Template-Directed Molecular Nanostructures on the Ag/Pt(111) Dislocation Network

Aït-Mansour, Kamel; Treier, Matthias; Ruffieux, Pascal; Bieri, Marco; Jaafar, Rached; Gröning, P.; Fasel, Román; Gröning, Oliver

doi:10.1021/jp901378v

Cited by 19 publications

(18 citation statements)

References 44 publications

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“…5,6 Nevertheless, the TN exhibits remarkable template functions. Well-ordered sputter holes 5 and adsorbed organic molecules, [6][7][8] as well as strong spatial variations of the local work function 9 have been reported. A fundamental understanding of any template function evidently requires knowledge of its atomic structure.…”

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Interface-confined mixing and buried partial dislocations for Ag bilayer on Pt(111)

et al. 2012

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The trigonal strain-relief pattern formed by an Ag bilayer on Pt(111) is a prominent example for dislocation networks and their use as nanotemplates. However, its atomic structure has not been solved. Combining scanning tunneling microscopy, low-energy ion scattering, and x-ray photoelectron diffraction, we demonstrate that, unexpectedly, about 22% of the atoms exchange across the Ag/Pt interface, and that the partial dislocations defining the trigonal network are buried in the Pt interface layer. We present an embedded-atom-method simulation identifying the lowest energy structure compatible with all experimental findings. Strain-relief patterns formed by heteroepitaxial films act as templates for the self-assembly of highly ordered nanostructure superlattices. 1 The first system where the growth kinetics has been studied is a superlattice of Ag islands grown on a trigonal network (TN) formed by two monolayers (ML) of Ag/Pt(111). 2,3 The system has been modeled by assuming a network of surface Shockley partial dislocations 4 acting as repulsive line defects and thus confining the deposited Ag adatoms into the (25 × 25) unit cells. 2,3 However, the topmost Ag layer of the TN has recently been shown to be nearly perfectly hexagonal; hence there are no partial dislocations at the surface. 5,6 Nevertheless, the TN exhibits remarkable template functions. Well-ordered sputter holes 5 and adsorbed organic molecules, 6-8 as well as strong spatial variations of the local work function 9 have been reported. A fundamental understanding of any template function evidently requires knowledge of its atomic structure. 10 Despite considerable efforts, a realistic atomistic model has not yet been developed for the 2 ML Ag/Pt(111) TN.Silver on Pt(111) is a system with a particularly rich surface phase diagram. Submonolayers deposited at room temperature (RT) are pseudomorphic for islands smaller than 20 nm, whereas larger islands form surface partial dislocations. 11,12 Counterintuitively, the dislocations disappear at a full monolayer (defined as one Ag atom per Pt substrate atom), where the stress resulting from the misfit is largest. This has been related to the chemical adatom potential and to the presence of an adatom gas. 11 Further growth at RT leads to a striped phase (SP) 4,13 with pairs of partial dislocations. Upon annealing to 800 K the SP transforms into the stable TN structure. 4 Deposition of Ag submonolayers at higher temperature, or their annealing at T > 620 K, leads to a real mixture formed by monolayer Ag clusters embedded into the uppermost atomic substrate layer for a coverage < 0.5 ML and the reverse for 0.5 ML < < 1.0 ML. 14 This mixing has been confirmed by CO titration 15 and He-atom scattering 16 and is confined to the uppermost layer; hence, the name "surface alloy". 17 For 1.0 ML, especially for = 2 ML, Ag and Pt were believed to be phase separated up to the Ag desorption temperature.In this paper we report the surprising observation that the system mixes again for 2 ML Ag in the TN structure. This mi...

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Interface-confined mixing and buried partial dislocations for Ag bilayer on Pt(111)

et al. 2012

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“…Examples of solid nanotemplates are the natural herringbone reconstruction of Au͑111͒, 6 its vicinal surfaces 7 and self-organized surface patterns occurring in heteroepitaxial systems, 8,9 which have been previously used to influence the formation of molecular as well as atomic assemblies. 4,7,[9][10][11][12][13][14][15][16][17] The triangular strain-relief pattern formed by 2 monolayers ͑ML͒ of Ag on Pt͑111͒ 8 is particularly interesting because the bare terraces of this template surface show a high affinity for the site selective molecular adsorption and for the guidance of homomolecular nanostructures. [14][15][16][17] In this letter, by investigating the case of a bimolecular system on Ag/Pt͑111͒, we demonstrate the possibility of controlling the formation of surface structure-guided heteromolecular nanoassemblies from properly designed molecular building blocks.…”

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“…4,7,[9][10][11][12][13][14][15][16][17] The triangular strain-relief pattern formed by 2 monolayers ͑ML͒ of Ag on Pt͑111͒ 8 is particularly interesting because the bare terraces of this template surface show a high affinity for the site selective molecular adsorption and for the guidance of homomolecular nanostructures. [14][15][16][17] In this letter, by investigating the case of a bimolecular system on Ag/Pt͑111͒, we demonstrate the possibility of controlling the formation of surface structure-guided heteromolecular nanoassemblies from properly designed molecular building blocks. We associate two molecular species with complementary end-group functionalities, the 3,4,9,10-perylenetetracarboxylic diimide ͑PTCDI͒ and the 1,4-bis-͑2,4-diamino-1,3,5,-triazine͒-benzene ͑BDATB͒, and combine the bimolecular system related interaction with the laterally modulated substrate-molecule interaction on the strain-relief pattern.…”

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“…This is in line with our previous works demonstrating the high effectiveness of this template surface for controlling the formation of homomolecular ͑C 60 , PTCDI͒ nanostructures. [14][15][16][17] Significant work function variation from domain to domain on the strain-relief pattern is thought to be responsible for a more favorable molecular trapping in the hcp1 domains where the local work function is lowest. 15 This is especially the case of the PTCDI molecule which, further known to be an electron acceptor, 22 is expected to adsorb on low work function domains, as illustrated in the upper part of Fig.…”

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Strain-relief pattern as guide for the formation of surface-supported bimolecular nanoribbons

Aït-Mansour

Cañas‐Ventura

Ruffieux

et al. 2009

Applied Physics Letters

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We demonstrate the suitability of the Ag/Pt͑111͒ strain-relief pattern as efficient template for controlling the formation of well defined heteromolecular nanostructures. Two different species of molecular building blocks with complementary end-group functionalities are combined on this surface, which results in the formation of robust bimolecular nanoribbons driven by the interplay of the site specific adsorption on the strain-relief pattern with the highly directional intermolecular hydrogen-bonding intrinsic to the free bimolecular system.

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“…This so-called canted arrangement is in good agreement with the structure commonly observed for PTCDI molecules on metallic and insulating surfaces. 14,[17][18][19][20][21][22][23][24][25] The canted arrangement is similar to the (10 "…”

Section: (A) the Islands Appear Homogeneously Distributed With An Ismentioning

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Deposition Sequence Determines Morphology of C₆₀ and 3,4,9,10-Perylenetetracarboxylic Diimide Islands on CaF₂(111)

Loske

Reichling

Kühnle

2011

Jpn. J. Appl. Phys.

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The coadsorption of C 60 and 3,4,9,10-perylenetetracarboxylic diimide (PTCDI) molecules on atomically flat terraces of the CaF 2 (111) surface is studied under ultra-high vacuum conditions using non-contact atomic force microscopy (NC-AFM). Deposition of PTCDI molecules on CaF 2 (111) yields needle-shaped, molecularly well-ordered crystals. Upon following deposition of C 60 molecules, the PTCDI islands are completely covered by C 60 . For the opposite deposition order, the initially grown C 60 islands are not covered by PTCDI molecules, instead, most of the PTCDI molecules condense in pure islands, while only few PTCDI molecules nucleate at the edges of previously grown C 60 islands. Simultaneous deposition of both molecules results in an intermixed phase with yet another island morphology. The observed fundamental differences in island morphology suggest that different dewetting barriers are involved in the formation process. #

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Template-Directed Molecular Nanostructures on the Ag/Pt(111) Dislocation Network

Cited by 19 publications

References 44 publications

Interface-confined mixing and buried partial dislocations for Ag bilayer on Pt(111)

Interface-confined mixing and buried partial dislocations for Ag bilayer on Pt(111)

Strain-relief pattern as guide for the formation of surface-supported bimolecular nanoribbons

Deposition Sequence Determines Morphology of C₆₀ and 3,4,9,10-Perylenetetracarboxylic Diimide Islands on CaF₂(111)

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Template-Directed Molecular Nanostructures on the Ag/Pt(111) Dislocation Network

Cited by 19 publications

References 44 publications

Interface-confined mixing and buried partial dislocations for Ag bilayer on Pt(111)

Interface-confined mixing and buried partial dislocations for Ag bilayer on Pt(111)

Strain-relief pattern as guide for the formation of surface-supported bimolecular nanoribbons

Deposition Sequence Determines Morphology of C60 and 3,4,9,10-Perylenetetracarboxylic Diimide Islands on CaF2(111)

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Deposition Sequence Determines Morphology of C₆₀ and 3,4,9,10-Perylenetetracarboxylic Diimide Islands on CaF₂(111)