scholarly journals Piezoresistive Sensors: Full 3D Printing of Stretchable Piezoresistive Sensor with Hierarchical Porosity and Multimodulus Architecture (Adv. Funct. Mater. 11/2019)

2019 ◽  
Vol 29 (11) ◽  
pp. 1970067
Author(s):  
Ziya Wang ◽  
Xiao Guan ◽  
Huayi Huang ◽  
Haifei Wang ◽  
Waner Lin ◽  
...  
Keyword(s):  
3D Printing ◽  
Hierarchical Porosity ◽  
Piezoresistive Sensors ◽  
Piezoresistive Sensor

Full 3D Printing of Stretchable Piezoresistive Sensor with Hierarchical Porosity and Multimodulus Architecture

2018 ◽  
Vol 29 (11) ◽  
pp. 1807569 ◽  
Author(s):  
Ziya Wang ◽  
Xiao Guan ◽  
Huayi Huang ◽  
Haifei Wang ◽  
Waner Lin ◽  
...  
Keyword(s):  
3D Printing ◽  
Hierarchical Porosity ◽  
Piezoresistive Sensor

Highly accurate fabric piezoresistive sensor with anti-interference of both high humidity and sweat based on hydrophobic non-fluoride titanium dioxide nanoparticle

2021 ◽  
Author(s):  
Liyan Yang ◽  
Jun Ma ◽  
Weibing Zhong ◽  
Qiongzhen Liu ◽  
Mu fang Li ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Conductive Polymers ◽  
Human Motion ◽  
High Humidity ◽  
Titanium Dioxide Nanoparticle ◽  
Piezoresistive Sensors ◽  
Piezoresistive Sensor

The fabric-based piezoresistive sensors have demonstrated great potentials in the application of human motion and health detection. However, the conductive polymers of the sensing units are easily influenced by high...

scholarly journals Evaluation of Joint Motion Sensing Efficiency According to the Implementation Method of SWCNT-Coated Fabric Motion Sensor

Sensors ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 284 ◽  
Author(s):  
Hyun-Seung Cho ◽  
Jin-Hee Yang ◽  
Jeong-Hwan Lee ◽  
Joo-Hyeon Lee
Keyword(s):  
Motion Sensor ◽  
Joint Motion ◽  
Motion Sensors ◽  
Motion Sensing ◽  
Piezoresistive Sensors ◽  
Piezoresistive Sensor ◽  
Acceleration Sensors ◽  
Flexion Extension ◽  
Joint Motions ◽  
Walled Carbon Nanotubes

The purpose of this study was to investigate the effects of the shape and attachment position of stretchable textile piezoresistive sensors coated with single-walled carbon nanotubes on their performance in measuring the joint movements of children. The requirements for fabric motion sensors suitable for children are also identified. The child subjects were instructed to wear integrated clothing with sensors of different shapes (rectangular and boat-shaped), attachment positions (at the knee and elbow joints or 4 cm below the joints). The change in voltage caused by the elongation and contraction of the fabric sensors was measured for the flexion-extension motions of the arms and legs at 60°/s (three measurements of 10 repetitions each for the 60° and 90° angles, for a total of 60 repetitions). Their reliability was verified by analyzing the agreement between the fabric motion sensors and attached acceleration sensors. The experimental results showed that the fabric motion sensor that can measure children’s arm and leg motions most effectively is the rectangular-shaped sensor attached 4 cm below the joint. In this study, we developed a textile piezoresistive sensor suitable for measuring the joint motion of children, and analyzed the shape and attachment position of the sensor on clothing suitable for motion sensing. We showed that it is possible to sense joint motions of the human body by using flexible fabric sensors integrated into clothing.

Noise Mitigation Techniques for Carbon Nanotube-Based Piezoresistive Sensor Systems

2011 ◽  
Vol 1303 ◽  
Author(s):  
Michael A. Cullinan ◽  
Martin L. Culpepper
Keyword(s):  
Carbon Nanotube ◽  
Dynamic Range ◽  
Flicker Noise ◽  
Sensor System ◽  
Strain Sensitivity ◽  
Mems Devices ◽  
Noise Mitigation ◽  
Piezoresistive Sensors ◽  
Piezoresistive Sensor ◽  
Mitigation Techniques

ABSTRACTCarbon nanotube (CNT)-based piezoresistive strain sensors have the potential to outperform traditional silicon-based piezoresistors in MEMS devices due to their high strain sensitivity. However, the resolution of CNT-based piezoresistive sensors is currently limited by excessive 1/f or flicker noise. In this paper we will demonstrate several noise mitigation techniques that can be used to decrease noise in the CNT-based sensor system without reducing the sensor’s strain sensitivity. First, the CNTs were placed in a parallel resistor network to increase the total number of charge carriers in the sensor system. By carefully selecting the types of CNTs used in the sensor system and by correctly designing the system it is possible to reduce the noise in the sensor system without reducing sensitivity. The CNTs were also coated with aluminum oxide to help protect the CNTs from environmental variations. Finally, the CNTs were annealed to improve contact resistance and to remove adsorbates from the CNT sidewall. Overall, using these noise mitigation techniques it is possible to reduce the total noise in the sensor system by almost two orders of magnitude and increase the dynamic range of the sensors by 29 dB.

Varistor Characteristic Analysis of the Piezoresistive Sensors

2014 ◽  
Vol 494-495 ◽  
pp. 997-1000
Author(s):  
Yun Bo Shi ◽  
Xiang Li
Keyword(s):  
Cantilever Beam ◽  
Simulation Analysis ◽  
Great Influence ◽  
Theoretical Models ◽  
Optimal Choice ◽  
Ansys Software ◽  
Characteristic Analysis ◽  
Piezoresistive Sensors ◽  
Piezoresistive Sensor ◽  
Stress Simulation

In the process of the piezoresistive sensor design, the placement of varistor has a great influence on the sensitivity of the sensor.In this paper, three theoretical models of piezoresistive sensor are established.The stress simulation analysis of the different varistor path way placed on the cantilever beam is conducted in Ansys software. The sensitivities of the axis and transverse direction are calcuated and compared by Matlab compiler. The results show that the placement of varistor which is parallel to the cantilever beam is the most optimal choice.

scholarly journals Direct printing of functional 3D objects using polymerization-induced phase separation

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Bhavana Deore ◽  
Kathleen L. Sampson ◽  
Thomas Lacelle ◽  
Nathan Kredentser ◽  
Jacques Lefebvre ◽  
...  
Keyword(s):  
Phase Separation ◽  
3D Printing ◽  
Functional Properties ◽  
Dissimilar Materials ◽  
Functional Coatings ◽  
Piezoresistive Sensors ◽  
Multiple Materials ◽  
Manufacturing Techniques ◽  
Traditional Manufacturing ◽  
Spatial Positioning

Abstract3D printing has enabled materials, geometries and functional properties to be combined in unique ways otherwise unattainable via traditional manufacturing techniques, yet its adoption as a mainstream manufacturing platform for functional objects is hindered by the physical challenges in printing multiple materials. Vat polymerization offers a polymer chemistry-based approach to generating smart objects, in which phase separation is used to control the spatial positioning of materials and thus at once, achieve desirable morphological and functional properties of final 3D printed objects. This study demonstrates how the spatial distribution of different material phases can be modulated by controlling the kinetics of gelation, cross-linking density and material diffusivity through the judicious selection of photoresin components. A continuum of morphologies, ranging from functional coatings, gradients and composites are generated, enabling the fabrication of 3D piezoresistive sensors, 5G antennas and antimicrobial objects and thus illustrating a promising way forward in the integration of dissimilar materials in 3D printing of smart or functional parts.

scholarly journals Nanomanufacturing Methods for the Reduction of Noise in Carbon Nanotube-Based Piezoresistive Sensor Systems

2013 ◽  
Vol 1 (1) ◽  
Author(s):  
Michael A. Cullinan ◽  
Martin L. Culpepper
Keyword(s):  
Carbon Nanotube ◽  
Dynamic Range ◽  
Flicker Noise ◽  
Sensor System ◽  
Strain Sensitivity ◽  
Mems Devices ◽  
Noise Mitigation ◽  
Piezoresistive Sensors ◽  
Piezoresistive Sensor ◽  
Total Noise

Carbon nanotube (CNT)-based piezoresistive strain sensors have the potential to outperform traditional silicon-based piezoresistors in MEMS devices due to their high strain sensitivity. However, the resolution of CNT-based piezoresistive sensors is currently limited by excessive 1/f or flicker noise. In this paper, we will demonstrate several nanomanufacturing methods that can be used to decrease noise in the CNT-based sensor system without reducing the sensor's strain sensitivity. First, the CNTs were placed in a parallel resistor network to increase the total number of charge carriers in the sensor system. By carefully selecting the types of CNTs used in the sensor system and by correctly designing the system, it is possible to reduce the noise in the sensor system without reducing sensitivity. The CNTs were also coated with aluminum oxide to help protect the CNTs from environmental effects. Finally, the CNTs were annealed to improve contact resistance and to remove adsorbates from the CNT sidewall. The optimal annealing conditions were determined using a design-of-experiments (DOE). Overall, using these noise mitigation techniques it is possible to reduce the total noise in the sensor system by almost 3 orders of magnitude and increase the dynamic range of the sensors by 48 dB.

scholarly journals Hydrogel-based piezoresistive sensor for the detection of ethanol

2018 ◽  
Vol 7 (1) ◽  
pp. 219-226 ◽  
Author(s):  
Jan Erfkamp ◽  
Margarita Guenther ◽  
Gerald Gerlach
Keyword(s):  
Response Time ◽  
Low Cost ◽  
High Sensitivity ◽  
Alcoholic Beverages ◽  
Swelling Kinetics ◽  
Short Response Time ◽  
Piezoresistive Sensors ◽  
Piezoresistive Sensor ◽  
Crosslinker Content ◽  
Kinetics Of

Abstract. This article describes a low-cost sensor for the detection of ethanol in alcoholic beverages, which combines alcohol-sensitive hydrogels based on acrylamide and bisacrylamide and piezoresistive sensors. For reproducible measurements, the reversible swelling and deswelling of the hydrogel were shown via microscopy. The response time of the sensor depends on the swelling kinetics of the hydrogel. The selectivity of the hydrogel was tested in different alcohols. In order to understand the influence of monomer and crosslinker content on the swelling degree and on the sensitivity of the hydrogels, gels with variable concentrations of acrylamide and bisacrylamide were synthesized and characterized in different aqueous solutions with alcohol contents. The first measurements of such hydrogel-based piezoresistive ethanol sensors demonstrated a high sensitivity and a short response time over several measuring cycles.

3D Printing of Artificial Leaf with Tunable Hierarchical Porosity for CO2 Photoreduction

2018 ◽  
Vol 30 (3) ◽  
pp. 799-806 ◽  
Author(s):  
Liao Chen ◽  
Xingwei Tang ◽  
Peiwen Xie ◽  
Jun Xu ◽  
Zhihan Chen ◽  
...  
Keyword(s):  
3D Printing ◽  
Co2 Photoreduction ◽  
Hierarchical Porosity
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