Tuning of Graphene Work Function by Alkyl Chain Length in Amine-Based Compoundsopen access
- Authors
- Bae, Sa-Rang; Lee, Tae Won; Park, Kwangyong; Kim, Soo Young
- Issue Date
- Mar-2019
- Publisher
- KOREAN INST METALS MATERIALS
- Keywords
- Graphene; Work function; Amine-based compounds; n-doping
- Citation
- ELECTRONIC MATERIALS LETTERS, v.15, no.2, pp 141 - 148
- Pages
- 8
- Journal Title
- ELECTRONIC MATERIALS LETTERS
- Volume
- 15
- Number
- 2
- Start Page
- 141
- End Page
- 148
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/18161
- DOI
- 10.1007/s13391-018-00109-4
- ISSN
- 1738-8090
2093-6788
- Abstract
- In this study, the effect of alkyl chain length in amine-based compounds on the work function of graphene was investigated. The graphene was synthesized by the chemical vapor deposition method. The graphene layers were functionalized by amine-based groups using a simple spin-coating method. The amine-based compounds were composed of phenyl amine and methyl-, ethyl-, propyl-, n/t-butyl-, and octyl-phenyl amine groups. Materials were confirmed by X-ray photoelectron spectroscopy to show the C and N bonding. The work function of the doped graphene layers decreased because of the effect of the doping agents. Among the doped graphene samples, t-butyl-phenyl amine functionalized graphene achieved the lowest work function of 3.89eV (compared with 4.43eV for pristine graphene). Further, the sheet resistance of n-doped graphene increased, confirming the high concentration of n-doping agents on the graphene layers. These results suggest the best alkyl chain is the t-butyl group to reduce the work function of graphene, and promise the use of these materials as cathodes for opto-electronic applications. [GRAPHICS]
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