Influence of chemical interaction at the lattice-mismatchedh−BN∕Rh(111)and

Abstract

The atomic and electronic structure of the lattice-mismatched h-BN/Pt͑111͒ and h-BN/Rh͑111͒ interfaces formed by pyrolitic reactions with vaporized borazine has been studied by low-energy electron diffraction, scanning tunneling microscopy, x-ray-absorption spectroscopy, and core-level and valence-band photoemission. It has been found that on Pt͑111͒, h-BN forms a nearly flat monolayer, insignificantly corrugated across the supercell. On Rh͑111͒, h-BN grows in form of a nanomesh, as originally observed by Corso et al. ͓Science 303, 217 ͑2004͔͒. The structural difference between the h-BN/Pt͑111͒ and h-BN/Rh͑111͒ interfaces is associated with the strength of chemical interaction between h-BN and the substrate surface. A stronger orbital hybridization on Rh͑111͒ results in a stronger attraction of the monolayer to the metal surface at favorable adsorption sites resulting in a highly corrugated structure ͑nanomesh͒. It has been shown that the electronic structure of the outer ͑elevated͒ and inner ͑attracted to the surface͒ nanomesh sites is very different as a result of different chemical bonding to the substrate ͑weak and strong, respectively͒.

Dehalogenation and Coupling of a Polycyclic Hydrocarbon on an Atomically Thin Insulator

“…Empty dents are imaged as dark depressions. 18,23 while the adsorbed molecules exhibit a six petal flowerlike appearance originating from the apparent D 6 symmetric structure of a single I 6 -CHP. All molecules occupy single dents and are well-separated from each other and follow the same registry as the superstructure of the corrugated h-BN.…”

“…On Rh(111) the h-BN forms a highly corrugated "nanomesh" consisting of regions with strong bonding, dents (sometimes referred to as pores), separated by suspended wire regions, where the h-BN-Rh(111) interaction is weaker. 18,23,26,[29][30][31] Consequently, the structure of the corrugated h-BN is a superposition of the 0.25 nm BN lattice and the network of dents with a lattice constant of 3.2 nm.As we will show in the following, deposition of I 6 -CHP on the corrugated h-BN leads to a distinct adsorption geometry imposing a non-equivalency on the six iodine sites of the molecule, which is not intrinsic to the free I 6 -CHP. The adsorption geometry, sequential dehalogenation and the subsequent coupling of I x -CHP species are analyzed by low-temperature scanning tunneling microscopy (LT-STM at 5.5 K) and density functional theory (DFT).…”

“…16 The lack of electronic states close to the Fermi level will reduce the catalytic activity, whereas the ultimate thinness still allows the dehalogenation process to be studied by STM. Furthermore, the interaction between the metal and h-BN layer generates distinct superstructures that can be adjusted by a variation of the underlying metal (Ni, 17 Pt, 18 Cu, 19 Rh and Ru, 18,[20][21][22][23][24][25][26] Fe and Cr 27,28 ). On Rh(111) the h-BN forms a highly corrugated "nanomesh" consisting of regions with strong bonding, dents (sometimes referred to as pores), separated by suspended wire regions, where the h-BN-Rh(111) interaction is weaker.…”

“…On Rh(111) the h-BN forms a highly corrugated "nanomesh" consisting of regions with strong bonding, dents (sometimes referred to as pores), separated by suspended wire regions, where the h-BN-Rh(111) interaction is weaker. 18,23,26,[29][30][31] Consequently, the structure of the corrugated h-BN is a superposition of the 0.25 nm BN lattice and the network of dents with a lattice constant of 3.2 nm.…”

Boron Nitride on Cu(111): An Electronically Corrugated Monolayer

“…on various 3d, 4d and 5d transition metals 1,[20][21][22][23][24] . Depending on lattice mismatch, symmetry of the supporting surface and interaction strength between BN and metal, a variety of morphologies can be achieved: Uniform commensurate layers (Ni(111)) [25][26][27][28] , films exhibiting Moiré patterns (Pd(111), Pt(111), Pd(110)) [29][30][31] , strongly corrugated nanomesh topologies (Rh(111), Ru(0001)) 16,32 or one-dimensional superstructures (Cr(110), Fe(110)) 33,34 . For all the substrates addressed in a recent density-functional theory (DFT) study, the N atom in the BN layer is repelled from the metal while the B is attracted 35 .…”