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Covalent Functionalization of Epitaxial Graphene by Azidotrimethylsilane

Authors
Choi, JunghunKim, Ki-jeongKim, BongsooLee, HangilKim, Sehun
Issue Date
Jun-2009
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY C, v.113, no.22, pp.9433 - 9435
Journal Title
JOURNAL OF PHYSICAL CHEMISTRY C
Volume
113
Number
22
Start Page
9433
End Page
9435
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/13735
DOI
10.1021/jp9010444
ISSN
1932-7447
Abstract
Chemically modified epitaxial graphene (EG) by azidotrimethylsilane (ATS) was investigated using high-resolution photoemission spectroscopy (HRPES). Through the spectral analysis, we clearly confirmed that EG is modified by thermally generated nitrene radicals and found that the bonding nature between the nitrene radicals and EG is covalent. As we observe bonding nature of N 1s peaks, we found that two distinct N peaks can be clearly distinguished in the spectra. Using a covalently bound stretched graphene (CSG) model, we elucidated that nitrene radicals adsorb on the graphene layer at two different adsorption sites. Moreover, we were able to control the band gap of EG using valence band spectra as we change the amount of the dosing of nitrene.
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