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Large Physisorption Strain in Chemical Vapor Deposition of Graphene on Copper Substrates
He, Rui,Zhao, Liuyan,Petrone, Nicholas,Kim, Keun Soo,Roth, Michael,Hone, James,Kim, Philip,Pasupathy, Abhay,Pinczuk, Aron American Chemical Society 2012 Nano letters Vol.12 No.5
<P>Graphene single layers grown by chemical vapor deposition on single crystal Cu substrates are subject to nonuniform physisorption strains that depend on the orientation of the Cu surface. The strains are revealed in Raman spectra and quantitatively interpreted by molecular dynamics (MD) simulations. An average compressive strain on the order of 0.5% is determined in graphene on Cu(111). In graphene on Cu (100), MD simulations interpret the observed highly nonuniform strains.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2012/nalefd.2012.12.issue-5/nl300397v/production/images/medium/nl-2012-00397v_0001.gif'></P>
Dopant Segregation in Polycrystalline Monolayer Graphene
Zhao, Liuyan,He, Rui,Zabet-Khosousi, Amir,Kim, Keun Soo,Schiros, Theanne,Roth, Michael,Kim, Philip,Flynn, George W.,Pinczuk, Aron,Pasupathy, Abhay N. American Chemical Society 2015 Nano letters Vol.15 No.2
<P>Heterogeneity in dopant concentration has long been important to the electronic properties in chemically doped materials. In this work, we experimentally demonstrate that during the chemical vapor deposition process, in contrast to three-dimensional polycrystals, the substitutional nitrogen atoms avoid crystal grain boundaries and edges over micron length scales while distributing uniformly in the interior of each grain. This phenomenon is universally observed independent of the details of the growth procedure such as temperature, pressure, substrate, and growth precursor.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2015/nalefd.2015.15.issue-2/nl504875x/production/images/medium/nl-2014-04875x_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl504875x'>ACS Electronic Supporting Info</A></P>
Visualizing Individual Nitrogen Dopants in Monolayer Graphene
Zhao, L.,He, R.,Rim, K. T.,Schiros, T.,Kim, K. S.,Zhou, H.,Gutierrez, C.,Chockalingam, S. P.,Arguello, C. J.,Palova, L.,Nordlund, D.,Hybertsen, M. S.,Reichman, D. R.,Heinz, T. F.,Kim, P.,Pinczuk, A.,F American Association for the Advancement of Scienc 2011 Science Vol. No.