scholarly journals Investigation of Carbon-Based Composites for Elastic Heaters and Effects of Hot Pressing in Thermal Transfer Process on Thermal and Electrical Properties

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7606
Author(s):  
Tomasz Raczyński ◽  
Daniel Janczak ◽  
Jerzy Szałapak ◽  
Piotr Walter ◽  
Małgorzata Jakubowska
Keyword(s):  
Flexible Electronics ◽  
Hot Pressing ◽  
Screen Printing ◽  
Printed Electronics ◽  
Wearable Electronics ◽  
Thermal Transfer ◽  
Wide Range ◽  
Thermal And Electrical Properties ◽  
Carbon Based ◽  
Screen Printed

Wearable electronics are new structures with a wide range of possible applications. This study aims to analyze the effects of hot pressing in thermal transfer of different carbon-based composites as a new application method of screen-printed electronics on textiles. Flexible heaters were screen-printed on polyethylene terephthalate PET foil with composites based on graphene, carbon black, and graphite with different wt.%, measured and then hot pressed to measure and analyze differences. Research showed that the hot pressing process in thermal transfer resulted in decreased electrical resistance, increased power, and higher maximal temperatures. Best results were achieved with composites based on 12 wt.% graphene with sheet resistance lowered by about 40% and increased power by about 110%. This study shows promise for thermal transfer and screen-printing combination as an alternative for creating flexible electronics on textiles.

scholarly journals Stretchable and Washable Electroluminescent Display Screen-Printed on Textile

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1276 ◽  
Author(s):  
Daniel Janczak ◽  
Marcin Zych ◽  
Tomasz Raczyński ◽  
Łucja Dybowska-Sarapuk ◽  
Andrzej Pepłowski ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Mechanical Strength ◽  
Rheological Properties ◽  
Polymer Composites ◽  
Screen Printing ◽  
Printed Electronics ◽  
Wearable Electronics ◽  
Printing Technology ◽  
Wide Range ◽  
Screen Printing Technology

Stretchable polymer composites are a new group of materials with a wide range of application possibilities in wearable electronics. The purpose of this study was to fabricate stretchable electroluminescent (EL) structures using developed polymer compositions, based on multiple different nanomaterials: luminophore nanopowders, dielectric, carbon nanotubes, and conductive platelets. The multi-layered EL structures have been printed directly on textiles using screen printing technology. During research, the appropriate rheological properties of the developed composite pastes, and their suitability for printed electronics, have been confirmed. The structure that has been created from the developed materials has been tested in terms of its mechanical strength and resistance to washing or ironing.

Investigating flexible textile-based coils for wireless charging wearable electronics

2019 ◽  
Vol 50 (3) ◽  
pp. 333-345 ◽  
Author(s):  
Danmei Sun ◽  
Meixuan Chen ◽  
Symon Podilchak ◽  
Apostolos Georgiadis ◽  
Qassim S Abdullahi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electrical Conductivity ◽  
Electromagnetic Field ◽  
Electric Field ◽  
Dimensional Stability ◽  
Screen Printing ◽  
Wearable Electronics ◽  
Wireless Charging ◽  
The Magnetic Field ◽  
Screen Printed

Smart and interactive textiles have been attracted great attention in recent years. This research explored three different techniques and processes in developing textile-based conductive coils that are able to embed in a garment layer. Coils made through embroidery and screen printing have good dimensional stability, although the resistance of screen printed coil is too high due to the low conductivity of the print ink. Laser cut coil provided the best electrical conductivity; however, the disadvantage of this method is that it is very difficult to keep the completed coil to the predetermined shape and dimension. The tested results show that an electromagnetic field has been generated between the textile-based conductive coil and an external coil that is directly powered by electricity. The magnetic field and electric field worked simultaneously to complete the wireless charging process.

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

Highly responsive screen-printed asymmetric pressure sensor based on laser-induced graphene

2021 ◽  
Author(s):  
Jiang Zhao ◽  
Jiahao Gui ◽  
Jinsong Luo ◽  
Jing Gao ◽  
Caidong Zheng ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Screen Printing ◽  
Large Scale ◽  
Low Cost ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Wearable Electronics ◽  
Integrated Sensor ◽  
Patterned Electrodes ◽  
Screen Printed

Abstract Graphene-based pressure sensors have received extensive attention in wearable devices. However, reliable, low-cost, and large-scale preparation of structurally stable graphene electrodes for flexible pressure sensors is still a challenge. Herein, for the first time, laser-induced graphene (LIG) powder are prepared into screen printing ink, and shape-controllable LIG patterned electrodes can be obtained on various substrates using a facile screen printing process, and a novel asymmetric pressure sensor composed of the resulting screen-printed LIG electrodes has been developed. Benefit from the 3D porous structure of LIG, the as-prepared flexible LIG screen-printed asymmetric pressure sensor has super sensing properties with a high sensitivity of 1.86 kPa−1, low detection limit of about 3.4 Pa, short response time, and long cycle durability. Such excellent sensing performances give our flexible asymmetric LIG screen-printed pressure sensor the ability to realize real-time detection of tiny body physiological movements (such as wrist pulse and pronunciation action). Besides, the integrated sensor array has a multi-touch function. This work could stimulate an appropriate approach to designing shape-controllable LIG screen-printed patterned electrodes on various flexible substrates to adapt the specific needs of fulfilling compatibility and modular integration for potential application prospects in wearable electronics.

scholarly journals An Electret/Hydrogel-Based Tactile Sensor Boosted by Micro-Patterned and Electrostatic Promoting Methods with Flexibility and Wide-Temperature Tolerance

Micromachines ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1462
Author(s):  
Zhensheng Chen ◽  
Jiahao Yu ◽  
Haozhe Zeng ◽  
Zhao Chen ◽  
Kai Tao ◽  
...  
Keyword(s):  
Flexible Electronics ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Tactile Sensor ◽  
Treatment Method ◽  
Temperature Tolerance ◽  
Open Circuit ◽  
Wearable Electronics ◽  
Peak Voltage ◽  
Wide Range

With the rising demand for wearable, multifunctional, and flexible electronics, plenty of efforts aiming at wearable devices have been devoted to designing sensors with greater efficiency, wide environment tolerance, and good sustainability. Herein, a thin film of double-network ionic hydrogel with a solution replacement treatment method is fabricated, which not only possesses excellent stretchability (>1100%) and good transparency (>80%), but also maintains a wide application temperature range (−10~40 °C). Moreover, the hydrogel membrane further acts as both the flexible electrode and a triboelectric layer, with a larger friction area achieved through a micro-structure pattern method. Combining this with a corona-charged fluorinated ethylene propylene (FEP) film, an electret/hydrogel-based tactile sensor (EHTS) is designed and fabricated. The output performance of the EHTS is effectively boosted by 156.3% through the hybrid of triboelectric and electrostatic effects, which achieves the open-circuit peak voltage of 12.5 V, short-circuit current of 0.5 μA, and considerable power of 4.3 μW respectively, with a mentionable size of 10 mm × 10 mm × 0.9 mm. The EHTS also demonstrates a stable output characteristic within a wide range of temperature tolerance from −10 to approximately 40 °C and can be further integrated into a mask for human breath monitoring, which could provide for a reliable healthcare service during the COVID-19 pandemic. In general, the EHTS shows excellent potential in the fields of healthcare devices and wearable electronics.

scholarly journals Novel nano-materials and nano-fabrication techniques for flexible electronic systems

2018 ◽  
Author(s):  
Kyowon Kang ◽  
Young Uk Cho ◽  
Ki Jun Yu
Keyword(s):  
Flexible Electronics ◽  
Nanoimprint Lithography ◽  
Soft Lithography ◽  
Electronic Devices ◽  
Chemical Vapor ◽  
Wearable Electronics ◽  
Nano Materials ◽  
Flexible Display ◽  
Wide Range ◽  
Nanoscale Fabrication

Recent progress in the fabricating flexible electronics has been developed significantly due to the increased interest of the flexible electronics which can be applied to enormous fields not only to conventional electronic devices but to bio/eco electronic devices. Flexible electronics can be applied to wide range of fields such as flexible display, flexible power storage, flexible solar cells, wearable electronics and healthcare monitoring devices. Recently, flexible electronics are being attached on the skin and even implanted into human body to monitor the bio-signals and for treatment purpose. To improve the electrical characteristic and the mechanical properties of flexible electronics, nanoscale fabrications using novel nano-materials are required. Advanced in nanoscale fabrication methods allow construction of the active materials that can combine with the ultra-thin soft substrate to form flexible electronics with high performances and reliability. In this review, wide range of nanoscale fabrication methods for flexible electronics classified in either top-down or bottom-up approaches such as conventional photolithography, soft lithography, nanoimprint lithography, growth, assembly and chemical vapor deposition(CVD) will be reported with specific fabrication processes and results. Here, our aim is to introduce various fabrication methods that can be used to fabricate the flexible electronics.

scholarly journals A Brief Review on Fabrication of Screen-Printed Carbon Electrode: Materials and Techniques

2021 ◽  
Vol 8 (3) ◽  
pp. 210-218
Author(s):  
Wulan Tri Wahyuni ◽  
Budi Riza Putra ◽  
Achmad Fauzi ◽  
Desi Ramadhanti ◽  
Eti Rohaeti ◽  
...  
Keyword(s):  
Screen Printing ◽  
Electrode Materials ◽  
Electrochemical Measurements ◽  
Carbon Electrode ◽  
Conductive Materials ◽  
Flat Substrate ◽  
Screen Printed Carbon Electrode ◽  
Printing Technique ◽  
Carbon Based ◽  
Screen Printed

Screen-printed carbon electrode (SPCE) is one of the most interesting designs to combine a working (from carbon based material), reference, and counter electrode in a single-printed substrate. SPCE has been used in many electrochemical measurements due to its advantages for analysis in microscale. This paper summarises the main information about SPCE fabrication from the material and fabrication technique aspect on the flat substrate based on the work that has been published in the last 30 years. The success of SPCE fabrication is highly dependent on the composition of conductive ink which consists of conductive materials, binder, and solvents; substrate; and fabrication techniques. Among the carbon-based materials, the most widely used for SPCE fabrications are graphite, graphene, and carbon nanotubes. The frequent binder used are polymer-based materials such as polystyrene, polyaniline, poly 3,4-ethylenedioxythiophene:polystyrene sulfonate (PEDOT:PSS), and polyvinyl chloride. The solvents used for SPCE fabrication are varied including water and various organic solvents. The main characteristics of the SPCE substrate should be inert in order to avoid any interferences during electrochemical measurements. The screen printing and inkjet printing technique are preferred for SPCE fabrication due to easy fabrication and the possibility for mass production of SPCE.

scholarly journals Advanced Manufacture by Screen Printing

2020 ◽  
Author(s):  
◽  
Sarah-Jane Potts
Keyword(s):  
Screen Printing ◽  
Computational Models ◽  
Printed Electronics ◽  
Low Cost ◽  
Solid Loading ◽  
Wide Range ◽  
Parametric Studies ◽  
Ink Transfer ◽  
First Time ◽  
Carbon Inks

Screen-printing is the most widely used process in printed electronics, due to its ability to transfer materials with a wide range of functional properties at high thickness and solid loading. However, the science of screen printing is still rooted in the graphics era, with limited understanding of the fundamental science behind the ink transfer process. A multifaceted approach encompassing all aspects of the production of printed electronics from ink formulation, through screen-printing and post processing was therefore undertaken. With a focus on carbon inks due to their electrical conductivity, low cost, inertness and ability to be modified or functionalised. Parametric studies found that with blade squeegees, lower angles and softer blades led to increases in ink deposition, irrespective of ink rheology. However, the effects of print speed and snap distance were related to the rheology of the inks. Existing computational models were inaccurate and based on two contrasting theories. Extensional CaBER testing provided qualitative indications of the effect of separation speed and distance on deposition. However, this could only assess the effect of vertical, 2-dimensional forces and could not evaluate the influence of shear forces due to separation angle or the effects of the screen mesh. For this purpose, a screen-printing visualisation rig was specifically constructed, allowing the ink transfer mechanism to be captured for the first time. This identified similarities with one of the two theories, although existing models had oversimplified the process and did not account for variations in lengths of the separation regions or the contact angle between the mesh and substrate. It was also found that changes in the ink rheology and parameter settings changes the lengths of these regions, as well as the shape and presence of filaments formed during separation. The parameters of print speed, snap distance, solid loading and ink rheology were assessed and found to affect the mesh/substrate contact time and filamentation behaviour. This had a quantifiable effect on ink deposition, in terms of the amount of ink transfer, roughness and therefore conductivity. Finally, photonic annealing and subsequent compression rolling were found to enhance the conductivity of carbon inks by removing binder between particles and consolidating the ink film, leading to 8 times reduction in resistivity for a graphite-based ink and halving in resistivity for an ink containing a combination of carbon black and graphite, where there was less potential for improvement due to the conductive bridges between the graphite flakes.

scholarly journals Integration of a 2D Touch Sensor with an Electroluminescent Display by Using a Screen-Printing Technology on Textile Substrate

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3313 ◽  
Author(s):  
Josue Ferri ◽  
Clara Perez Fuster ◽  
Raúl Llinares Llopis ◽  
Jorge Moreno ◽  
Eduardo Garcia‑Breijo
Keyword(s):  
Textile Industry ◽  
Screen Printing ◽  
Wearable Electronics ◽  
Printing Technology ◽  
Touch Sensor ◽  
Screen Printing Technique ◽  
Layer Structures ◽  
Wide Range ◽  
Fabric Materials ◽  
Screen Printing Technology

Many types of solutions have been studied and developed in order to give the user feedback when using touchpads, buttons, or keyboards in textile industry. Their application on textiles could allow a wide range of applications in the field of medicine, sports or the automotive industry. In this work, we introduce a novel solution that combines a 2D touchpad with an electroluminescent display (ELD). This approach physically has two circuits over a flexible textile substrate using the screen-printing technique for wearable electronics applications. Screen-printing technology is widely used in the textile industry and does not require heavy investments. For the proposed solution, different layer structures are presented, considering several fabric materials and inks, to obtain the best results.

scholarly journals One-step photonic curing of screen-printed conductive Ni flake electrodes for use in flexible electronics

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bilge Nazli Altay ◽  
Vikram S. Turkani ◽  
Alexandra Pekarovicova ◽  
Paul D. Fleming ◽  
Massood Z. Atashbar ◽  
...  
Keyword(s):  
Flexible Electronics ◽  
Printed Electronics ◽  
Pulse Length ◽  
Single Step ◽  
Electrical Performance ◽  
Great Promise ◽  
Photonic Curing ◽  
One Step ◽  
Ink Transfer ◽  
Screen Printed

AbstractPhotonic curing has shown great promise in maintaining the integrity of flexible thin polymer substrates without structural degradation due to shrinkage, charring or decomposition during the sintering of printed functional ink films in milliseconds at high temperatures. In this paper, single-step photonic curing of screen-printed nickel (Ni) electrodes is reported for sensor, interconnector and printed electronics applications. Solid bleached sulphate paperboard (SBS) and polyethylene terephthalate polymer (PET) substrates are employed to investigate the electrical performance, ink transfer and ink spreading that directly affect the fabrication of homogeneous ink films. Ni flake ink is selected, particularly since its effects on sintering and rheology have not yet been examined. The viscosity of Ni flake ink yields shear-thinning behavior that is distinct from that of screen printing. The porous SBS substrate is allowed approximately 20% less ink usage. With one-step photonic curing, the electrodes on SBS and PET exhibited electrical performances of a minimum of 4 Ω/sq and 16 Ω/sq, respectively, at a pulse length of 1.6 ms, which is comparable to conventional thermal heating at 130 °C for 5 min. The results emphasize the suitability of Ni flake ink to fabricate electronic devices on flexible substrates by photonic curing.

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