Rice University shows toughened material is easier to handle, useful for electronics
Nanoscale "rivets" give graphene qualities that may speed the wonder material's adoption in products like flexible, transparent electronics, according to researchers at Rice University.
The Rice lab of chemist James Tour reported the creation of "rivet graphene," two-dimensional carbon that incorporates carbon nanotubes for strength and carbon spheres that encase iron nanoparticles, which enhance both the material's portability and its electronic properties.
The material is the subject of a paper in the American Chemical Society journal ACS Nano.
Until now, researchers have had to transfer graphene grown via chemical vapor deposition with a polymer layer to keep it from wrinkling or ripping. But the polymer tended to leave contaminants behind and degrade graphene's abilities to carry a current.
"Rivet graphene proved tough enough to eliminate the intermediate polymer step," Tour said. "Also, the rivets make interfacing with electrodes far better compared with normal graphene's interface, since the junctions are more electrically efficient.
"Finally, the nanotubes give the graphene an overall higher conductivity. So if you want to use graphene in electronic devices, this is an all-around superior material," he said.
Tests proved rivet graphene retained the strength of the Tour lab's rebar graphene (which incorporates nanotube reinforcement) as well as rebar's ability to float on water. But the rivets also enhanced the material's ability to transfer current between electrodes and the graphene, even when bent, the researchers reported.
The rivets are layers of carbon wrapped around a 30-nanometer iron core, dubbed "nano-onions" by the lab. The structures are grown in place in the CVD furnace after the dispersal of nanotubes and deposition of graphene. A final step welds all the elements together, Tour said.
Rivet graphene is transparent enough for flexible and transparent electronics, he said, and the simplified process should be scalable.
Xinlu Li, a former visiting researcher at Rice and a professor at Chongqing University, China, is lead author of the paper. Co-authors are graduate student Junwei Sha of Rice, Tianjin University, China, and the Collaborative Innovation Center of Chemical Science and Engineering in Tianjin; graduate student Yilun Li, postdoctoral researcher Yongsung Ji and former postdoctoral researcher Seoung-Ki Lee of Rice; and Yujie Zhao of Chongqing. Tour is the T.T. and W.F. Chao Professor of Chemistry as well as a professor of computer science and of materials science and nanoengineering.
The research was funded by the Air Force Office of Scientific Research and its Multidisciplinary University Research Initiative, the Natural Science Foundation Project of China's Chongqing Science and Technology Commission and the China Scholarship Council.
Read the abstract at http://pubs.
This news release can be found online at http://news.
Follow Rice News and Media Relations via Twitter @RiceUNews
Tour Group: http://www.
Wiess School of Natural Sciences: http://natsci.
Located on a 300-acre forested campus in Houston, Rice University is consistently ranked among the nation's top 20 universities by U.S. News & World Report. Rice has highly respected schools of Architecture, Business, Continuing Studies, Engineering, Humanities, Music, Natural Sciences and Social Sciences and is home to the Baker Institute for Public Policy. With 3,910 undergraduates and 2,809 graduate students, Rice's undergraduate student-to-faculty ratio is 6-to-1. Its residential college system builds close-knit communities and lifelong friendships, just one reason why Rice is ranked No. 1 for best quality of life and for lots of race/class interaction by the Princeton Review. Rice is also rated as a best value among private universities by Kiplinger's Personal Finance. To read "What they're saying about Rice," go to http://tinyurl.
David Ruth | EurekAlert!
Physicists gain new insights into nanosystems with spherical confinement
27.07.2017 | Johannes Gutenberg Universitaet Mainz
Getting closer to porous, light-responsive materials
26.07.2017 | Kyoto University
Physicists working with researcher Oriol Romero-Isart devised a new simple scheme to theoretically generate arbitrarily short and focused electromagnetic fields. This new tool could be used for precise sensing and in microscopy.
Microwaves, heat radiation, light and X-radiation are examples for electromagnetic waves. Many applications require to focus the electromagnetic fields to...
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...
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...
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...
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...
26.07.2017 | Event News
21.07.2017 | Event News
19.07.2017 | Event News
27.07.2017 | Life Sciences
27.07.2017 | Life Sciences
27.07.2017 | Health and Medicine