Journal
ACS NANO
Volume 7, Issue 3, Pages 2842-2849Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn400443u
Keywords
magnetic force microscopy; MoS2; graphene; nanosheet; phase shift
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Funding
- MOE under AcRF [ARC 10/10, MOE2010-T2-1-060]
- Singapore National Research Foundation
- NTU in Singapore [M4080865.070.706022]
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For the first time, magnetic force microscopy (MFM) is used to characterize the mechanically exfoliated single- and few-layer MoS2 and graphene nanosheets. By analysis of the phase and amplitude shifts, the magnetic response of MoS2 and graphene nanosheets exhibits the dependence on their layer number. However, the solution-processed single-layer MoS2 nanosheet shows the reverse magnetic signal to the mechanically exfoliated one, and the graphene oxide nanosheet has not shown any detectable magnetic signal. Importantly, graphene and MoS2 flakes become nonmagnetic when they exceed a certain thickness.
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