A new form of carbon: Grossly warped 'nanographene'

Jul 15, 2013
A new form of carbon: Grossly warped 'nanographene'
Chemists at Boston College and Nagoya University in Japan have synthesized the first example of a new form of carbon. The new material consists of multiple identical pieces of "grossly warped graphene," each containing exactly 80 carbon atoms joined together in a network of 26 rings, with 30 hydrogen atoms decorating the rim. Because they measure slightly more than a nanometer across, these individual molecules are referred to generically as "nanocarbons." Credit: Nature Chemistry

Chemists at Boston College and Nagoya University in Japan have synthesized the first example of a new form of carbon, the team reports in the most recent online edition of the journal Nature Chemistry.

The new material consists of multiple identical pieces of grossly warped graphene, each containing exactly 80 carbon atoms joined together in a network of 26 rings, with 30 decorating the rim. Because they measure slightly more than a nanometer across, these individual molecules are referred to generically as "nanocarbons," or more specifically in this case as "grossly warped nanographenes."

Until recently, scientists had identified only two forms of pure carbon: diamond and graphite. Then in 1985, chemists were stunned by the discovery that carbon atoms could also join together to form hollow balls, known as fullerenes. Since then, scientists have also learned how to make long, ultra-thin, of carbon atoms, known as carbon nanotubes, and large flat single sheets of carbon atoms, known as graphene. The discovery of fullerenes was awarded the Nobel Prize in Chemistry in 1996, and the preparation of graphene was awarded the Nobel Prize in Physics in 2010.

Graphene sheets prefer planar, 2-dimensional geometries as a consequence of the hexagonal, chicken wire-like, arrangements of trigonal carbon atoms comprising their two-dimensional networks. The new form of carbon just reported in Nature Chemistry, however, is wildly distorted from planarity as a consequence of the presence of five 7-membered rings and one 5-membered ring embedded in the of .

Odd-membered-ring defects such as these not only distort the sheets of atoms away from planarity, they also alter the physical, optical, and electronic properties of the material, according to one of the principle authors, Lawrence T. Scott, the Jim and Louise Vanderslice and Family Professor of Chemistry at Boston College.

"Our new grossly warped nanographene is dramatically more soluble than a planar nanographene of comparable size," said Scott, "and the two differ significantly in color, as well. Electrochemical measurements revealed that the planar and the warped nanographenes are equally easily oxidized, but the warped nanographene is more difficult to reduce."

Graphene has been highly touted as a revolutionary material for nanoscale electronics. By introducing multiple odd-membered ring defects into the graphene lattice, Scott and his collaborators have experimentally demonstrated that the electronic properties of graphene can be modified in a predictable manner through precisely controlled chemical synthesis.

Explore further: Imperfect graphene renders 'electrical highways'

More information: A grossly warped nanographene and the consequences of multiple odd-membered-ring defects Nature Chemistry (2013) doi:10.1038/nchem.1704

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hemitite
3.3 / 5 (4) Jul 15, 2013
It's corduroy carbon!
barakn
2.8 / 5 (4) Jul 17, 2013
If it' has hydrogen, then exactly how is it a new form of carbon? Seems to me it is merely a hydrocarbon.
FastEddy
1.5 / 5 (8) Jul 17, 2013
If it' has hydrogen, then exactly how is it a new form of carbon? Seems to me it is merely a hydrocarbon.


Of course, but purity and nano-scale alignment are key … and that would be hydrocarbon without the hydro = little or no Hydrogen present.

"… 80 carbon atoms joined together in a network of 26 rings, with 30 hydrogen atoms decorating the rim …"

Hydrocarbons would have significantly more Hydrogen present forming molecules of CH4 and more complex forms.

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