Video shows nanotube spins as it grows

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– July 27, 2009Posted in: News Releases

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Video shows nanotube spins as it grows
Images show atom-by-atom growth of rotating carbon nanotubes

EDITORS: To obtain the video(s) and permission to publish them online, contact the American Chemical Society’s Copyright Office at copyright@acs.org. Request the video(s) included in the supplemental information of the article with DOI: 10.1021/nl901380u. Include the name of the publisher, mailing address, fax number and specific deadline date, as well as where the requested video(s) will appear.

New video showing the atom-by-atom growth of carbon nanotubes reveals they rotate as they grow, much like the halting motion of a mechanical clock’s second hand.


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VIDEO CREDIT: Video courtesy of S. Purcell, LPMCN/Université Lyon1/CNRS. Posted with permission from Nano Letters DOI: 10.1021/nl901380u. Copyright 2009 American Chemical Society.


FEM video from Université Lyon1/CNRS shows the rotation of the nanotube during growth. The observation helps confirm a new rotational theory of carbon nanotube growth offered by Rice researchers in February.

Published online this month by researchers at France’s Université Lyon1/CNRS and Houston’s Rice University, the research provides the first experimental evidence of how individual carbon atoms are added to growing nanotubes.

“The key issue for realizing the potential of carbon nanotubes has always been better control of their growth,” said team lead Stephen Purcell of the Université Lyon1/CNRS. “Our findings offer new insights for better measurement, modeling and control of nanotube growth.”

Carbon nanotubes are long, hollow cylinders of pure carbon. They are hair-like in shape but are about 100,000 times smaller than human hair. They are also about six times stronger than steel, conduct electricity as well as copper and are almost impervious to radiation and chemical destruction. As a result, scientists are keen to use them in superstrong, “smart” materials, but they need to better understand how to produce them.

“The images from Dr. Purcell’s lab show the atom-by-atom ‘self assembly’ of a nanotube,” said Rice co-author Boris Yakobson, professor in mechanical engineering and materials science and of chemistry. “The video offers compelling evidence of the rotational motion that accompanies nanotube growth. It brings to mind Galileo’s famous quote, ‘And yet, it does turn.'”

In February, Yakobson offered a new theory suggesting that nanotubes grow like tiny, woven tapestries, with new atoms attaching to twisting atomic threads. The new video appears to support the theory, indicating that atoms are added in pairs as the tube spins and grows.


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VIDEO CREDIT: Video courtesy of S. Purcell, LPMCN/Université Lyon1/CNRS. Posted with permission from Nano Letters DOI: 10.1021/nl901380u. Copyright 2009 American Chemical Society.


Bits of metal catalyst were placed at the tip of a field emission microscope (FEM) probe to catalyze the growth of carbon nanotubes. Electrons passing through the nanotube were scattered onto a camera, giving a top-down view of the growing nanotube (inset).

To create the images, Purcell’s team at LPMCN (Laboratoire de Physique de la Mati

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