Nanodragsters hit the street: Scientists roll agile hot rod out of micro-garage (Update)

Jan 06, 2010
The new "nanodragster" (left) may lead to molecular machines for manufacturing computer circuits and other electronic components. Credit: American Chemical Society

(PhysOrg.com) -- Chemists are getting better at building nanomachines, but Rice researchers continue to race ahead of the pack.

The latest work in a series of molecular machines that began with 2005's nanocar has produced what Rice University scientists James Tour and Kevin Kelly call a nanodragster for its characteristic hot-rod shape, with small wheels on a short axle in the front and large wheels on a long axle in the back.

Their research, reported in the American Chemical Society journal Organic Letters, is another step toward functional nanomachines that can be custom-built and set to work in microelectronics and other applications. Guillaume Vives, a postdoctoral research associate in Tour's lab, and JungHo Kang, a graduate student in the Department of Electrical and Computer Engineering, co-authored the paper.

What those wheels are made of matters most. Early nanocars rolled on simple carbon 60 molecules, aka buckyballs. But they were a drag, literally, as they would only turn on a gold surface in high heat, about 200 degrees Celsius.

Tour, Rice's T.T. and W.F. Chao Chair in Chemistry and a professor of mechanical engineering and materials science and of computer science, and his team found in previous research that wheels made of p-carborane, a cluster of carbon and boron atoms, operate at much lower temperatures. But they're more difficult to image with a scanning tunneling microscope because of their much weaker interaction with metallic surfaces.

The key to making nanodragsters, Tour said, was putting p-carborane wheels in the front and buckyballs in the back, getting the advantages of both. The front wheels roll easier, while the buckyballs grip the gold roadway well enough to be imaged by Kelly, an associate professor in the Department of Electrical and Computer Engineering at Rice. And the vehicle operates at a much lower temperature than previous nanovehicles.

"The trick to making these nanocars was to attach the smaller wheels first, then deactivate their reactive ends through carbon group attachments that we called 'scythes,' much like blades on the centers of classical chariot wheels," Tour said. "Then we could affix the larger C60 wheels to the rear axle."

The tiny hot rod, 1/25,000th the width of a human hair, has a chassis that rotates freely and allows the car to turn when one front wheel or the other is lifted, a behavior not seen in previous nanocars. Much to the researchers' amusement, in several of the images the nanodragsters appear to be "popping wheelies" with both front wheels raised off the surface, just like real dragsters at the start of a race.

Imaging at different temperatures to better understand the energy barriers associated with moving nanovehicles is not discussed in this paper, but the researchers are undertaking such work both on the original gold surfaces and on glass and other substrates. Obtaining greater control of their motion is also the subject of ongoing research.

Explore further: Thinnest feasible nano-membrane produced

More information: "Molecular Machinery: Synthesis of a 'Nanodragster'", pubs.acs.org/doi/abs/10.1021/ol902312m

Related Stories

Turning an axel mounted molecular wheel

Jan 23, 2007

Researchers at the Centre for Material Development and Structural Studies in Toulouse (CEMES-CNRS) and their colleagues at the Free University of Berlin have, for the first time, managed to control the rotation of a wheel ...

Nanocar inventor named Top Nanotech Innovator

Sep 21, 2006

Rice University chemist and nanocar inventor James Tour has been selected Innovator of the Year in Small Times magazine's Best of Small Tech Research Award competition. The awards recognize the best people, products and co ...

Molecular machines drive plasmonic nanoswitches

Feb 11, 2009

Plasmonics -- a possible replacement for current computing approaches -- may pave the way for the next generation of computers that operate faster and store more information than electronically-based systems and are smaller ...

Toward 'invisible electronics' and transparent displays

Feb 05, 2009

Researchers in California are reporting an advance toward the long-sought goal of "invisible electronics" and transparent displays, which can be highly desirable for heads-up displays, wind-shield displays, and electronic ...

Recommended for you

Thinnest feasible nano-membrane produced

Apr 17, 2014

A new nano-membrane made out of the 'super material' graphene is extremely light and breathable. Not only can this open the door to a new generation of functional waterproof clothing, but also to ultra-rapid filtration. The ...

Wiring up carbon-based electronics

Apr 17, 2014

Carbon-based nanostructures such as nanotubes, graphene sheets, and nanoribbons are unique building blocks showing versatile nanomechanical and nanoelectronic properties. These materials which are ordered ...

Making 'bucky-balls' in spin-out's sights

Apr 16, 2014

(Phys.org) —A new Oxford spin-out firm is targeting the difficult challenge of manufacturing fullerenes, known as 'bucky-balls' because of their spherical shape, a type of carbon nanomaterial which, like ...

User comments : 0

More news stories

'Exotic' material is like a switch when super thin

(Phys.org) —Ever-shrinking electronic devices could get down to atomic dimensions with the help of transition metal oxides, a class of materials that seems to have it all: superconductivity, magnetoresistance ...

Innovative strategy to facilitate organ repair

A significant breakthrough could revolutionize surgical practice and regenerative medicine. A team led by Ludwik Leibler from the Laboratoire Matière Molle et Chimie (CNRS/ESPCI Paris Tech) and Didier Letourneur ...

Health care site flagged in Heartbleed review

People with accounts on the enrollment website for President Barack Obama's signature health care law are being told to change their passwords following an administration-wide review of the government's vulnerability to the ...

Airbnb rental site raises $450 mn

Online lodging listings website Airbnb inked a $450 million funding deal with investors led by TPG, a source close to the matter said Friday.