Structural phase transition of Fe grown on Au(111)

Dekadjevi, D. T.; Hickey, B. J.; Brown, S. D.; Hase, Thomas P. A.; Fulthorpe, B. D.; Tanner, B. K.

doi:10.1103/physrevb.71.054108

Cited by 16 publications

(10 citation statements)

References 28 publications

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“…The results in ref. 32 are consistent with the formation of the Fe particles and the 110 diffraction peak in the XRD. The growth mechanism of the Fe NWs is schematically depicted in Scheme 1.…”

Section: Resultssupporting

confidence: 83%

Fe whisker growth revisited: effect of Au catalysis for [021̄] oriented nanowires with 100 nm diameter

et al. 2014

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Section: Resultssupporting

confidence: 83%

Fe whisker growth revisited: effect of Au catalysis for [021̄] oriented nanowires with 100 nm diameter

et al. 2014

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“…It is possible that a temperature of 75 °C is sufficient decompose adsorbed Fc(COOH) 2 on Au(111). The honeycomb feature appears to be atomic in nature, having a lattice constant of 4.4 Å, and thus adjacent atoms separated by 2.5 Å, and this is within the range observed for the growth of Fe atom monolayers on Au(111) . However, none of the reported structures for Fe on Au(111) are honeycomb lattices, so the exact identity of this feature is not definitively assigned.…”

Section: Resultsmentioning

confidence: 72%

“…The honeycomb feature appears to be atomic in nature, having a lattice constant of 4.4 Å, and thus adjacent atoms separated by 2.5 Å, and this is within the range observed for the growth of Fe atom monolayers on Au(111). 38 However, none of the reported structures for Fe on Au(111) are honeycomb lattices, so the exact identity of this feature is not definitively assigned. It is worth noting that the images in Figure 10 contain numerous chiral hexamers and tetramers, in addition to few or isolated tilted dimer rows.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Evolution of Metastable Clusters into Ordered Structures for 1,1′-Ferrocenedicarboxylic Acid on the Au(111) Surface

Brown¹,

Coman²,

Christie³

et al. 2017

J. Phys. Chem. C

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A series of experiments and electronic structure calculations were performed to identify metastable 1,1′-ferrocenedicarboxylic acid supramolecular structures formed during solution deposition in a vacuum on a Au(111) substrate, as well as to observe their evolution into more stable species under mild annealing conditions. Electrospray ionization mass spectrometry measurments were performed to determine which species are likely to be present in the rapidly evaporating droplet, and these experiments found that a hexamer can exist in solution during deposition, albeit as a metastable species. The molecular clusters present after solution deposition were observed and analyzed using ultrahigh-vacuum scanning tunneling microscopy, and the initial monolayer contains four basic classes of structures: ordered dimer domains, tilted dimer rows, square tetramers, and rectangular chiral hexamers. Electronic structure calculations indicate that the chiral hexamers consist of a central dimer surrounded by four molecules oriented to form birfurcated hydrogen bonds with other carboxylic acid groups and weaker hydrogen bonds with hydrogens from the aromatic rings. The calculations also indicated that the tetramers are clusters held together by carboxylic acid dimer bonds on each ring oriented perpendicular to each other, and that this conformation is slightly more stable than two dimers for a cluster of four molecules. Annealing this surface at 50 °C for 1 h results in the formation of both isolated tetramers and ordered tetramer rows at the expense of the end-to-end dimer domains, with few chiral hexamers remaining. Further annealing at 50 °C, as well as annealing at 65 °C drives the system to form chiral dimer domains, as well as several other minor structures. Annealing at 75 °C resulted in a dramatic decrease in apparent surface coverage, and most ordered structures existed as large tilted dimer rows, whether isolated or in ordered domains. This drop in surface coverage is likely due to some combination of decomposition of the molecule, desorption, or the growth of three-dimensional crystal structures. The observed coexistence of many forms of ordered dimer structures after annealing indicates that the equilbrium conformation of 1,1′-ferrocenedicarboxylic acid is some array of ordered dimers, and the variety of supramolecular structures present after annealing is an indicator that this system evolves under kinetically controlled growth conditions.

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“…From the structural point of view, when iron is deposited in vacuum on a fcc(111) metal surface, a crystalline structure phase transition fcc-Fe(111) → bcc-Fe(110) as a function of the film thickness is generally observed around a critical thickness of 2–3 atomic layers or monolayers (ML). This transition was observed on Ni(111), − Cu(111), − Pt(111), , and Au(111). − Surprisingly, this critical thickness seems to be quasi-independent of the lattice mismatch ε between fcc-Fe(111) and the substrate: ε ∼ +3% if fcc Fe(111) is deposited on Ni(111) but −12% if deposited on Au(111). For films thicker than 3 ML, the exact in plane orientation of the Fe bcc lattice with respect to the underlying fcc lattice has remained a matter of controversy (see ref and references therein) as to whether it follows the Nishiyama-Wassermann (NW) model or the Kurdjumov-Sachs (KS) model.…”

Section: Introductionmentioning

confidence: 97%

Epitaxial Electrodeposition of Fe on Au(111): Structure, Nucleation, and Growth Mechanisms

et al. 2016

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Iron epitaxial electrodeposition on Au(111) substrates is investigated using in situ scanning tunneling microscopy (STM) and ex situ X-ray diffraction (XRD). STM observations show that Fe grows quasi layer-by-layer at sufficiently negative potentials. XRD results indicate that Fe layers thicker than 3 ML are bcc and present the epitaxial relationship Fe(110) [1−10]||Au(111) [11−2]. They also show that the Fe lattice is uniaxially in-plane strained along Fe[1−10] and that the strain is progressively relieved with increasing layer thickness. The growth of Fe on a Ni layer deposited on Au(111) leads to strain free Fe layers with the same epitaxial relationship. The specific shape of Fe of monatomic islands suggests that the first Fe monolayer deposited on Au(111) presents a centered rectangular lattice similar to that of bcc Fe(110) but is stretched along Fe[1−10] by more than 8%.

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Structural phase transition of Fe grown on Au(111)

Cited by 16 publications

References 28 publications

Fe whisker growth revisited: effect of Au catalysis for [021̄] oriented nanowires with 100 nm diameter

Fe whisker growth revisited: effect of Au catalysis for [021̄] oriented nanowires with 100 nm diameter

Evolution of Metastable Clusters into Ordered Structures for 1,1′-Ferrocenedicarboxylic Acid on the Au(111) Surface

Epitaxial Electrodeposition of Fe on Au(111): Structure, Nucleation, and Growth Mechanisms

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