, with a small capacitance loss rate of 0.0534. The fabric-based flexible and wearable sensor with good properties can be incorporated into a fabric garment by the hot-pressing method without sacrificing comfort, which can then be used for human motion detecting or touch sensing. The smart glove with finger touch function was proved to be efficient in Morse code editing, which has potential for information transfer in the military field.

Flexible Pressure Sensor Based on Photo Paper-Molded Micro-Structural AgNWs/PDMS Electrode

2015 ◽  
Vol 748 ◽  
pp. 1-4 ◽  
Author(s):  
Li Xin Mo ◽  
Yu Qun Hou ◽  
Qing Bin Zhai ◽  
Wen Guan Zhang ◽  
Lu Hai Li
Keyword(s):  
Pressure Sensor ◽  
Silver Nanowires ◽  
Low Cost ◽  
Flexible Substrate ◽  
High Sensitivity ◽  
Low Energy ◽  
Capacitive Pressure Sensor ◽  
Micro Structure ◽  
Energy Consuming ◽  
Flexible Pressure Sensor

The novel flexible pressure sensor with skin-like stretchability and sensibility has attracted tremendous attention in academic and industrial world in recent years. And it also has demonstrated great potential in the applications of electronic skin and wearable devices. It is significant and challenging to develop a highly sensitive flexible pressure sensor with a simple, low energy consuming and low cost method. In this paper, the silver nanowires (AgNWs) as electrode material were synthesized by polyol process. The polydimethylsiloxane (PDMS) was chosen as a flexible substrate and polyimide (PI) film as dielectric layer. The AgNWs based electrode was prepared in two methods. One is coating the AgNWs on photographic paper followed by in situ PDMS curing. Another one is suction filtration of the AgNWs suspension followed by glass slide transfer and PDMS curing. Then the capacitive pressure sensor was packaged in a sandwich structure with two face to face electrodes and a PI film in the middle. The sensitivity of the sensor as well as the micro-structure of the electrodes was compared and studied. The results indicate that the roughness of the electrode based on AgNWs/PDMS micro-structure plays an important role in the sensitivity of sensor. The as-prepared flexible pressure sensor demonstrates high sensitivity of 0.65kPa-1. In addition, the fabrication method is simple, low energy consuming and low cost, which has great potential in the detection of pulse, heart rate, sound vibration and other tiny pressure.

Foot Pressure-Sensor System for Tracking Safety and Health

2014 ◽  
Vol 26 (1) ◽  
pp. 116-119
Author(s):  
Kenneth Shinozuka ◽  
Keyword(s):  
Pressure Sensor ◽  
Low Cost ◽  
Control Software ◽  
Foot Pressure ◽  
Gait Characteristics ◽  
Safety And Health ◽  
Audible Sound ◽  
Health Care Applications ◽  
Flexible Pressure Sensor ◽  
And Control

This paper presents an innovative pressure sensor systemembedded in a sock, which has a number of health care applications. One of these is the low-cost, reliable detection of the bed-departure of Alzheimer’s patients, an increasingly common problem that causes significant stress to caregivers. The system comprises a pressure sensor embedded in a sock and a coin battery-powered microcontroller containing a radiofrequency module. Once the user wanders out of bed and steps onto the floor, the sensor on the sock will immediately detect the pressure caused by his or her body weight and will wirelessly trigger an audible sound in a caregiver’s monitoring unit, which can be a Smartphone, tablet, or dedicated monitor. Furthermore, the pressure sensor and the microcontroller can be combined into one re-attachable unit, which can be stuck conveniently to the ball or heel of the user’s foot or any ordinary sock, slipper or shoe. In addition, the system can function as a highly accurate pedometer that is useful for monitoring the user’s health by tracking changes in his or her gait characteristics. In this study, a prototype sensor sock was developed that included an ultra-thin flexible pressure sensor, microcontroller, Bluetooth low energy module, and control software. The efficacy of the sensor sock in detecting and alerting patients’ wandering has been demonstrated.

scholarly journals Flexible Pressure Sensor with Micro-Structure Arrays Based on PDMS and PEDOT:PSS/PUD&CNTs Composite Film with 3D Printing

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6499
Author(s):  
Yiwei Shao ◽  
Qi Zhang ◽  
Yulong Zhao ◽  
Xing Pang ◽  
Mingjie Liu ◽  
...  
Keyword(s):  
3D Printing ◽  
Pressure Sensor ◽  
Pressure Sensors ◽  
Human Motion ◽  
Bottom Plate ◽  
Durability Test ◽  
Printing Technology ◽  
Digital Light Processing ◽  
3D Printing Technology ◽  
Flexible Pressure Sensor

Flexible pressure sensors are widely used in different fields, especially in human motion, robot monitoring and medical treatment. Herein, a flexible pressure sensor consists of the flat top plate, and the microstructured bottom plate is developed. Both plates are made of polydimethylsiloxane (PDMS) by molding from the 3D printed template. The contact surfaces of the top and bottom plates are coated with a mixture of poly (3,4-ethylenedioxythiophene) poly (styrene sulfonate) (PEDOT:PSS) and polyurethane dispersion (PUD) as stretchable film electrodes with carbon nanotubes on the electrode surface. By employing 3D printing technology, using digital light processing (DLP), the fabrication of the sensor is low-cost and fast. The sensor models with different microstructures are first analyzed by the Finite Element Method (FEM), and then the models are fabricated and tested. The sensor with 5 × 5 hemispheres has a sensitivity of 3.54 × 10−3 S/kPa in the range of 0–22.2 kPa. The zero-temperature coefficient is −0.0064%FS/°C. The durability test is carried out for 2000 cycles, and it remains stable during the whole test. This work represents progress in flexible pressure sensing and demonstrates the advantages of 3D printing technology in sensor processing.

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