scholarly journals Stretchable MXene/Thermoplastic Polyurethanes based Strain Sensor Fabricated Using a Combined Electrospinning and Electrostatic Spray Deposition Technique

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 252
Author(s):  
Feiyu Fang ◽  
Han Wang ◽  
Huaquan Wang ◽  
Xiaofei Gu ◽  
Jun Zeng ◽  
...  
Keyword(s):  
Spray Deposition ◽  
Strain Sensor ◽  
Strain Sensors ◽  
Strain Sensing ◽  
Electrostatic Spray Deposition ◽  
Thermoplastic Polyurethanes ◽  
Deposition Processes ◽  
Human Motions ◽  
Electrostatic Spray ◽  
Stretching Process

In this work, a novel flexible electrically resistive-type MXene/Thermoplastic polyurethanes(TPU) based strain sensors was developed by a composite process of electrospinning (ES) and electrostatic spray deposition (ESD). Compared with other deposition processes, the sensing layer prepared by ESD has better adhesion to the ES TPU nanofiber membrane and is not easy to crack during the stretching process, thereby greatly improving the working range of the strain sensor. Furthermore, we obtained the sandwich structure easily by ES on the surface of the sensing layer again. This will help make the stress distribution more uniform during the stretching process and further increase the strain sensing range. The ESD-ES strain sensors were attached on skin to monitor various human motions. The results demonstrate that our ESD-ES strain sensors have wide application prospects in smart wearable device.

scholarly journals Corrugated Photoactive Thin Films for Flexible Strain Sensor

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1970 ◽  
Author(s):  
Donghyeon Ryu ◽  
Alfred Mongare
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Electrical Properties ◽  
Tensile Strain ◽  
Strain Sensor ◽  
Strain Sensors ◽  
Optical And Electrical Properties ◽  
Strain Sensing ◽  
Dc Voltage ◽  
Flexible Strain Sensor

In this study, a flexible strain sensor is devised using corrugated bilayer thin films consisting of poly(3-hexylthiophene) (P3HT) and poly(3,4-ethylenedioxythiophene)-polystyrene(sulfonate) (PEDOT:PSS). In previous studies, the P3HT-based photoactive non-corrugated thin film was shown to generate direct current (DC) under broadband light, and the generated DC voltage varied with applied tensile strain. Yet, the mechanical resiliency and strain sensing range of the P3HT-based thin film strain sensor were limited due to brittle non-corrugated thin film constituents. To address this issue, it is aimed to design a mechanically resilient strain sensor using corrugated thin film constituents. Buckling is induced to form corrugation in the thin films by applying pre-strain to the substrate, where the thin films are deposited, and releasing the pre-strain afterwards. It is known that corrugated thin film constituents exhibit different optical and electronic properties from non-corrugated ones. Therefore, to design the flexible strain sensor, it was studied to understand how the applied pre-strain and thickness of the PEDOT:PSS conductive thin film affects the optical and electrical properties. In addition, strain effect was investigated on the optical and electrical properties of the corrugated thin film constituents. Finally, flexible strain sensors are fabricated by following the design guideline, which is suggested from the studies on the corrugated thin film constituents, and the DC voltage strain sensing capability of the flexible strain sensors was validated. As a result, the flexible strain sensor exhibited a tensile strain sensing range up to 5% at a frequency up to 15 Hz with a maximum gauge factor ~7.

Correlating Electrospray Characteristics with Surface Morphology of Calcium Phosphate Coatings Deposited Using Electrostatic Spray Deposition (ESD)

2006 ◽  
Vol 309-311 ◽  
pp. 611-614
Author(s):  
Sander C.G. Leeuwenburgh ◽  
M.C. Heine ◽  
Joop G.C. Wolke ◽  
Sotiris E. Pratsinis ◽  
J. Schoonman ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Spray Deposition ◽  
Morphological Characteristics ◽  
Precursor Solution ◽  
Processing Parameters ◽  
Nozzle Geometry ◽  
Electrostatic Spray Deposition ◽  
Droplet Sizes ◽  
Calcium Phosphate Coatings ◽  
Electrostatic Spray

In situ measurements of electrospray droplet sizes and velocities were performed by Phase Doppler Anemometry during Electrostatic Spray Deposition (ESD) of calcium phosphate (CaP) coatings. Numerous processing parameters were varied (nozzle-to-substrate distance, deposition temperature, nozzle geometry, and composition of the precursor solution), whereafter the morphological characteristics of these ESD-derived CaP coatings were correlated with measured droplet characteristics. Equal droplet sizes and velocities were measured for nozzle-to-substrate distances up to 40 mm and deposition temperatures up to 400 °C, indicating that electrospray droplets did not shrink at all during droplet flight using an involatile solvent butyl carbitol with a high boiling point (Tb = 231 °C). Nevertheless, coatings with considerably different surface morphologies were obtained under these conditions, varying from microporous structures with coalesced pore walls to morphologies revealing isolated rings on top of dense or grainy underlayers. The chemical composition of the precursor solutions and the mixing characteristics of the calcium and phosphate precursor components strongly influenced the initial droplet sizes, precipitation kinetics of the CaP solute, and subsequent coating morphology. Unique, reticular coating morphologies were deposited at a deposition rate of 3.2 µm/hour, which have a graded structure consisting of a dense underlayer, a submicron-porous intermediate layer, and a roughened toplayer revealing droplet-derived features such as isolated rings or coalesced, hollow surface pits.

Preparation of LiNiO 2 and LiM y   Ni 1- y   O 2 (M=Co,Al) films by electrostatic spray deposition

1999 ◽  
Vol 3 (3) ◽  
pp. 148-153 ◽  
Author(s):  
Kohta Yamada ◽  
Nobuaki Sato ◽  
Takeo Fujino ◽  
Choong G. Lee ◽  
Isama Uchida ◽  
...  
Keyword(s):  
Spray Deposition ◽  
Electrostatic Spray Deposition ◽  
Electrostatic Spray
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