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Adsorbate-induced curvature and stiffening of graphene.

Svatek SA, Scott OR, Rivett JP, Wright K, Baldoni M, Bichoutskaia E, Taniguchi T, Watanabe K, Marsden AJ, Wilson NR, Beton PH - Nano Lett. (2014)

Bottom Line: This effect arises from a curvature-dependent variation of a moiré pattern due to the mismatch of the carbon-carbon separation in the adsorbed molecule and the period of graphene.The effect is observed when graphene is transferred onto a deformable substrate, which in our case is the interface between water layers adsorbed on mica and an organic solvent, but is not observed on more rigid substrates such as boron nitride.Our results show that molecular adsorption can be influenced by substrate curvature, provide an example of two-dimensional molecular self-assembly on a soft, responsive interface, and demonstrate that the mechanical properties of graphene may be modified by molecular adsorption, which is of relevance to nanomechanical systems, electronics, and membrane technology.

View Article: PubMed Central - PubMed

Affiliation: School of Physics and Astronomy, University of Nottingham , Nottingham NG7 2RD, United Kingdom.

ABSTRACT
The adsorption of the alkane tetratetracontane (TTC, C44H90) on graphene induces the formation of a curved surface stabilized by a gain in adsorption energy. This effect arises from a curvature-dependent variation of a moiré pattern due to the mismatch of the carbon-carbon separation in the adsorbed molecule and the period of graphene. The effect is observed when graphene is transferred onto a deformable substrate, which in our case is the interface between water layers adsorbed on mica and an organic solvent, but is not observed on more rigid substrates such as boron nitride. Our results show that molecular adsorption can be influenced by substrate curvature, provide an example of two-dimensional molecular self-assembly on a soft, responsive interface, and demonstrate that the mechanical properties of graphene may be modified by molecular adsorption, which is of relevance to nanomechanical systems, electronics, and membrane technology.

No MeSH data available.


Related in: MedlinePlus

Comparison of the variationof heights across the lamellar rows for TTC adsorbed on differentsubstrates (extracted from images in Figure 1). For TTC on G/BN and G/mica with 1–3 water layers, the corrugationamplitude is below 0.1 nm. A larger and more regular corrugation isfound for >3 layers.
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fig2: Comparison of the variationof heights across the lamellar rows for TTC adsorbed on differentsubstrates (extracted from images in Figure 1). For TTC on G/BN and G/mica with 1–3 water layers, the corrugationamplitude is below 0.1 nm. A larger and more regular corrugation isfound for >3 layers.

Mentions: A comparison of the variation of heights across thelamellar rows for TTC adsorbed on different substrates is shown inFigure 2. When adsorbed on G/hBN the heightvariation is very low (<0.03 nm). On G/mica with 1–3 trappedwater layers the periodic structure is larger than, but still comparableto, the background roughness ∼0.05 nm. However, when adsorbedon regions where there are >3 trapped water layers, the heightvariation shows a clear periodicity with a peak-to-peak height of0.20–0.25 nm; these changes indicate that the underlying graphenesubstrate is deformable in regions where there are multiple trappedwater layers, and adopts a corrugated conformation.


Adsorbate-induced curvature and stiffening of graphene.

Svatek SA, Scott OR, Rivett JP, Wright K, Baldoni M, Bichoutskaia E, Taniguchi T, Watanabe K, Marsden AJ, Wilson NR, Beton PH - Nano Lett. (2014)

Comparison of the variationof heights across the lamellar rows for TTC adsorbed on differentsubstrates (extracted from images in Figure 1). For TTC on G/BN and G/mica with 1–3 water layers, the corrugationamplitude is below 0.1 nm. A larger and more regular corrugation isfound for >3 layers.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4326047&req=5

fig2: Comparison of the variationof heights across the lamellar rows for TTC adsorbed on differentsubstrates (extracted from images in Figure 1). For TTC on G/BN and G/mica with 1–3 water layers, the corrugationamplitude is below 0.1 nm. A larger and more regular corrugation isfound for >3 layers.
Mentions: A comparison of the variation of heights across thelamellar rows for TTC adsorbed on different substrates is shown inFigure 2. When adsorbed on G/hBN the heightvariation is very low (<0.03 nm). On G/mica with 1–3 trappedwater layers the periodic structure is larger than, but still comparableto, the background roughness ∼0.05 nm. However, when adsorbedon regions where there are >3 trapped water layers, the heightvariation shows a clear periodicity with a peak-to-peak height of0.20–0.25 nm; these changes indicate that the underlying graphenesubstrate is deformable in regions where there are multiple trappedwater layers, and adopts a corrugated conformation.

Bottom Line: This effect arises from a curvature-dependent variation of a moiré pattern due to the mismatch of the carbon-carbon separation in the adsorbed molecule and the period of graphene.The effect is observed when graphene is transferred onto a deformable substrate, which in our case is the interface between water layers adsorbed on mica and an organic solvent, but is not observed on more rigid substrates such as boron nitride.Our results show that molecular adsorption can be influenced by substrate curvature, provide an example of two-dimensional molecular self-assembly on a soft, responsive interface, and demonstrate that the mechanical properties of graphene may be modified by molecular adsorption, which is of relevance to nanomechanical systems, electronics, and membrane technology.

View Article: PubMed Central - PubMed

Affiliation: School of Physics and Astronomy, University of Nottingham , Nottingham NG7 2RD, United Kingdom.

ABSTRACT
The adsorption of the alkane tetratetracontane (TTC, C44H90) on graphene induces the formation of a curved surface stabilized by a gain in adsorption energy. This effect arises from a curvature-dependent variation of a moiré pattern due to the mismatch of the carbon-carbon separation in the adsorbed molecule and the period of graphene. The effect is observed when graphene is transferred onto a deformable substrate, which in our case is the interface between water layers adsorbed on mica and an organic solvent, but is not observed on more rigid substrates such as boron nitride. Our results show that molecular adsorption can be influenced by substrate curvature, provide an example of two-dimensional molecular self-assembly on a soft, responsive interface, and demonstrate that the mechanical properties of graphene may be modified by molecular adsorption, which is of relevance to nanomechanical systems, electronics, and membrane technology.

No MeSH data available.


Related in: MedlinePlus