Strong interaction between graphene edge and metal revealed by scanning tunneling microscopy

Hyo Won Kim; Jiyeon Ku; Wonhee Ko; Insu Jeon; Hyeokshin Kwon; Seunghwa Ryu; Se Jong Kahng; Sung Hoon Lee; Sung Woo Hwang; Hwansoo Suh

doi:10.1016/j.carbon.2014.06.071

Strong interaction between graphene edge and metal revealed by scanning tunneling microscopy

Hyo Won Kim
, Jiyeon Ku
, Wonhee Ko
, Insu Jeon
, Hyeokshin Kwon
, Seunghwa Ryu
, Se Jong Kahng
, Sung Hoon Lee
, Sung Woo Hwang
, Hwansoo Suh^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

The interaction between a graphene edge and the underlying metal is investigated through the use of scanning tunneling microscopy (STM) and density functional theory (DFT) calculations and found to influence the geometrical structure of the graphene edge and its electronic properties. STM study reveals that graphene nanoislands grow on a Pt(1 1 1) surface with the considerable bending of the graphene at the edge arising from the strong graphene-edge-Pt- substrate interactions. Periodic ripples along the graphene edge due to both the strong interaction and the lattice mismatch with the underlying metal were seen. DFT calculations confirm such significant bending and also reproduce the periodic ripples along the graphene edge. The highly distorted edge geometry causes strain-induced pseudo-magnetic fields, which are manifested as Landau levels in the scanning tunneling spectroscopy. The electronic properties of the graphene edge are thus concluded to be strongly influenced by the curvature rather than the localized states along the zigzag edge as was previously predicted.

Original language	English
Pages (from-to)	190-195
Number of pages	6
Journal	Carbon
Volume	78
DOIs	https://doi.org/10.1016/j.carbon.2014.06.071
Publication status	Published - 2014 Nov

Bibliographical note

Funding Information:
S. Ryu acknowledges the support of the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning ( 2013010091 ).

ASJC Scopus subject areas

General Chemistry
General Materials Science

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10.1016/j.carbon.2014.06.071

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title = "Strong interaction between graphene edge and metal revealed by scanning tunneling microscopy",

abstract = "The interaction between a graphene edge and the underlying metal is investigated through the use of scanning tunneling microscopy (STM) and density functional theory (DFT) calculations and found to influence the geometrical structure of the graphene edge and its electronic properties. STM study reveals that graphene nanoislands grow on a Pt(1 1 1) surface with the considerable bending of the graphene at the edge arising from the strong graphene-edge-Pt- substrate interactions. Periodic ripples along the graphene edge due to both the strong interaction and the lattice mismatch with the underlying metal were seen. DFT calculations confirm such significant bending and also reproduce the periodic ripples along the graphene edge. The highly distorted edge geometry causes strain-induced pseudo-magnetic fields, which are manifested as Landau levels in the scanning tunneling spectroscopy. The electronic properties of the graphene edge are thus concluded to be strongly influenced by the curvature rather than the localized states along the zigzag edge as was previously predicted.",

author = "Kim, \{Hyo Won\} and Jiyeon Ku and Wonhee Ko and Insu Jeon and Hyeokshin Kwon and Seunghwa Ryu and Kahng, \{Se Jong\} and Lee, \{Sung Hoon\} and Hwang, \{Sung Woo\} and Hwansoo Suh",

note = "Funding Information: S. Ryu acknowledges the support of the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT \& Future Planning ( 2013010091 ). ",

year = "2014",

month = nov,

doi = "10.1016/j.carbon.2014.06.071",

language = "English",

volume = "78",

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TY - JOUR

T1 - Strong interaction between graphene edge and metal revealed by scanning tunneling microscopy

AU - Kim, Hyo Won

AU - Ku, Jiyeon

AU - Ko, Wonhee

AU - Jeon, Insu

AU - Kwon, Hyeokshin

AU - Ryu, Seunghwa

AU - Kahng, Se Jong

AU - Lee, Sung Hoon

AU - Hwang, Sung Woo

AU - Suh, Hwansoo

N1 - Funding Information: S. Ryu acknowledges the support of the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning ( 2013010091 ).

PY - 2014/11

Y1 - 2014/11

N2 - The interaction between a graphene edge and the underlying metal is investigated through the use of scanning tunneling microscopy (STM) and density functional theory (DFT) calculations and found to influence the geometrical structure of the graphene edge and its electronic properties. STM study reveals that graphene nanoislands grow on a Pt(1 1 1) surface with the considerable bending of the graphene at the edge arising from the strong graphene-edge-Pt- substrate interactions. Periodic ripples along the graphene edge due to both the strong interaction and the lattice mismatch with the underlying metal were seen. DFT calculations confirm such significant bending and also reproduce the periodic ripples along the graphene edge. The highly distorted edge geometry causes strain-induced pseudo-magnetic fields, which are manifested as Landau levels in the scanning tunneling spectroscopy. The electronic properties of the graphene edge are thus concluded to be strongly influenced by the curvature rather than the localized states along the zigzag edge as was previously predicted.

AB - The interaction between a graphene edge and the underlying metal is investigated through the use of scanning tunneling microscopy (STM) and density functional theory (DFT) calculations and found to influence the geometrical structure of the graphene edge and its electronic properties. STM study reveals that graphene nanoislands grow on a Pt(1 1 1) surface with the considerable bending of the graphene at the edge arising from the strong graphene-edge-Pt- substrate interactions. Periodic ripples along the graphene edge due to both the strong interaction and the lattice mismatch with the underlying metal were seen. DFT calculations confirm such significant bending and also reproduce the periodic ripples along the graphene edge. The highly distorted edge geometry causes strain-induced pseudo-magnetic fields, which are manifested as Landau levels in the scanning tunneling spectroscopy. The electronic properties of the graphene edge are thus concluded to be strongly influenced by the curvature rather than the localized states along the zigzag edge as was previously predicted.

UR - https://www.scopus.com/pages/publications/84906307500

U2 - 10.1016/j.carbon.2014.06.071

DO - 10.1016/j.carbon.2014.06.071

M3 - Article

AN - SCOPUS:84906307500

SN - 0008-6223

VL - 78

SP - 190

EP - 195

JO - Carbon

JF - Carbon

ER -

Strong interaction between graphene edge and metal revealed by scanning tunneling microscopy

Abstract

Bibliographical note

ASJC Scopus subject areas

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