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Carbon Nanohoops: Molecular Templates for Precision Nanotube Synthesis

Lawrence Berkeley National Laboratory

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Technology Marketing SummaryRamesh Jasti and Carolyn Bertozzi of Berkeley Lab have developed a technique to build carbon-ring “nanohoops,” molecular building blocks for the formation of carbon nanotubes. Carbon nanohoops might serve as seeds, or templates, for the efficient and large-scale synthesis of nanotubes of exceptional precision and uniformity. Nanohoops are cycloparaphenylenes, carbon-ring structures that are the smallest sub-units of “armchair” nanotubes, which have unique electrical and optical properties. The armchair form is characterized by thin walls and a much higher conductivity than copper. DescriptionCurrent nanotube production techniques result in low yields. Bulk scale production has not been feasible, because desired structures must be sorted from batches of randomly varied nanotube architectures and traits. This mixture of atomic arrangements produces carbon nanotubes with vastly different electrical and optical properties, a significant hurdle for their use in advanced nanotechnology applications. The successful production of cycloparaphenylene nanohoops could lead to the preparation of carbon nanotubes with a predefined arrangement of atoms. This rational design process would sidestep the arduous and inefficient separation methods currently used to harvest carbon nanotubes of a desired kind.

Long before carbon nanotubes were conceived of, organic chemists were intrigued by the striking symmetrical structure of cycloparaphenylenes. Since the early 1930’s, attempts to synthesize them have failed due to the tendency of carbon atoms to organize in planar, rather than curved structures. The Berkeley Lab team solved this longstanding structural chemistry challenge by discovering a method to bend carbon components into arcs that subsequently can be assembled into hoops.
Benefits* Produce smallest building block of an armchair nanotube
* Serve as templates for making uniform nanotube structures at high yields
* Permit rational design of nanotubes
* Method may be used to synthesize other nanotube structures
Applications and Industries* Semiconductors
* Photonics
* Photovoltaics
More InformationJasti, R., Bhattacharjee, J., Neaton, J.B., Bertozzi, C.R. “Synthesis, Characterization, and Theory of [9]-,[12]-, and [18]Cycloparaphenylene: Carbon Nanohoop Structures,” J. Am. Chem. Soc. 130:17646-17647 (2008)

Jasti, R., Bertozzi, C.R. “Progress and challenges for the bottom-up synthesis of carbon nanotubes with discrete chirality,” Chemical Physics Letters 494:1-7 (2010)
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
IB-2753Prototype - Bench scale prototype. Available - Patent pending. Available for licensing or collaborative research.01/21/201101/21/2011

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