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

Aït-Mansour, Kamel; Cañas‐Ventura, Marta E.; Ruffieux, Pascal; Jaafar, Rached; Bieri, Marco; Rieger, Ralph; Müllen, Kläus; Fasel, Román; Gröning, Oliver

doi:10.1063/1.3240891

Cited by 8 publications

(10 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lattice strain is justified by the significantly different atomic sizes of RE and NM atoms. Achieving active control of these competing processes offers great potential to design moiré patterns with complex spin-dependent band structures and hence to template nanostructures for site-specific absorption of (organic) adsorbate, or the formation of heteromolecular nanostructures [53].…”

Section: Discussionmentioning

confidence: 99%

Atomic and mesoscopic structure of Dy-based surface alloys on noble metals

Mousavion

Maniraj

et al. 2022

New J. Phys.

View full text Add to dashboard Cite

Surface alloys are a highly tunable class of low dimensional materials with the opportunity to tune and control the spin and charge carrier functionalities on the nanoscale. Here, we focus on the atomic and mesoscopic structural details of three distinctive binary rare-earth-noble metals (RE/NM) surface alloys by employing scanning tunneling microscopy (STM) and low energy electron diffraction (LEED). Using Dysprosium as the guest element on fcc(111) noble metal substrates, we identify the formation of non-commensurate surface alloy superstructures which exhibit homogeneous moiré patterns for DyCu2/Cu (111) and DyAu2/Au(111), while an inhomogeneous one is found for DyAg2/Ag(111). The variations in the local structure are analyzed for all three surface alloys and the observed differences are discussed in the light of the lattice mismatches of the alloy layer with respect to the underlying substrate. For the particularly intriguing case of a Dy-Ag surface alloy, the surface alloy layer does not show a uniform long-range periodic structure, but consists of local hexagonal tiles separated by extended domain walls. These domain walls exist to relief the in-plane strain within the DyAg2 surface alloy layer. Our findings clearly demonstrate that surface alloying is an intriguing tool to tailor both the local atomic, but also the mesoscopic moiré structures of metallic heterostructures.

show abstract

Section: Discussionmentioning

confidence: 99%

Atomic and mesoscopic structure of Dy-based surface alloys on noble metals

Mousavion

Maniraj

et al. 2022

New J. Phys.

View full text Add to dashboard Cite

show abstract

“…This study was also extended to another template surface, the strain-relieved pattern formed by two monolayers of Ag on Pt (111). 306 It was shown that this template could also be used to control the orientation of the H-bonded rows by strong molecular pinning on the pattern.…”

Section: Chemical Reviewsmentioning

confidence: 97%

“…303 It was shown that this template could also be used to control the orientation of the H-bonded rows by strong molecular pinning on the pattern.…”

Section: Figure 11 Mono-and Bicomponent Self-assembly Of Bdatb 6-phmentioning

confidence: 99%

Bicomponent Supramolecular Architectures at the Vacuum–Solid Interface

et al. 2017

View full text Add to dashboard Cite

This review aims at giving the readers the basic concepts needed to understand two-dimensional bimolecular organizations at the vacuum–solid interface. The first part describes and analyzes molecules–molecules and molecules–substrates interactions. The current limitations and needs in the understanding of these forces are also detailed. Then, a critical analysis of the past and recent advances in the field is presented by discussing most of the key papers describing bicomponents self-assembly on solid surface in an ultrahigh vacuum environment. These sections are organized by considering decreasing molecule–molecule interaction strengths (i.e. starting from strong directional multiple H bonds up to weaker nondirectional bonds taking into account the increasing fundamental role played by the surface). Finally, we conclude with some research directions (predicting self-assembly, multi-components systems, and nonmetallic surfaces) and potential applications (porous networks and organic surfaces).

show abstract

“…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.…”

mentioning

confidence: 97%

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

et al. 2012

View full text Add to dashboard Cite

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...

show abstract

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

Cited by 8 publications

References 24 publications

Atomic and mesoscopic structure of Dy-based surface alloys on noble metals

Atomic and mesoscopic structure of Dy-based surface alloys on noble metals

Bicomponent Supramolecular Architectures at the Vacuum–Solid Interface

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

Contact Info

Product

Resources

About