Roughening and melting of Au(110) surfaces

Hoss, A.; Nold, Michael; Blanckenhagen, P. von; Meyer, O.

doi:10.1103/physrevb.45.8714

Cited by 65 publications

(32 citation statements)

References 26 publications

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“…31 This fact indicates that the single-layer desorption is expected to occur at a higher temperature, incompatible with the Au(110) substrate stability. 28 The VB data of the SLs confirm the strong molecule-substrate interaction, driven mainly by the central metal Fe and Co ions. Since CuPc presents the d z 2 orbital completely filled, at contrast with FePc and CoPc, its interaction with Au(110) is weaker, and as a consequence the CuPc SL desorbs at a lower temperature from the Au(110) surface.…”

Section: Resultsmentioning

confidence: 59%

“…The CuPc molecular layer presents a desorption peak at 700 K, while not any desorption peak is observed for FePc and CoPc up to 820 K, the maximum annealing temperature compatible with the Au(110) substrate stability. 28 Thus, while the FePc and CoPc SLs remain adsorbed on the Au(110) surface, the CuPc SL desorbs, demonstrating that a different interaction between these MPcs and Au(110) takes place in the SL coverage phase. Since the interaction of the molecules with the substrate is mainly driven by the charge transfer from metal states to the central metal ion, a dependence on the filling of the d-states is expected.…”

Section: Resultsmentioning

confidence: 99%

“…28 The XPS Fe-2p 3/2 core levels measured after each annealing step, are shown in Fig. 2, right panel.…”

Section: Resultsmentioning

confidence: 99%

“…6 The higher BE of the b 2g orbital for CoPc than for FePc is due to the higher occupation of the d-orbitals in CoPc with respect to the FePc. 5 The MPc thin films have been annealed at increasing temperatures, the molecular orbital intensity reduces due to multi-layer desorption, which is basically completed for both molecular layers above 600 K. At the highest temperature reachable without affecting the Au crystalline surface (820 K), 28 the typical HOMO of the TF is disappeared, while an energy-shifted orbital is present at about 1 eV for both FePc and CoPc, which we attribute to an interface HOMO (HOMO if ), and a further peak (I 0 ) emerges between the HOMO if and the Fermi level. The HOMO if is at almost the same energy for both FePc and CoPc SLs and it has been attributed to the macrocycle interaction through the π a 1u orbitals with the Au d states.…”

Section: Resultsmentioning

confidence: 99%

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Metal-phthalocyanine ordered layers on Au(110): Metal-dependent adsorption energy

Massimi

Angelucci

Gargiani

et al. 2014

The Journal of Chemical Physics

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Iron-phthalocyanine and cobalt-phthalocyanine chains, assembled along the Au(110)-(1×2) reconstructed channels, present a strong interaction with the Au metallic states, via the central metal ion. X-ray photoemission spectroscopy from the metal-2p core-levels and valence band high-resolution ultraviolet photoelectron spectroscopy bring to light signatures of the interaction of the metal-phthalocyanine single-layer with gold. The charge transfer from Au to the molecule causes the emerging of a metal-2p core level component at lower binding energy with respect to that measured in the molecular thin films, while the core-levels associated to the organic macrocycle (C and N 1s) are less influenced by the adsorption, and the macrocycles stabilize the interaction, inducing a strong interface dipole. Temperature Programmed Desorption experiments and photoemission as a function of temperature allow to estimate the adsorption energy for the thin-films, mainly due to the molecule-molecule van der Waals interaction, while the FePc and CoPc single-layers remain adsorbed on the Au surface up to at least 820 K. © 2014 AIP Publishing LLC

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Section: Resultsmentioning

confidence: 59%

Section: Resultsmentioning

confidence: 99%

“…28 The XPS Fe-2p 3/2 core levels measured after each annealing step, are shown in Fig. 2, right panel.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Metal-phthalocyanine ordered layers on Au(110): Metal-dependent adsorption energy

Massimi

Angelucci

Gargiani

et al. 2014

The Journal of Chemical Physics

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“…For non-spherical nanoparticles, a shape transformation into nanospheres 3 can be observed as the nanoparticle reduces its surface energy due to the applied heat. The melting of both spherical and rod-shaped gold nanoparticles can be interpreted in terms of surface melting [22][23][24][25], whereby there is a small difference in the melting temperatures for the different facets [26][27][28]. For gold nanorods the surface melting is accompanied by the transformation into nanospheres, which is explained by Insawa et al in Ref.…”

Section: Introductionmentioning

confidence: 99%

Thermal stability of mesoporous silica-coated gold nanorods with different aspect ratios

Gergely-Fülöp

Zámbó

Deák

2014

Materials Chemistry and Physics

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The effect of different temperatures (up to 900 °C) on the morphology of mesoporous silicacoated gold nanorods was systematically investigated. Gold nanorods with different aspect ratios (AR ranging from 2.5 to 4.3) were coated with a 15 nm thick mesoporous silica shell.Silicon supported monolayers of the particles were annealed in the temperature range of 300-900 °C. The resulting changes in particle morphology were investigated using scanning electron microscopy and visible wavelength extinction spectroscopy. The silica coating generally improved the stability of the nanorods from ca. 250 °C by several hundreds degree Celsius. For nanorods with AR<3 the shape and the aspect ratio change is only moderate up to 700 °C. At 900 °C these nanorods became spherical. For nanorods with AR>3, lower stability was found as the aspect ratio decrease was more significant and they transformed into spherical particles already at 700 °C. It was confirmed by investigating empty silica shells that the observed conformal change of the shell material when annealing core/shell particles is dictated by the deformation of the core particle. This also implies that a significant mechanical stress is exerted on the shell upon core deformation. In accordance with this, for the highest aspect ratio (AR~4) nanorod the shell breaks up at 900 °C and the gold cores were partially released and coalesced into large spherical particles.

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Phase transitions at Al and Au surfaces: Deconstruction, roughening and premelting

Blanckenhagen

1994

Ber Bunsenges Phys Chem

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A short outline of structural phase transitions at surfaces and their experimental verification will be given as an introduction, which will be followed by a review of experimental and theoretical results for Al and Au surfaces. We have studied Au(111)‐, Au(110)‐ and Au(100)‐surfaces by medium energy ion scattering (MEIS) experiments and Au(110)‐ as well as Al(110)‐surfaces by low energy electron diffraction (LEED) experiments. At the Au(110) (2×1)‐surface deconstruction is accompanied by the disappearance of monoatomic steps. At about 40 K above the deconstruction temperature roughening sets in. The rough surface begins to smoothen if due to the increasing diffusion the outermost layers start to transform into a quasi‐liquid state. The growth of the quasi‐liquid layer with increasing temperature follows a logarithmic law. Preroughening, roughening and premelting transitions have been detected at the Al(110)‐surface. Open questions regarding these phase transitions will be discussed.

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Roughening and melting of Au(110) surfaces

Cited by 65 publications

References 26 publications

Metal-phthalocyanine ordered layers on Au(110): Metal-dependent adsorption energy

Metal-phthalocyanine ordered layers on Au(110): Metal-dependent adsorption energy

Thermal stability of mesoporous silica-coated gold nanorods with different aspect ratios

Phase transitions at Al and Au surfaces: Deconstruction, roughening and premelting

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