scholarly journals A Flexible Pressure Sensor with Ink Printed Porous Graphene for Continuous Cardiovascular Status Monitoring

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 485
Author(s):  
Yuxin Peng ◽  
Jingzhi Zhou ◽  
Xian Song ◽  
Kai Pang ◽  
Akram Samy ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Flexible Electronics ◽  
Large Scale ◽  
Skin Surface ◽  
Great Sensitivity ◽  
Medical Community ◽  
Porous Graphene ◽  
Status Monitoring ◽  
Flexible Pressure Sensor ◽  
Large Scale Manufacture

Flexible electronics with continuous monitoring ability a extensively preferred in various medical applications. In this work, a flexible pressure sensor based on porous graphene (PG) is proposed for continuous cardiovascular status monitoring. The whole sensor is fabricated in situ by ink printing technology, which grants it the potential for large-scale manufacture. Moreover, to enhance its long-term usage ability, a polyethylene terephthalate/polyethylene vinylacetate (PET/EVA)-laminated film is employed to protect the sensor from unexpected shear forces on the skin surface. The sensor exhibits great sensitivity (53.99/MPa), high resolution (less than 0.3 kPa), wide detecting range (0.3 kPa to 1 MPa), desirable robustness, and excellent repeatability (1000 cycles). With the assistance of the proposed pressure sensor, vital cardiovascular conditions can be accurately monitored, including heart rate, respiration rate, pulse wave velocity, and blood pressure. Compared to other sensors based on self-supporting 2D materials, this sensor can endure more complex environments and has enormous application potential for the medical community.

A Full Printed Flexible Pressure Sensor with Improved Temperature Performance based on Optimized Curing Mechanism

2021 ◽  
Author(s):  
Jingnan Ma ◽  
Mengmeng Liang ◽  
Wei Wang
Keyword(s):  
High Temperature ◽  
Pressure Sensor ◽  
Flexible Electronics ◽  
Material Selection ◽  
Pressure Sensors ◽  
Functional Materials ◽  
Temperature Performance ◽  
Curing Mechanism ◽  
Flexible Pressure Sensor ◽  
Flexible Pressure Sensors

Printable flexible pressure sensors have many important applications in wearable systems. One major challenge of such a sensor is to maintain sensing properties in high temperature. By optimizing the curing mechanism of the flexible pressure sensor functional materials, this paper proposes a new method of achieving high temperature properties for a full printed sensor. The establishment of curing theory is mainly studied. The printing process of this kind of sensor is systematically stated and tested to check whether it can continue to function at high temperatures. Ultimately a fully-printed flexible pressure sensor with good temperature performance is achieved. The paper focuses around the technical route of “material selection—theoretical analysis —function material preparation—design and preparation of device—device performance evaluation”. Suitable materials are used in flexible pressure sensors and the curing mechanism is established. This proposed technique can be extended to the development of other printable flexible sensors, which can lead to a huge impact on future applications of the flexible electronics.

scholarly journals A High Sensitive Flexible Pressure Sensor Designed by Silver Nanowires Embedded in Polyimide (AgNW-PI)

Micromachines ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 206 ◽  
Author(s):  
Hongfang Li ◽  
Guifu Ding ◽  
Zhuoqing Yang
Keyword(s):  
Pressure Sensor ◽  
Flexible Electronics ◽  
Silver Nanowires ◽  
Low Cost ◽  
Synthesis Method ◽  
High Sensitivity ◽  
Face To Face ◽  
Ultrathin Layers ◽  
Flexible Pressure Sensor

Silver nanowires (AgNW) have excellent electrical conductivity, transparency, and flexing endurance, and are broadly used in flexible electrodes and flexible sensors. This study mixed the silver nanowires and polyimide (PI) polymer using an in situ synthesis method, effectively reducing the problem of silver nanowires falling off the substrate. The selective wet etching method was firstly used to process the surface of AgNW-PI films, greatly enhancing the surface conductivity of AgNW-PI films. A flexible pressure sensor with high sensitivity was designed with two face-to-face AgNW-PI ultrathin layers. The experimental results show that our sensor presented a high sensitivity of about 1.3294 kPa−1 under a pressure of about 600 Pa, and when pressure continued to increase, the sensitivity decreased rapidly and reached saturation. Our flexible pressure sensor has the properties of low cost, high sensitivity, excellent repeatability, durability, and can detect various types of mechanical forces which could be utilized for flexible electronics.

An ultrasensitive flexible pressure sensor for multimodal wearable electronic skins based on large-scale polystyrene ball@reduced graphene-oxide core–shell nanoparticles

2018 ◽  
Vol 6 (20) ◽  
pp. 5514-5520 ◽  
Author(s):  
Yuanfei Ai ◽  
Ting Heng Hsu ◽  
Ding Chou Wu ◽  
Ling Lee ◽  
Jyun-Hong Chen ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
High Performance ◽  
Large Scale ◽  
Shell Nanoparticles ◽  
Flexible Film ◽  
Reduced Graphene ◽  
Wearable Electronic ◽  
Flexible Pressure Sensor ◽  
Core Shell Nanoparticles ◽  
Type Pressure

In this study, we report the fabrication of a flexible film shaped resistive-type pressure sensor with high performance and versatile applications.

Flexible pressure sensor based on cigarette filter and highly conductive MXene sheets

2021 ◽  
pp. 100889
Author(s):  
Ran Li ◽  
Xiaohan Tian ◽  
Min Wei ◽  
Aijun Dong ◽  
Xi Pan ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Cigarette Filter ◽  
Flexible Pressure Sensor

scholarly journals Metachronal waves in magnetic micro-robotic paddles for artificial cilia

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Matthew T. Bryan ◽  
Elizabeth L. Martin ◽  
Aleksandra Pac ◽  
Andrew D. Gilbert ◽  
Feodor Y. Ogrin
Keyword(s):  
Large Scale ◽  
Point Of Care ◽  
Hydrodynamic Response ◽  
Flow Speeds ◽  
Break Time ◽  
Large Scale Manufacture ◽  
Fresh Insight ◽  
Metachronal Waves ◽  
Insight Into ◽  
Phase Differences

AbstractBiological cilia generate fluid movement within viscosity-dominated environments using beating motions that break time-reversal symmetry. This creates a metachronal wave, which enhances flow efficiency. Artificially mimicking this behaviour could improve microfluidic point-of-care devices, since viscosity-dominated fluid dynamics impede fluid flow and mixing of reagents, limiting potential for multiplexing diagnostic tests. However, current biomimicry schemes require either variation in the hydrodynamic response across a cilia array or a complex magnetic anisotropy configuration to synchronise the actuation sequence with the driving field. Here, we show that simple modifications to the structural design introduce phase differences between individual actuators, leading to the spontaneous formation of metachronal waves. This generates flow speeds of up to 16 μm/s as far as 675 μm above the actuator plane. By introducing metachronal waves through lithographic structuring, large scale manufacture becomes feasible. Additionally, by demonstrating that metachronal waves emerge from non-uniformity in internal structural mechanics, we offer fresh insight into the mechanics of cilia coordination.

Preparation of Conductive Nanosilver Ink and its Application on RFID Tags

2014 ◽  
Vol 904 ◽  
pp. 121-125 ◽  
Author(s):  
Ji Lan Fu ◽  
Ya Ling Li ◽  
Li Xin Mo ◽  
Yu Wang ◽  
Jun Ran ◽  
...  
Keyword(s):  
Flexible Electronics ◽  
Screen Printing ◽  
Surface Resistance ◽  
Large Scale ◽  
Printed Electronics ◽  
Silver Content ◽  
Rfid Tags ◽  
Rheological Characteristics ◽  
Conductive Ink ◽  
New Type

The recent dramatic progress in the printed electronics and flexible electronics, due to the universality of the substrates including the foldable and stretchable substrates, has opened a new prospect in the field of future electronics. In this paper, silver nanospheres in large-scale are synthesized, the nanosilver ink with 63.88% silver content are prepared and a new type of highly conductive and far identify distance RFID tags are manufactured. Especially there are no resin and other additives containing in our conductive ink which satisfy the rheological characteristics and process of screen printing. The tags exhibit the best radiation performance own to there is no high temperature sintering in need. The surface resistance of the tags could be 80 mΩ/, and the identify distance reach to 6.0m. Keywords:silver nanoparticles, conductive ink, RFID tags

Sign in / Sign up

Export Citation Format

Share Document