Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International



Home > Press > Inorganic borophene liquid crystals: A superior new material for optoelectronic devices

The inset shows a chemical structure of the prepared BoLs. White arrows indicate the borophene oxide atomic layers and purple spheres represent potassium cations.

CREDIT
Tetsuya Kambe from Tokyo Institute of Technology
The inset shows a chemical structure of the prepared BoLs. White arrows indicate the borophene oxide atomic layers and purple spheres represent potassium cations. CREDIT Tetsuya Kambe from Tokyo Institute of Technology

Abstract:
Liquid crystals derived from borophene have risen in popularity, owing to their immense applicability in optoelectronic and photonic devices. However, their development requires a very narrow temperature range, which hinders their large-scale application. Now, Tokyo Tech researchers investigated a liquid-state borophene oxide, discovering that it exhibited high thermal stability and optical switching behavior even at low voltages. These findings highlight the strong potential of borophene oxide-derived liquid crystals for use in widespread applications.

Inorganic borophene liquid crystals: A superior new material for optoelectronic devices

Tokyo, Japan | Posted on February 25th, 2022

Two-dimensional (2D) atomic layered materials, such as the carbon-based graphene and the boron-based borophene, are highly sought after for their applications in a variety of optoelectronic devices, owing to their desirable electronic properties. The monolayer structure of borophene with a network of boron bonds endows it with high flexibility, which can be beneficial for the generation of a liquid state at low temperatures. Thus, it is not surprising that liquid crystals derived from 2D networked structures are in high demand. However, the poor stability of borophene, in particular, makes it difficult for it to undergo a phase transition to the liquid state.



In contrast, borophene oxide—a derivative of borophene—can improve the stability of the internal boron network, in turn stabilizing the entire structure. This property of borophene oxide is different from that of other 2D materials, which are unable to yield liquid crystals without the use of solvents.



To compensate for the lack of suitable liquid crystals, a team of researchers from Japan, including Assistant Professor Tetsuya Kambe and Professor Kimihisa Yamamoto from Tokyo Institute of Technology, investigated the properties of a borophene oxide analogue as a fully inorganic liquid with a layered structure. Their study was recently published in Nature Communications.



Initially, the team used previously tested methods to generate borophene oxide layers (BoL) as crystals (BoL-C). They then converted BoL-C to liquid crystals (BoL-LC) by heating them to temperatures of 105-200°C. They observed that the resultant dehydration weakened the interactions between the interlayers of BoL-C, which is desirable for its flexibility.



The team then analyzed the structural properties of BoL-LC using polarized optical microscopy, discovering that BoL-LC sheets are found stacked parallel to the surface of the liquid drop with a slightly curved form. This spherulite orientation of borophene sheets was confirmed using scanning electron microscopy.



An analysis of the phase transition features revealed that phase transition (P-ii/P-i) occurred at around 100°C for BoL-LC. In fact, both transition phases exhibited high thermal stability at extreme temperatures. The team also observed a highly ordered orientation of the P-ii phase



To test its optical switching behavior, the team created a dynamic scattering device using BoL-LC, and found that unlike other organic liquid crystals, the BoL-based device responded well to voltages as low as 1V. These findings highlight the feasibility of inorganic liquid devices in harsh environments.



“Although a liquid crystal device using graphene oxide has been reported previously, it was a lyotropic liquid crystal, with a strong dependence on the solution concentration. Therefore, the previously reported material is different from the liquid borophene created in this study, without the use of any solvents,” says Dr. Kambe, while discussing the advantages of BoL-LC over other 2D liquid crystals.



What’s more, they found that even upon exposure to direct fire, BoL-LC was noncombustible! This confirms that BoL-LC in a liquid state with an ordered layer structure can exist over a wide range of temperatures – a property which has not been observed so far for other organic materials.

When asked about the implications of these findings, Dr. Kambe and Dr. Yamamoto stated, “BoL-LC exhibits strong potential for use in widespread applications, that are unavailable to conventional organic liquid crystals or inorganic materials.”

Indeed, borophene liquid crystals are stacked with several advantages and may expedite important developments in the optoelectronics and photonics industry in the future!

####

About Tokyo Institute of Technology
Tokyo Tech stands at the forefront of research and higher education as the leading university for science and technology in Japan. Tokyo Tech researchers excel in fields ranging from materials science to biology, computer science, and physics. Founded in 1881, Tokyo Tech hosts over 10,000 undergraduate and graduate students per year, who develop into scientific leaders and some of the most sought-after engineers in industry. Embodying the Japanese philosophy of “monotsukuri,” meaning “technical ingenuity and innovation,” the Tokyo Tech community strives to contribute to society through high-impact research.

For more information, please click here

Contacts:
Emiko Kawaguchi
Tokyo Institute of Technology

Office: 3-57342975

Copyright © Tokyo Institute of Technology

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

ARTICLE TITLE

Related News Press

News and information

New technology helps reveal inner workings of human genome June 24th, 2022

Advances in lithium niobate photonics: High performance integrated LN-based photonic devices have developed rapidly in recent years, and many different structures have been demonstrated for various application scenarios—are we about to enter a new era of LN photonics? June 24th, 2022

Advances in lithium niobate photonics: High performance integrated LN-based photonic devices have developed rapidly in recent years, and many different structures have been demonstrated for various application scenarios—are we about to enter a new era of LN photonics? June 24th, 2022

Boron nitride nanotube fibers get real: Rice lab creates first heat-tolerant, stable fibers from wet-spinning process June 24th, 2022

Display technology/LEDs/SS Lighting/OLEDs

Newly developed technique to improve quantum dots color conversion performance: Researchers created perovskite quantum dot microarrays to achieve better results in full-color light-emitting devices and expand potential applications June 10th, 2022

A solution to perovskite solar cell scalability problems April 22nd, 2022

Graphene-hBN breakthrough to spur new LEDs, quantum computing: Study uncovers first method for producing high-quality, wafer-scale, single-layer hexagonal boron nitride April 15th, 2022

Graphene crystals grow better under copper cover April 1st, 2022

Possible Futures

New technology helps reveal inner workings of human genome June 24th, 2022

Advances in lithium niobate photonics: High performance integrated LN-based photonic devices have developed rapidly in recent years, and many different structures have been demonstrated for various application scenarios—are we about to enter a new era of LN photonics? June 24th, 2022

Advances in lithium niobate photonics: High performance integrated LN-based photonic devices have developed rapidly in recent years, and many different structures have been demonstrated for various application scenarios—are we about to enter a new era of LN photonics? June 24th, 2022

Boron nitride nanotube fibers get real: Rice lab creates first heat-tolerant, stable fibers from wet-spinning process June 24th, 2022

Optical computing/Photonic computing

Advances in lithium niobate photonics: High performance integrated LN-based photonic devices have developed rapidly in recent years, and many different structures have been demonstrated for various application scenarios—are we about to enter a new era of LN photonics? June 24th, 2022

Advances in lithium niobate photonics: High performance integrated LN-based photonic devices have developed rapidly in recent years, and many different structures have been demonstrated for various application scenarios—are we about to enter a new era of LN photonics? June 24th, 2022

Photonic integrated erbium doped amplifiers reach commercial performance: Boosting light power revolutionizes communications and autopilots June 17th, 2022

Electron-phonon coupling assisted universal red luminescence of o-phenylenediamine-based CDs June 10th, 2022

Discoveries

New technology helps reveal inner workings of human genome June 24th, 2022

Advances in lithium niobate photonics: High performance integrated LN-based photonic devices have developed rapidly in recent years, and many different structures have been demonstrated for various application scenarios—are we about to enter a new era of LN photonics? June 24th, 2022

Advances in lithium niobate photonics: High performance integrated LN-based photonic devices have developed rapidly in recent years, and many different structures have been demonstrated for various application scenarios—are we about to enter a new era of LN photonics? June 24th, 2022

Boron nitride nanotube fibers get real: Rice lab creates first heat-tolerant, stable fibers from wet-spinning process June 24th, 2022

Announcements

New technology helps reveal inner workings of human genome June 24th, 2022

Advances in lithium niobate photonics: High performance integrated LN-based photonic devices have developed rapidly in recent years, and many different structures have been demonstrated for various application scenarios—are we about to enter a new era of LN photonics? June 24th, 2022

Advances in lithium niobate photonics: High performance integrated LN-based photonic devices have developed rapidly in recent years, and many different structures have been demonstrated for various application scenarios—are we about to enter a new era of LN photonics? June 24th, 2022

Boron nitride nanotube fibers get real: Rice lab creates first heat-tolerant, stable fibers from wet-spinning process June 24th, 2022

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

Quantum network nodes with warm atoms June 24th, 2022

New technology helps reveal inner workings of human genome June 24th, 2022

Advances in lithium niobate photonics: High performance integrated LN-based photonic devices have developed rapidly in recent years, and many different structures have been demonstrated for various application scenarios—are we about to enter a new era of LN photonics? June 24th, 2022

Advances in lithium niobate photonics: High performance integrated LN-based photonic devices have developed rapidly in recent years, and many different structures have been demonstrated for various application scenarios—are we about to enter a new era of LN photonics? June 24th, 2022

Photonics/Optics/Lasers

Advances in lithium niobate photonics: High performance integrated LN-based photonic devices have developed rapidly in recent years, and many different structures have been demonstrated for various application scenarios—are we about to enter a new era of LN photonics? June 24th, 2022

Advances in lithium niobate photonics: High performance integrated LN-based photonic devices have developed rapidly in recent years, and many different structures have been demonstrated for various application scenarios—are we about to enter a new era of LN photonics? June 24th, 2022

Photonic integrated erbium doped amplifiers reach commercial performance: Boosting light power revolutionizes communications and autopilots June 17th, 2022

Marching to the Cadence of Electronics: Innovation A new paper in Nature validates technology developed by John Bowers and collaborators June 10th, 2022

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project