Abstract
We studied the local voltage drop in functionalized graphene sheets of subμm size under external bias conditions by Kelvin probe force microscopy. Using this noninvasive experimental approach, we measured ohmic current-voltage characteristics and an intrinsic conductivity of about 3.7 × 10 5 S/m corresponding to a sheet resistance of 2.7 kΩ/sq under ambient conditions for graphene produced via thermal reduction of graphite oxide. The contact resistivity between functionalized graphene and metal electrode was found to be <6.3 × 10-7 Ωcm2.
Original language | English (US) |
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Pages (from-to) | 3543-3549 |
Number of pages | 7 |
Journal | Nano Letters |
Volume | 11 |
Issue number | 9 |
DOIs | |
State | Published - Sep 14 2011 |
All Science Journal Classification (ASJC) codes
- General Chemistry
- Condensed Matter Physics
- Mechanical Engineering
- Bioengineering
- General Materials Science
Keywords
- Functionalized graphene
- Kelvin probe force microscopy
- contact resistance
- electrical conductivity
- sheet resistance