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Week of July 25, 2010

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"Measurement of the elastic properties and intrinsic strength of monolayer graphene," by Changgu Lee, Xiaoding Wei, Jeffrey W. Kysar, and James Hone, Science, 321(5887): 385-8, 18 July 2008.

[Authors' affiliation: Columbia University, New York, NY]

Abstract: "We measured the elastic properties and intrinsic breaking strength of free-standing monolayer graphene membranes by nanoindentation in an atomic force microscope. The force-displacement behavior is interpreted within a framework of nonlinear elastic stress-strain response, and yields second- and third-order elastic stiffnesses of 340 newtons per meter (N m(-1)) and -690 N m(-1), respectively. The breaking strength is 42 N m(-1) and represents the intrinsic strength of a defect-free sheet. These quantities correspond to a Young's modulus of E = 1.0 terapascals, third-order elastic stiffness of D = -2.0 terapascals, and intrinsic strength of sigma(int) = 130 gigapascals for bulk graphite. These experiments establish graphene as the strongest material ever measured, and show that atomically perfect nanoscale materials can be mechanically tested to deformations well beyond the linear regime."

This 2008 report from Science was cited 43 times in current journal articles indexed by Clarivate Analytics during March-April 2010. During that two-month period, no other chemistry paper published in the last two years, aside from reviews, collected a higher citation total. Prior to the most recent bimonthly count, citations to the paper have accrued as follows:

January-February 2010: 36 citations
November-December 2009: 31
September-October 2009: 31
July-August 2009: 23
May-June 2009: 16
March-April 2009: 13
January-February 2009: 12
November-December 2008: 10
September-October 2008: 1

Total citations to date: 216

SOURCE: Hot Papers Database (Included with a subscription to the print newsletter Science Watch®, available from the Research Services Group of Thomson Reuters. Packaged on a CD that is mailed with each Science Watch issue, the Hot Papers Database contains data on hundreds of highly cited papers published during the last two years. User interface permits searching by author, organization, journal, field, and more. Total citations, as well as citations accrued during successive bimonthly periods, can be assessed and graphed. An updated CD containing the most recent bimonthly data is mailed with every new issue of Science Watch, six times a year. The CD also includes an electronic version of the Science Watch issue in HTML format, for personal desktop access.

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