Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 1, Issue 2, Pages 505-509Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz900351w
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Funding
- Ministry of Education, Science and Technology [2009-0083525]
- Sookmyung Women's University
- National Research Foundation of Korea [2009-0093113] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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