On the plus side, they can withstand incredibly high heat, well over 1,100 degrees Celsius, says Yoke Khin Yap, an associate professor of physics at Michigan Technological University.
“Carbon nanotubes would burn like charcoal in a barbecue at half of those temperatures,” he says. And the electrical properties of BNNTs are remarkably uniform. Perfect insulators, boron nitride nanotubes could be doped with other materials to form designer semiconductors that could be used in high-powered electronics.
Unfortunately, making nanotubes from boron and nitrogen is easier said than done. “Making carbon nanotubes is simpler, like cooking,” says Yap. Boron nitride nanotubes, on the other hand, have always been fussy, requiring special instrumentation, dangerous chemistry, or temperatures of over 1,500 degrees Celsius to assemble. Even at that, the products are shot through with impurities.
“We’ve been stuck for more than 10 years because nobody could grow them well on substrates,” says Yap. “But now we can.”
As it turns out, boron nitride nanotubes just needed a little encouragement. Yap and his team have grown virtual Persian carpets of the tiny fibers on a substrate made from simple catalysts, magnesium oxide, iron or nickel. And they have managed it using the same instrumentation for growing carbon nanotubes, at about 1,100 degrees Celsius. And, their quality is perfect,.the present work. “I hope this encourages more researchers to grow BNNTs using the new technique,” said Yap.
The boron nitride nanotubes can be made to assemble exclusively on these catalysts, so the researchers can control precisely where they grow. “You could write ‘Michigan Tech’ in nanotubes,” says Yap.
These transparent nanotube sheets have another interesting property: they shed water like a duck’s back, a quality known as the lotus effect. “Water just slides away,” he says. “Anything coated with it would not only be stain resistant, it would be protected from anything water-soluble.” This superhydrophobicity holds at all pH levels, so anything coated with it would be protected from even the strongest acids and alkalies.
The research was funded through a National Science Foundation Career Grant. A paper detailing Yap’s discoveries, “Patterned Growth of Boron Nitride Nanotubes by Catalytic Chemical Vapor Deposition,” has been published online by the journal Chemistry of Materials.
Yap is the editor of the book “B-C-N Nanotubes and Related Nanostructures,” the first book on nanostructures constructed from one or multiple elements using boron, carbon, and nitrogen. He was the lead organizer of the Nanotubes and Related Nanostructures Symposium at the 2009 Materials Research Society Fall Meeting on. For more information, visit www.phy.mtu.edu/yap/research.html .
Michigan Technological University (mtu.edu) is a leading public research university developing new technologies and preparing students to create the future for a prosperous and sustainable world. Michigan Tech offers more than 130 undergraduate and graduate degree programs in engineering; forest resources; computing; technology; business; economics; natural, physical and environmental sciences; arts; humanities; and social sciences.
Marcia Goodrich | EurekAlert!
'Lipid asymmetry' plays key role in activating immune cells
20.02.2018 | Biophysical Society
New printing technique uses cells and molecules to recreate biological structures
20.02.2018 | Queen Mary University of London
For the first time, a team of researchers at the Max-Planck Institute (MPI) for Polymer Research in Mainz, Germany, has succeeded in making an integrated circuit (IC) from just a monolayer of a semiconducting polymer via a bottom-up, self-assembly approach.
In the self-assembly process, the semiconducting polymer arranges itself into an ordered monolayer in a transistor. The transistors are binary switches used...
Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale
Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...
For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.
But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...
Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.
The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...
Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters
Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...
15.02.2018 | Event News
13.02.2018 | Event News
12.02.2018 | Event News
20.02.2018 | Life Sciences
20.02.2018 | Medical Engineering
20.02.2018 | Physics and Astronomy