7 research outputs found
Gold on graphene as a substrate for surface enhanced Raman scattering study
In this paper, we report our study on gold (Au) films with different
thicknesses deposited on single layer graphene (SLG) as surface enhanced Raman
scattering (SERS) substrates for the characterization of rhodamine (R6G)
molecules. We find that an Au film with a thickness of ~7 nm deposited on SLG
is an ideal substrate for SERS, giving the strongest Raman signals for the
molecules and the weakest photoluminescence (PL) background. While Au films
effectively enhance both the Raman and PL signals of molecules, SLG effectively
quenches the PL signals from the Au film and molecules. The former is due to
the electromagnetic mechanism involved while the latter is due to the strong
resonance energy transfer from Au to SLG. Hence, the combination of Au films
and SLG can be widely used in the characterization of low concentration
molecules with relatively weak Raman signals.Comment: 11 pages, 4 figure
Origin of Contact Resistance at Ferromagnetic Metal-Graphene Interfaces
10.1021/acsnano.6b06286ACS NANO101211219-1122
Low Resistance Metal Contacts to MoS2 Devices with Nickel-Etched-Graphene Electrodes
ACS NANO91869-87
Tuning the threshold voltage of MoS2 field-effect transistors via surface treatment
10.1039/c5nr00253bNANOSCALE72410823-1083
Modification of thermal transport in few-layer MoS 2 by atomic-level defect engineering
10.1039/d1nr01832aNanoscale1311561-1156
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Length-dependent thermal conductivity in suspended single-layer graphene.
Graphene exhibits extraordinary electronic and mechanical properties, and extremely high thermal conductivity. Being a very stable atomically thick membrane that can be suspended between two leads, graphene provides a perfect test platform for studying thermal conductivity in two-dimensional systems, which is of primary importance for phonon transport in low-dimensional materials. Here we report experimental measurements and non-equilibrium molecular dynamics simulations of thermal conduction in suspended single-layer graphene as a function of both temperature and sample length. Interestingly and in contrast to bulk materials, at 300 K, thermal conductivity keeps increasing and remains logarithmically divergent with sample length even for sample lengths much larger than the average phonon mean free path. This result is a consequence of the two-dimensional nature of phonons in graphene, and provides fundamental understanding of thermal transport in two-dimensional materials