scholarly journals The Effect of Encapsulation on Crack-Based Wrinkled Thin Film Soft Strain Sensors

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 364
Author(s):  
Thao Nguyen ◽  
Michael Chu ◽  
Robin Tu ◽  
Michelle Khine
Keyword(s):  
Thin Film ◽  
Large Scale ◽  
Crack Formation ◽  
Dynamic Range ◽  
Body Movement ◽  
Crack Density ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Signal Recovery ◽  
Increased Sensitivity

Practical wearable applications of soft strain sensors require sensors capable of not only detecting subtle physiological signals, but also of withstanding large scale deformation from body movement. Encapsulation is one technique to protect sensors from both environmental and mechanical stressors. We introduced an encapsulation layer to crack-based wrinkled metallic thin film soft strain sensors as an avenue to improve sensor stretchability, linear response, and robustness. We demonstrate that encapsulated sensors have increased mechanical robustness and stability, displaying a significantly larger linear dynamic range (~50%) and increased stretchability (260% elongation). Furthermore, we discovered that these sensors have post-fracture signal recovery. They maintained conductivity to the 50% strain with stable signal and demonstrated increased sensitivity. We studied the crack formation behind this phenomenon and found encapsulation to lead to higher crack density as the source for greater stretchability. As crack formation plays an important role in subsequent electrical resistance, understanding the crack evolution in our sensors will help us better address the trade-off between high stretchability and high sensitivity.

scholarly journals Combining High Sensitivity and Dynamic Range: Wearable Thin-Film Composite Strain Sensors of Graphene, Ultrathin Palladium, and PEDOT:PSS

2019 ◽  
Vol 2 (4) ◽  
pp. 2222-2229 ◽  
Author(s):  
Julian Ramírez ◽  
Daniel Rodriquez ◽  
Armando D. Urbina ◽  
Anne M. Cardenas ◽  
Darren J. Lipomi
Keyword(s):  
Thin Film ◽  
Dynamic Range ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Film Composite ◽  
Thin Film Composite ◽  
Composite Strain

Laser-engraved carbon nanotube paper for instilling high sensitivity, high stretchability, and high linearity in strain sensors

Nanoscale ◽  
2017 ◽  
Vol 9 (30) ◽  
pp. 10897-10905 ◽  
Author(s):  
Yangyang Xin ◽  
Jian Zhou ◽  
Xuezhu Xu ◽  
Gilles Lubineau
Keyword(s):  
Carbon Nanotube ◽  
Crack Density ◽  
High Sensitivity ◽  
Strain Sensors ◽  
High Linearity ◽  
High Crack ◽  
Ultrahigh Sensitivity

Sensors based on carbon nanotube papers with high crack density can attain ultrahigh sensitivity, high stretchability and high linearity.

scholarly journals Highly Sensitive and Stretchable c-MWCNTs/PPy Embedded Multidirectional Strain Sensor Based on Double Elastic Fabric for Human Motion Detection

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2333
Author(s):  
Huiying Shen ◽  
Huizhen Ke ◽  
Jingdong Feng ◽  
Chenyu Jiang ◽  
Qufu Wei ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Large Scale ◽  
Strain Sensor ◽  
High Sensitivity ◽  
Human Motion ◽  
Strain Sensors ◽  
Gauge Factor ◽  
Wearable Electronics ◽  
Synovial Joint ◽  
Human Motion Detection

Owing to the multi-dimensional complexity of human motions, traditional uniaxial strain sensors lack the accuracy in monitoring dynamic body motions working in different directions, thus multidirectional strain sensors with excellent electromechanical performance are urgently in need. Towards this goal, in this work, a stretchable biaxial strain sensor based on double elastic fabric (DEF) was developed by incorporating carboxylic multi-walled carbon nanotubes(c-MWCNTs) and polypyrrole (PPy) into fabric through simple, scalable soaking and adsorption-oxidizing methods. The fabricated DEF/c-MWCNTs/PPy strain sensor exhibited outstanding anisotropic strain sensing performance, including relatively high sensitivity with the maximum gauge factor (GF) of 5.2, good stretchability of over 80%, fast response time < 100 ms, favorable electromechanical stability, and durability for over 800 stretching–releasing cycles. Moreover, applications of DEF/c-MWCNTs/PPy strain sensor for wearable devices were also reported, which were used for detecting human subtle motions and dynamic large-scale motions. The unconventional applications of DEF/c-MWCNTs/PPy strain sensor were also demonstrated by monitoring complex multi-degrees-of-freedom synovial joint motions of human body, such as neck and shoulder movements, suggesting that such materials showed a great potential to be applied in wearable electronics and personal healthcare monitoring.

scholarly journals Genome-scale CRISPR screening at high sensitivity with an empirically designed sgRNA library

BMC Biology ◽  
2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Luisa Henkel ◽  
Benedikt Rauscher ◽  
Barbara Schmitt ◽  
Jan Winter ◽  
Michael Boutros
Keyword(s):  
Large Scale ◽  
Dynamic Range ◽  
High Sensitivity ◽  
Cell Types ◽  
Functional Dependencies ◽  
Protein Coding ◽  
Cell Clones ◽  
Experimental Implementation ◽  
Numerous Cell ◽  
Genome Scale

Abstract Background In recent years, large-scale genetic screens using the CRISPR/Cas9 system have emerged as scalable approaches able to interrogate gene function with unprecedented efficiency and specificity in various biological contexts. By this means, functional dependencies on both the protein-coding and noncoding genome of numerous cell types in different organisms have been interrogated. However, screening designs vary greatly and criteria for optimal experimental implementation and library composition are still emerging. Given their broad utility in functionally annotating genomes, the application and interpretation of genome-scale CRISPR screens would greatly benefit from consistent and optimal design criteria. Results We report advantages of conducting viability screens in selected Cas9 single-cell clones in contrast to Cas9 bulk populations. We further systematically analyzed published CRISPR screens in human cells to identify single-guide (sg) RNAs with consistent high on-target and low off-target activity. Selected guides were collected in a novel genome-scale sgRNA library, which efficiently identifies core and context-dependent essential genes. Conclusion We show how empirically designed libraries in combination with an optimized experimental design increase the dynamic range in gene essentiality screens at reduced library coverage.

High Sensitivity Plasmonic Sensing of Hydrogen over a Broad Dynamic Range Using Catalytic Au-CeO2 Thin Film Nanocomposites

ACS Sensors ◽  
2018 ◽  
Vol 3 (12) ◽  
pp. 2684-2692 ◽  
Author(s):  
Nora M. Houlihan ◽  
Nicholas Karker ◽  
Radislav A. Potyrailo ◽  
Michael A. Carpenter
Keyword(s):  
Thin Film ◽  
Dynamic Range ◽  
High Sensitivity ◽  
Plasmonic Sensing ◽  
Broad Dynamic Range ◽  
Film Nanocomposites

Flexible and Transparant Pressure Sensor Based on Pyramidal Elastomer with High Conducting Graphene Thin Film

2015 ◽  
Vol 738-739 ◽  
pp. 144-147
Author(s):  
Xiao Xiang Zhang ◽  
Song Tao Hu ◽  
Khan Qasim ◽  
Ba Long
Keyword(s):  
Thin Film ◽  
Carbon Nanotubes ◽  
Pressure Sensor ◽  
Dynamic Range ◽  
High Sensitivity ◽  
Single Wall Carbon Nanotubes ◽  
Effective Technique ◽  
Resistance Variation ◽  
Measured Resistance ◽  
Compressive Tests

A novel and effective technique was devised for synthesizing a pressure sensor based thermal plastic polyuthane (TPU) by covered a layer of less contineous graphene plus single wall carbon nanotubes (SWCNTs). Measured resistance versus deformation responses of the composites under compression, The resistance variation under compressive deformation dynamic range from several KPa to 0.5 MPa on the pyramid arrays shows high sensitivity. the piezoresistance repeatability under multiple compressive tests is reliable. Investigate the electromechanical response of the pressure sensor It was found that the elastomer exhibit a distinct relative of resistance versus stress in the regime of elastic deformation.

Miniaturised thin film conductometric biosensors with high dynamic range and high sensitivity

1997 ◽  
Vol 44 (1-3) ◽  
pp. 365-369 ◽  
Author(s):  
A. Steinschaden ◽  
D. Adamovic ◽  
G. Jobst ◽  
R. Glatz ◽  
G. Urban
Keyword(s):  
Thin Film ◽  
Dynamic Range ◽  
High Sensitivity ◽  
High Dynamic Range ◽  
High Dynamic

scholarly journals Thin Films Sensor Devices for Mycotoxins Detection in Foods: Applications and Challenges

Chemosensors ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 3 ◽  
Author(s):  
Andréia Santos ◽  
Andreia Vaz ◽  
Paula Rodrigues ◽  
Ana Veloso ◽  
Armando Venâncio ◽  
...  
Keyword(s):  
Thin Film ◽  
High Performance ◽  
Large Scale ◽  
Low Cost ◽  
Animal Health ◽  
High Sensitivity ◽  
Enzyme Linked Immunosorbent Assay ◽  
Film Sensor ◽  
Fast Analysis ◽  
Sensor Devices

Mycotoxins are a group of secondary metabolites produced by different species of filamentous fungi and pose serious threats to food safety due to their serious human and animal health impacts such as carcinogenic, teratogenic and hepatotoxic effects. Conventional methods for the detection of mycotoxins include gas chromatography and high-performance liquid chromatography coupled with mass spectrometry or other detectors (fluorescence or UV detection), thin layer chromatography and enzyme-linked immunosorbent assay. These techniques are generally straightforward and yield reliable results; however, they are time-consuming, require extensive preparation steps, use large-scale instruments, and consume large amounts of hazardous chemical reagents. Rapid detection of mycotoxins is becoming an increasingly important challenge for the food industry in order to effectively enforce regulations and ensure the safety of food and feed. In this sense, several studies have been done with the aim of developing strategies to detect mycotoxins using sensing devices that have high sensitivity and specificity, fast analysis, low cost and portability. The latter include the use of microarray chips, multiplex lateral flow, Surface Plasmon Resonance, Surface Enhanced Raman Scattering and biosensors using nanoparticles. In this perspective, thin film sensors have recently emerged as a good candidate technique to meet such requirements. This review summarizes the application and challenges of thin film sensor devices for detection of mycotoxins in food matrices.

scholarly journals PHOTODIODE BASED ON THE EPITAXIAL PHOSPHIDE GALLIUM WITH INCREASED SENSITIVITY AT A WAVELENGTH OF 254 nm

2020 ◽  
Vol 10 (1) ◽  
pp. 36-39
Author(s):  
Yurii Dobrovolsky ◽  
Volodymyr M. Lipka ◽  
Volodymyr V. Strebezhev ◽  
Yurii O. Sorokatyi ◽  
Mykola O. Sorokatyi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Barrier Layer ◽  
Gallium Phosphide ◽  
Dynamic Range ◽  
Spectral Characteristics ◽  
High Sensitivity ◽  
Ion Etching ◽  
Increased Sensitivity ◽  
20 Nm ◽  
The Magnetic Field

The paper shows the results of the development of a photodiode technology based on gallium phosphide structure n+-n-GaP-Au with high sensitivity. It provides the ion etching of the surface of the gallium phosphide before an application of a leading electrode of gold. The barrier layer of a 20 nm thick gold is applied to the substrate in the magnetic field of GaP. When forming the contact with the reverse side of the indium substrate at 600°C, there occurs the annealing of the gold barrier layer. At the maximum of the spectral characteristics obtained by the photodiode, it has a sensitivity of 0.13 A/W, and at a wavelength of 254 nm – about 0.06 A/W. The dynamic range of the photodiode is not less than 107.

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