A new, ultrathin film that is both transparent and highly conductive to electric current has been produced by a cheap and simple method devised by an international team of nanomaterials researchers from the University of Illinois at Chicago and Korea University.
The film is also bendable and stretchable, offering potential applications in roll-up touchscreen displays, wearable electronics, flexible solar cells and electronic skin. The results are reported in Advanced Functional Materials.
The new film is made of fused silver nanowires, and is produced by spraying the nanowire particles through a tiny jet nozzle at supersonic speed. The result is a film with nearly the electrical conductivity of silver-plate — and the transparency of glass, says senior author Alexander Yarin, UIC Distinguished Professor of Mechanical Engineering.
“The silver nanowire is a particle, but very long and thin,” Yarin said. The nanowires measure about 20 microns long, so four laid end-to-end would span the width of a human hair. But their diameter is a thousand times smaller — and significantly smaller than the wavelength of visible light, which minimizes light scattering.
The researchers suspended the nanowire particles in water and propelled them by air through a de Laval nozzle, which has the same geometry as a jet engine, but is only a few millimeters in diameter.
“The liquid needs to be atomized so it evaporates in flight,” Yarin said. When the nanowires strike the surface they are being applied to at supersonic speed, they fuse together, as their kinetic energy is converted to heat.
“The ideal speed is 400 meters per second,” Yarin said. “If the energy is too high, say 600 meters per second, it cuts the wires. If too low, as at 200 meters per second, there’s not enough heat to fuse the wires.”
The researchers applied the nanowires to flexible plastic films and to three-dimensional objects. “The surface shape doesn’t matter,” Yarin said.
The transparent flexible film can be bent repeatedly and stretched to seven times its original length and still work, said Sam Yoon, the corresponding author of the study and a professor of mechanical engineering at Korea University.
Earlier this year, Yarin and Yoon and their colleagues produced a transparent conducting film by electroplating a mat of tangled nanofiber with copper. Compared to that film, the self-fused silver nanowire film offers better scalability and production rate, Yoon said.
“It should be easier and cheaper to fabricate, as it’s a one-step versus a two-step process,” said Yarin. “You can do it roll-to-roll on an industrial line, continuously.”
The Latest on: Wearable electronics
via Google News
The Latest on: Wearable electronics
- COVID-19 Impact on Wearable Medical Devices Market Growth, Size Estimation, Future Trends, Share Analysis, Sales Statistics and Key Insights By 2023on May 12, 2020 at 6:06 am
Wearable Medical Devices Market Outlook The recent COVID-19 pandemic has impact on wearable medical devices market owing to rising influence of ...
- Healthcare Wearable Device Market Growth 2020 Industry Share, Manufacturing Size, Driving Factors with Manufacturers, Trends and Forecast to 2026on May 12, 2020 at 5:17 am
Global “Healthcare Wearable Device Market” research report is segmented for proper understanding. The report provides ...
- Global Smart Wearable Market Demand, Developments Trends and Outlook 2020-2025on May 12, 2020 at 1:20 am
The Global Smart Wearable Market was valued at 216.18 million units in 2019 and is expected to reach 614.31 million units by 2025, at a CAGR of 19.1% over the forecast period 2020 - 2025. Advancements ...
- Glasgow engineers develop wearable device powered by sweat | Pret A Manger launches first supermarket offering | Angling firm's shares riseon May 11, 2020 at 9:32 am
A new generation of wearable devices could be powered by human sweat instead of conventional batteries, scientists have said.
- Sweat could power future wearable devices, say researcherson May 11, 2020 at 7:24 am
A new generation of wearable devices could be powered by human sweat instead of conventional batteries, scientists have said. Engineers at the University of Glasgow have developed a new type of ...
- U.S. researchers testing wearable tech to aid in coronavirus symptom detectionon May 7, 2020 at 2:01 pm
A group of researchers in the U.S. has developed a wearable device they say could detect symptoms associated with the novel coronavirus. The new device does not look like other wearable electronics — ...
- Powercast and Liquid X Announce Printed Electronics Venture to Enable Durable, Washable e-Textiles that Seal in Wireless Charging Electronicson May 5, 2020 at 5:45 am
Powercast Corporation, the leader in radio-frequency (RF)-based long-range over-the-air wireless power technology, and Liquid X, an advanced manufacturer of functional metallic inks with ...
- Apple Wins Major Patent for Next-Gen Input Gloves, Thimbles, Glasses & other Wearable Attachments for VR+on May 5, 2020 at 4:37 am
The U.S. Patent and Trademark Office officially published a series of 66 newly granted patents for Apple Inc. today. In this particular report we cover Apple's patent that relates to next-gen wearable ...
- Global Wearable Patch Market (2020 to 2024) - Featuring Abbott, Delta Electronics and Gentag Among Otherson May 1, 2020 at 2:48 am
This robust vendor analysis is designed to help clients improve their market position. In line with this, this report provides a detailed analysis of several leading wearable patch market vendors that ...
via Bing News