TITLE

Direct determination of the crystallographic orientation of graphene edges by atomic resolution imaging

AUTHOR(S)
Neubeck, S.; You, Y. M.; Ni, Z. H.; Blake, P.; Shen, Z. X.; Geim, A. K.; Novoselov, K. S.
PUB. DATE
August 2010
SOURCE
Applied Physics Letters;8/2/2010, Vol. 97 Issue 5, p053110
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In this letter, we show how high-resolution scanning tunneling microscopy (STM) imaging can be used to reveal that certain edges of micromechanically exfoliated single layer graphene crystals on silicon oxide follow either zigzag or armchair orientation. Using the cleavage technique, graphene flakes are obtained that very often show terminating edges seemingly following the crystallographic directions of the underlying honeycomb lattice. Performing atomic resolution STM-imaging on such flakes, we were able to directly prove this assumption. Raman imaging carried out on the same flakes further validated our findings.
ACCESSION #
52802634

 

Related Articles

  • Scanning tunnelling microscopy and spectroscopy of ultra-flat graphene on hexagonal boron nitride. Jiamin Xue; Sanchez-Yamagishi, Javier; Bulmash, Danny; Jacquod, Philippe; Deshpande, Aparna; Watanabe, K.; Taniguchi, T.; Jarillo-Herrero, Pablo; LeRoy, Brian J. // Nature Materials;Apr2011, Vol. 10 Issue 4, p282 

    Graphene has demonstrated great promise for future electronics technology as well as fundamental physics applications because of its linear energy-momentum dispersion relations which cross at the Dirac point. However, accessing the physics of the low-density region at the Dirac point has been...

  • Incomplete screening by epitaxial graphene on the Si face of 6H–SiC(0001). Sandin, Andreas; Pronschinske, Alex; Rowe, J. E. (Jack); Dougherty, Daniel B. // Applied Physics Letters;9/13/2010, Vol. 97 Issue 11, p113104 

    A biased scanning tunneling microscope (STM) tip is used to study the ability of carriers in graphene to screen external electrostatic fields by monitoring the effect of tunneling-junction width on the position of image potential-derived surface states. These states are unusually sensitive to...

  • Epitaxial graphene on step bunching of a 6H-SiC(0001) substrate: Aromatic ring pattern and Van Hove singularities. Ridene, M.; Wassmann, T.; Pallecchi, E.; Rodary, G.; Girard, J. C.; Ouerghi, A. // Applied Physics Letters;3/18/2013, Vol. 102 Issue 11, p111610 

    We report on scanning tunneling microscopy and spectroscopy (STM/STS) investigations of graphene grown on a 6H-SiC(0001) substrate. Our STM images of a graphene layer on a step bunching of the SiC feature a ([Square_Root]3 × [Square_Root]3)R30° pattern of aromatic rings and well...

  • Design of a new reactor-like high temperature near ambient pressure scanning tunneling microscope for catalysis studies. (Feng) Tao, Franklin; Nguyen, Luan; Zhang, Shiran // Review of Scientific Instruments;Mar2013, Vol. 84 Issue 3, p034101 

    Here, we present the design of a new reactor-like high-temperature near ambient pressure scanning tunneling microscope (HT-NAP-STM) for catalysis studies. This HT-NAP-STM was designed for exploration of structures of catalyst surfaces at atomic scale during catalysis or under reaction...

  • Surface intercalation of gold underneath a graphene monolayer on SiC(0001) studied by scanning tunneling microscopy and spectroscopy. Premlal, B.; Cranney, M.; Vonau, F.; Aubel, D.; Casterman, D.; De Souza, M. M.; Simon, L. // Applied Physics Letters;6/29/2009, Vol. 94 Issue 26, p263115 

    The effects of gold deposition on monolayer graphene (MG) epitaxied on SiC (0001) substrate are examined via scanning tunneling microscopy and scanning tunneling spectroscopy (STS). Two types of surfaces with distinctive topography are demonstrated: (i) intercalated gold clusters having no...

  • Molecular dynamics study of energetics of graphene flakes. Nakajima, Takaaki; Shintani, K. // Journal of Applied Physics;Dec2009, Vol. 106 Issue 11, p114305 

    Molecular dynamics simulations for graphene flakes of various shapes are performed. The equilibrium structures of graphene flakes are obtained. Round, hexagonal, and rectangular graphene flakes are dealt with, and their sizes are varied from a few angstroms to 200 Ã…. It is shown that for...

  • Olympicene: smallest possible five rings.  // TCE: The Chemical Engineer;Jul2012, Issue 853, p20 

    A photograph which shows the smallest possible five-ringed structure called olympicene is presented.

  • Fast transient charging at the graphene/SiO2 interface causing hysteretic device characteristics. Young Gon Lee; Chang Goo Kang; Uk Jin Jung; Jin Ju Kim; Hyeon Jun Hwang; Hyun-Jong Chung; Sunae Seo; Rino Choi; Byoung Hun Lee // Applied Physics Letters;5/2/2011, Vol. 98 Issue 18, p183508 

    Device instabilities of graphene metal-oxide-semiconductor field effect transistors such as hysteresis and Dirac point shifts have been attributed to charge trapping in the underlying substrate, especially in SiO2. In this letter, trapping time constants around 87 μs and 1.76 ms were...

  • Catalyst patterned growth of interconnecting graphene layer on SiO2/Si substrate for integrated devices. Yun-Hi Lee; Jong-Hee Lee // Applied Physics Letters;10/5/2009, Vol. 95 Issue 14, p143102 

    The authors report a simple site selective growth for producing interconnecting suspended graphene on SiO2/Si substrate. The outcome of the process depends on the thickness of the catalyst (Ni) and process ambient on SiO2/Si wafer by low pressure fast heating chemical-vapor deposition at 820...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics