Abstract
A systematic study of the Cu-catalyzed chemical vapor deposition of graphene under extremely low partial pressure is carried out. A carbon precursor supply of just P CH4∼ 0.009 mbar during the deposition favors the formation of large-area uniform monolayer graphene verified by Raman spectra. A diluted HNO 3 solution is used to remove Cu before transferring graphene onto SiO 2/Si substrates or carbon grids. The graphene can be made suspended over a ∼12 μm distance, indicating its good mechanical properties. Electron transport measurements show the graphene sheet resistance of ∼0.6 kΩ/□ at zero gate voltage. The mobilities of electrons and holes are ∼1800 cm 2/Vs at 4.2 K and ∼1200 cm 2/Vs at room temperature.
Original language | English |
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Article number | 5966348 |
Pages (from-to) | 255-260 |
Number of pages | 6 |
Journal | IEEE Transactions on Nanotechnology |
Volume | 11 |
Issue number | 2 |
DOIs | |
Publication status | Published - Mar 2012 |
Keywords
- Chemical vapor deposition
- graphene
- low partial pressure
- nanoelectronics
- wet transfer
ASJC Scopus subject areas
- Computer Science Applications
- Electrical and Electronic Engineering