Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Nanoquakes probe new 2-dimensional material

27.10.2015

Collaborative research between UC Riverside and the University of Augsburg, Germany, opens up new ways of understanding monolayer films for (opto-)electronic applications

In a step towards a post-graphene era of new materials for electronic applications, an international team of researchers, including scientists at the University of California, Riverside, has found a new and exciting way to elucidate the properties of novel two-dimensional semiconductors. These materials have unique properties that promise better integration of optical communication with traditional silicon-based devices.


UC Riverside student Edwin Preciado (left) is seen here working at the University of Augsburg, Germany. He is seen in the second photo with University of Augsburg student Sebastian Hammer.

Credit: Hubert Krenner (Univ. of Augsburg) and Ludwig Bartels (UC Riverside).

The researchers fabricated a single-atomic-layer-thin film of molybdenum disulfide (MoS2) on a substrate of lithium niobate (LiNbO3). LiNbO3 is used in many electronic devices dealing with high-frequency signals such as cell phones or radar installations. Applying electrical pulses to LiNbO3, the researchers created very high frequency sound waves - "surface acoustic waves" - that run along the surface of LiNbO3, akin to earthquake tremors on land. Cell phones, for example, use resonances of these surface waves to filter electric signals in a manner similar to a wine glass resonating when a voice hits it at exactly the right pitch.

Specifically, the research team used the surface waves of LiNbO3 to listen to how the illumination of LiNbO3 by laser light changes the electric properties of MoS2.

"The tone at which a wine glass resonates changes as you fill it up. If you ping it with a spoon, you can hear that tone. With practice you can guess from the tone how full the wine glass is without looking at the glass," explained Ludwig Bartels, a professor of chemistry who led the team at UC Riverside. "In a similar way, we can 'hear' the LiNbO3 sound waves and infer how much current the laser light allowed to flow in the MoS2. We also fabricated transistor structures onto the MoS2 films and proved that indeed our analysis is correct."

Study results appeared online last week in Nature Communications.

"The well-established nature of the substrates and the processes to create surface acoustic waves makes the novel technique facile and ready to be applied," Bartels said. "In particular, even remote, wireless sensing applications appear to be within reach."

The research project resulted from collaboration between students and researchers at UC Riverside and the University of Augsburg, Germany.

For this project, Bartels's lab greatly benefited from the complementary expertise between the two universities, allowing the researchers to explore new perspectives. Material fabrication proceeded at UCR in Bartels's lab, followed by device integration in Bavaria.

"It was really exciting to see how our students obtained these fascinating results by combining the 2D materials from California and our expertise in surface acoustic waves," said Hubert Krenner, a member of the Cluster of Excellence Nanosystems Initiative Munich (NIM), Germany, who led the project at the University of Augsburg together with Achim Wixforth. UCR graduate student Edwin Preciado and University of Augsburg recent graduate Florian J. R. Schülein spearheaded the research project in the research laboratories of Bartels and Krenner, respectively.

"International collaboration and my being able to do research work in Germany was crucial for the success of this project," Preciado said. "I learned much by staying for a few months in Augsburg. It provided me with experience and skills that otherwise I would not have been able to acquire easily."

Likewise, Sebastian Hammer, a graduate student at the University of Augsburg, worked in Bartels's lab this summer fabricating a new batch of devices in an extension of the current project.

###

The research was supported by C-SPIN, a STARnet center of the Semiconductor Research Corporation, the U.S. National Science Foundation, the Deutsche Forschungsgemeinschaft and NIM. The collaborative interaction was facilitated by generous support from the Bavaria-California Technology Center.

Bartels, Krenner, Preciado, Schülein, Hammer and Wixforth were joined in the research by Ariana E. Nguyen, David Barroso, Miguel Isarraraz, Gretel von Son Palacio, I-Hsi Lu and Velveth Klee at UCR; Wladislaw Michailow and Benjamin Moller at the University of Augsburg; and John Mann a recent UCR graduate and now a faculty member at Pepperdine University, Calif.

The University of California, Riverside (http://www.ucr.edu) is a doctoral research university, a living laboratory for groundbreaking exploration of issues critical to Inland Southern California, the state and communities around the world. Reflecting California's diverse culture, UCR's enrollment has exceeded 21,000 students. The campus opened a medical school in 2013 and has reached the heart of the Coachella Valley by way of the UCR Palm Desert Center. The campus has an annual statewide economic impact of more than $1 billion. A broadcast studio with fiber cable to the AT&T Hollywood hub is available for live or taped interviews. UCR also has ISDN for radio interviews. To learn more, call (951) UCR-NEWS.

Media Contact

Iqbal Pittalwala
iqbal@ucr.edu
951-827-6050

 @UCRiverside

http://www.ucr.edu 

Iqbal Pittalwala | EurekAlert!

More articles from Materials Sciences:

nachricht Getting closer to porous, light-responsive materials
26.07.2017 | Kyoto University

nachricht Multitasking monolayers
25.07.2017 | Vanderbilt University

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Carbon Nanotubes Turn Electrical Current into Light-emitting Quasi-particles

Strong light-matter coupling in these semiconducting tubes may hold the key to electrically pumped lasers

Light-matter quasi-particles can be generated electrically in semiconducting carbon nanotubes. Material scientists and physicists from Heidelberg University...

Im Focus: Flexible proximity sensor creates smart surfaces

Fraunhofer IPA has developed a proximity sensor made from silicone and carbon nanotubes (CNT) which detects objects and determines their position. The materials and printing process used mean that the sensor is extremely flexible, economical and can be used for large surfaces. Industry and research partners can use and further develop this innovation straight away.

At first glance, the proximity sensor appears to be nothing special: a thin, elastic layer of silicone onto which black square surfaces are printed, but these...

Im Focus: 3-D scanning with water

3-D shape acquisition using water displacement as the shape sensor for the reconstruction of complex objects

A global team of computer scientists and engineers have developed an innovative technique that more completely reconstructs challenging 3D objects. An ancient...

Im Focus: Manipulating Electron Spins Without Loss of Information

Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.

For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...

Im Focus: The proton precisely weighted

What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.

To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

Closing the Sustainability Circle: Protection of Food with Biobased Materials

21.07.2017 | Event News

»We are bringing Additive Manufacturing to SMEs«

19.07.2017 | Event News

 
Latest News

CCNY physicists master unexplored electron property

26.07.2017 | Physics and Astronomy

Molecular microscopy illuminates molecular motor motion

26.07.2017 | Life Sciences

Large-Mouthed Fish Was Top Predator After Mass Extinction

26.07.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>