3D Printing of Highly Sensitive and Large-Measurement-Range Flexible Pressure Sensors with a Positive Piezoresistive Effect

2020 ◽  
Vol 12 (25) ◽  
pp. 28669-28680 ◽  
Author(s):  
Zhenhua Tang ◽  
Shuhai Jia ◽  
Chenghao Zhou ◽  
Bo Li
Keyword(s):  
3D Printing ◽  
Pressure Sensors ◽  
Measurement Range ◽  
Piezoresistive Effect ◽  
Highly Sensitive ◽  
Large Measurement ◽  
Flexible Pressure Sensors

scholarly journals Influence of the Porosity of Polymer Foams on the Performances of Capacitive Flexible Pressure Sensors

Sensors ◽  
2019 ◽  
Vol 19 (9) ◽  
pp. 1968 ◽  
Author(s):  
Sylvie Bilent ◽  
Thi Hong Nhung Dinh ◽  
Emile Martincic ◽  
Pierre-Yves Joubert
Keyword(s):  
Experimental Data ◽  
Linear Model ◽  
Dielectric Material ◽  
Pressure Sensors ◽  
Volume Ratio ◽  
Measurement Range ◽  
Polymer Foams ◽  
First Order ◽  
Non Linear ◽  
Flexible Pressure Sensors

This paper reports on the study of microporous polydimethylsiloxane (PDMS) foams as a highly deformable dielectric material used in the composition of flexible capacitive pressure sensors dedicated to wearable use. A fabrication process allowing the porosity of the foams to be adjusted was proposed and the fabricated foams were characterized. Then, elementary capacitive pressure sensors (15 × 15 mm2 square shaped electrodes) were elaborated with fabricated foams (5 mm or 10 mm thick) and were electromechanically characterized. Since the sensor responses under load are strongly non-linear, a behavioral non-linear model (first order exponential) was proposed, adjusted to the experimental data, and used to objectively estimate the sensor performances in terms of sensitivity and measurement range. The main conclusions of this study are that the porosity of the PDMS foams can be adjusted through the sugar:PDMS volume ratio and the size of sugar crystals used to fabricate the foams. Additionally, the porosity of the foams significantly modified the sensor performances. Indeed, compared to bulk PDMS sensors of the same size, the sensitivity of porous PDMS sensors could be multiplied by a factor up to 100 (the sensitivity is 0.14 %.kPa−1 for a bulk PDMS sensor and up to 13.7 %.kPa−1 for a porous PDMS sensor of the same dimensions), while the measurement range was reduced from a factor of 2 to 3 (from 594 kPa for a bulk PDMS sensor down to between 255 and 177 kPa for a PDMS foam sensor of the same dimensions, according to the porosity). This study opens the way to the design and fabrication of wearable flexible pressure sensors with adjustable performances through the control of the porosity of the fabricated PDMS foams.

Highly sensitive and stable flexible pressure sensors with micro-structured electrodes

2017 ◽  
Vol 699 ◽  
pp. 824-831 ◽  
Author(s):  
Yong Quan ◽  
Xiongbang Wei ◽  
Lun Xiao ◽  
Tao Wu ◽  
Hanying Pang ◽  
...  
Keyword(s):  
Pressure Sensors ◽  
Highly Sensitive ◽  
Flexible Pressure Sensors

scholarly journals A Highly Sensitive and Flexible Capacitive Pressure Sensor Based on a Porous Three-Dimensional PDMS/Microsphere Composite

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1412 ◽  
Author(s):  
Young Jung ◽  
Wookjin Lee ◽  
Kyungkuk Jung ◽  
Byunggeon Park ◽  
Jinhyoung Park ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Sacrificial Layer ◽  
Three Dimensional ◽  
Pressure Sensors ◽  
Capacitive Pressure Sensor ◽  
Mechanical Stimuli ◽  
Highly Sensitive ◽  
Flexible Pressure Sensors ◽  
Fast Rise ◽  
Better Than

In recent times, polymer-based flexible pressure sensors have been attracting a lot of attention because of their various applications. A highly sensitive and flexible sensor is suggested, capable of being attached to the human body, based on a three-dimensional dielectric elastomeric structure of polydimethylsiloxane (PDMS) and microsphere composite. This sensor has maximal porosity due to macropores created by sacrificial layer grains and micropores generated by microspheres pre-mixed with PDMS, allowing it to operate at a wider pressure range (~150 kPa) while maintaining a sensitivity (of 0.124 kPa−1 in a range of 0~15 kPa) better than in previous studies. The maximized pores can cause deformation in the structure, allowing for the detection of small changes in pressure. In addition to exhibiting a fast rise time (~167 ms) and fall time (~117 ms), as well as excellent reproducibility, the fabricated pressure sensor exhibits reliability in its response to repeated mechanical stimuli (2.5 kPa, 1000 cycles). As an application, we develop a wearable device for monitoring repeated tiny motions, such as the pulse on the human neck and swallowing at the Adam’s apple. This sensory device is also used to detect movements in the index finger and to monitor an insole system in real-time.

Ultrathin Nanofibrous Membranes Containing Insulating Microbeads for Highly Sensitive Flexible Pressure Sensors

2020 ◽  
Vol 12 (11) ◽  
pp. 13348-13359 ◽  
Author(s):  
Taiyu Jin ◽  
Yan Pan ◽  
Guk-Jin Jeon ◽  
Hye-In Yeom ◽  
Shuye Zhang ◽  
...  
Keyword(s):  
Pressure Sensors ◽  
Highly Sensitive ◽  
Nanofibrous Membranes ◽  
Flexible Pressure Sensors

scholarly journals Ultra-Sensitive Flexible Tactile Sensor Based on Graphene Film

Micromachines ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 730 ◽  
Author(s):  
Xiaozhou Lü ◽  
Liang Qi ◽  
Hanlun Hu ◽  
Xiaoping Li ◽  
Guanghui Bai ◽  
...  
Keyword(s):  
Industrial Robot ◽  
Graphene Film ◽  
High Sensitivity ◽  
Tactile Sensor ◽  
Measurement Range ◽  
Tactile Sensors ◽  
Piezoresistive Effect ◽  
Large Measurement ◽  
Pet Film ◽  
Maximum Measurement

Flexible tactile sensor can be integrated into artificial skin and applied in industrial robot and biomedical engineering. However, the presented tactile sensors still have challenge in increasing sensitivity to expand the sensor’s application. Aiming at this problem, this paper presents an ultra-sensitive flexible tactile sensor. The sensor is based on piezoresistive effect of graphene film and is composed of upper substrate (PDMS bump with a size of 5 mm × 7 mm and a thickness of 1 mm), medial Graphene/PET film (Graphene/PET film with a size of 5 mm × 7 mm, PET with a hardness of 2H) and lower substrate (PI with fabricated electrodes). We presented the structure and reduced the principle of the sensor. We also fabricated several sample devices of the sensor and carried out experiment to test the performance. The results show that the sensor performed an ultra high sensitivity of 10.80/kPa at the range of 0–4 kPa and have a large measurement range up to 600 kPa. The sensor has 4 orders of magnitude between minimum resolution and maximum measurement range which have great advantage compared with state of the art. The sensor is expected to have great application prospect in robot and biomedical.

Self-powered flexible pressure sensors with vertically well-aligned piezoelectric nanowire arrays for monitoring vital signs

2015 ◽  
Vol 3 (45) ◽  
pp. 11806-11814 ◽  
Author(s):  
Xiaoliang Chen ◽  
Jinyou Shao ◽  
Ningli An ◽  
Xiangming Li ◽  
Hongmiao Tian ◽  
...  
Keyword(s):  
Pressure Sensors ◽  
Vital Signs ◽  
Nanowire Arrays ◽  
Highly Sensitive ◽  
Polarization Orientation ◽  
Self Powered ◽  
Flexible Pressure Sensors

We propose an in situ poling of vertically well-aligned piezoelectric nanowire arrays with preferential polarization orientation as highly sensitive self-powered sensors for monitoring vital signs.

Facile fabrication of highly sensitive and durable cotton fabric-based pressure sensors for motion and pulse monitoring

2021 ◽  
Author(s):  
Yinan Zhao ◽  
Lin Liu ◽  
zhen Li ◽  
Feifei Wang ◽  
Xinxin Chen ◽  
...  
Keyword(s):  
Cotton Fabric ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Wearable Electronics ◽  
Term Stability ◽  
Long Term Stability ◽  
Highly Sensitive ◽  
Facile Fabrication ◽  
Flexible Pressure Sensors

Design and development of flexible pressure sensors with high sensitivity, long-term stability and simple fabrication processes is a key procedure to fulfill the applications in wearable electronics, e-skin and medical...

Highly sensitive flexible pressure sensors with microstructured rubber dielectric layers

2010 ◽  
Vol 9 (10) ◽  
pp. 859-864 ◽  
Author(s):  
Stefan C. B. Mannsfeld ◽  
Benjamin C-K. Tee ◽  
Randall M. Stoltenberg ◽  
Christopher V. H-H. Chen ◽  
Soumendra Barman ◽  
...  
Keyword(s):  
Pressure Sensors ◽  
Dielectric Layers ◽  
Highly Sensitive ◽  
Flexible Pressure Sensors

Highly sensitive digital optical sensor with large measurement range based on the dual-microring resonator with waveguide-coupled feedback

2014 ◽  
Vol 23 (3) ◽  
pp. 034206 ◽  
Author(s):  
Xing-Ye Xiang ◽  
Kui-Ru Wang ◽  
Jin-Hui Yuan ◽  
Bo-Yuan Jin ◽  
Xin-Zhu Sang ◽  
...  
Keyword(s):  
Optical Sensor ◽  
Measurement Range ◽  
Microring Resonator ◽  
Highly Sensitive ◽  
Large Measurement
Sign in / Sign up

Export Citation Format

Share Document