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Latest Pulickel Ajayan Stories

2010-05-26 11:27:29

Rice researchers print field-effect transistors with nano-infused ink Rice University researchers have discovered thin films of nanotubes created with ink-jet printers offer a new way to make field-effect transistors (FET), the basic element in integrated circuits. While the technique doesn't exactly scale down to the levels required for modern microprocessors, Rice's Robert Vajtai hopes it will be useful to inventors who wish to print transistors on materials of any kind, especially on...

2010-03-01 15:32:24

One-atom-thick sheet offers new microelectronic possibilities Rice University researchers have found a way to stitch graphene and hexagonal boron nitride (h-BN) into a two-dimensional quilt that offers new paths of exploration for materials scientists. The technique has implications for application of graphene materials in microelectronics that scale well below the limitations of silicon determined by Moore's Law. New research from the lab of Pulickel Ajayan, Rice's Benjamin M. and Mary...

2009-03-11 11:10:00

 New research from Rice University and the University of Oulu in Oulu, Finland, finds that carbon nanotubes could significantly improve the performance of electrical commutators that are common in electric motors and generators.The research, which appeared online this month in the journal Advanced Materials, finds that "brush contact" pads made of carbon nanotubes had 10 times less resistance than did the carbon-copper composite brushes commonly used today. Brush contacts are an integral...

2009-02-12 10:02:14

U.S. scientists say they have created hybrid carbon nanotube metal oxide arrays as electrode material to improve the performance of lithium batteries. Rice University researchers led by Professor Pulickel Ajayan said they conducted proof-of-concept research in which they grew nanotubes to look and act as the coaxial conducting lines used in cables. The coax tubes consist of a manganese oxide shell and a highly conductive nanotube core. We've put in two materials -- the nanotube, which is...

2009-02-10 08:54:04

Need to store electricity more efficiently? Put it behind bars. That's essentially the finding of a team of Rice University researchers who have created hybrid carbon nanotube metal oxide arrays as electrode material that may improve the performance of lithium-ion batteries.With battery technology high on the list of priorities in a world demanding electric cars and gadgets that last longer between charges, such innovations are key to the future. Electrochemical capacitors and fuel cells...

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2008-05-29 18:06:22

Designer 'nanobatons' could be used to trap oil, deliver drugs HOUSTON -- In a development that could lead to new technologies for cleaning up oil spills and polluted groundwater, scientists at Rice University have shown how tiny, stick-shaped particles of metal and carbon can trap oil droplets in water by spontaneously assembling into bag-like sacs. The tiny particles were found to assemble spontaneously by the tens of millions into spherical sacs as large as BB pellets around droplets of...

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2008-03-13 09:34:00

Scientists create robust quantum models to compare key characteristics of copper and CNTsResearchers at Rensselaer Polytechnic Institute have created a road map that brings academia and the semiconductor industry one step closer to realizing carbon nanotube interconnects, and alleviating the current bottleneck of information flow that is limiting the potential of computer chips in everything from personal computers to portable music players.To better understand and more precisely measure the...

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2008-01-17 11:30:00

On Tuesday, U.S. researchers announced that they have made the darkest material on Earth, a substance so black it absorbs more than 99.9 percent of light.The material, made from carbon nanotubes standing on end, is almost 30 times darker than a carbon substance used by the U.S. National Institute of Standards and Technology as the current benchmark of blackness. The material is close to the long-sought ideal black, which could absorb all colors of light and reflect none.The team led by Dr...

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2007-08-14 14:50:00

WASHINGTON -- It's a battery that looks like a piece of paper and can be bent or twisted, trimmed with scissors or molded into any shape needed. While the battery is only a prototype a few inches square right now, the researchers at Rensselaer Polytechnic Institute who developed it have high hopes for it in electronics and other fields that need smaller, lighter power sources. "We would like to scale this up to the point where you can imagine printing batteries like a newspaper. That would be...

2005-09-12 17:56:05

Troy, N.Y. "“ Diamonds have always been alluring, but now a team of scientists has made them truly magnetic -- on the nanoscale. In a paper published in the Aug. 26 issue of Physical Review Letters, the researchers report a technique to make magnetic diamond particles only 4-5 nanometers across. The tiny diamond magnets could find use in fields ranging from medicine to information technology. Ferromagnetism has been historically reserved for metals, but scientists are becoming...