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Chemical Doping of Epitaxial Graphene by Organic Free Radicals

Authors
Choi, JunghunLee, HangilKim, Ki-jeongKim, BongsooKim, Sehun
Issue Date
Jan-2010
Publisher
AMER CHEMICAL SOC
Keywords
Catalysis; Interfaces; Surfaces
Citation
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, v.1, no.2, pp.505 - 509
Journal Title
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume
1
Number
2
Start Page
505
End Page
509
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/13287
DOI
10.1021/jz900351w
ISSN
1948-7185
Abstract
Chemical doping of epitaxial graphene (EG) by organic free radicals (4-amino-2,2,6,6-tetramethyl-1-piperridinyloxy; 4-amino-TEMPO) was investigated using scanning tunneling microscopy (STM), scanning tunneling spectroscopy (STS), and high resolution photoemission spectroscopy (HRPES). STM images revealed that the empty density of states near the adsorption site significantly decreased as a result of radical doping. STS indicated that 4-amino-TEMPO radicals acted as n-type doping characteristics.
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