Experimental and Simulation Studies on Relation Between Graphene Thickness and Its Force-distance Curve

doi:10.19596/j.cnki.1001-246x.8270

Abstract

Abstract:

Relation between graphene thickness and its force-distance curve is studied with atomic force microscope and first-principles calculations. Firstly, we located relatively smooth graphene sheets with atomic force microscope line-profile, and got three graphene samples with thickness of 0.57 nm, 0.90 nm and 1.30 nm. Then, we tested force-distance curves of the samples with multiple measurements. It shows that average value of adsorption forces of the samples are 0.30 nN, 0.32 nN and 0.34 nN, and the average value of desorption forces are 5.33 nN, 5.66 nN and 7.24 nN, respectively. It shows that both adsorption and desorption forces are increased with the increasing of graphene thickness, which implies that it could be an alternative method to measure thickness of graphene with force-distance curves provided by AFM. In order to explain the experimental result, we built platinum-graphene coherent interface models by combining Pt with one, two and three graphene layers, and calculated interface separation work with first-principles calculation. Simulation results showed that the interface separation work for the models are 10.0 eV·nm^-2, 10.4 eV·nm^-2 and 10.8 eV·nm^-2, respectively. It is consistent with the trend of adsorption forces in experiment.

Key words: graphene thickness, atomic force microscope, force-distance curve, first-principles

CLC Number:

O613.71

Yong FANG, Yongzhong JIN, Jian CHEN, Hongxiang ZONG, Liying ZHANG. Experimental and Simulation Studies on Relation Between Graphene Thickness and Its Force-distance Curve[J]. Chinese Journal of Computational Physics, 2021, 38(4): 441-446.

Figures/Tables 5

Fig.1 Coherent interface models of Pt(111) and single, double, and triple layer graphene

Fig.2 AFM images of graphene sheets with different thickness and height profiles (in nm) along the gray lines

Fig.3 AFM force-distance curve of graphene with height of 0.57 nm

Fig.4 Experimental adsorption and desorption forces of graphene with different thickness, mean values and standard errors of mean

Fig.5 Calculated Mulliken population differences between Pt and (a) single, (b) double and (c) triple layer of graphene

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