The preparation of smooth Au(110) and Cu(110) surfaces for biomolecular adsorption

Isted, G. E.; Martin, D. S.; Marnell, L; Weightman, P.

doi:10.1016/j.susc.2004.05.019

Cited by 7 publications

(10 citation statements)

References 15 publications

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“…The RA spectrum of the clean, well-ordered Au(110)-(1 × 2) surface at 300 K is shown in figure 1. This RA profile is characterized by features at 1.80, 2.52, 3.52 and 4.50 eV (labelled A-D in figure 1) and is in good agreement with previous RAS results of the clean (1 × 2) surface [3][4][5][6][7][8]. The RA spectrum of the Au(110) surface following Ar ion bombardment is also shown in figure 1.…”

Section: Resultssupporting

confidence: 89%

“…The Au(110) surface is of particular interest due to the variations in its structural anisotropy; the clean Au(110) surface exhibits a (1 × 2) missing row reconstruction at room temperature which converts to a disordered (1 × 1) phase at higher temperatures [2]. The Au(110)-(1 × 2) surface has been the focus of a number of RAS studies in UHV [3][4][5][6][7][8] and at the solid/liquid interface [4,[9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…The RA response of Au(110) has been found to be sensitive to surface reconstruction [3][4][5], surface roughness created by Ar ion bombardment [5], surface alloy formation [7] and molecular adsorption [11]. There are indications of a contribution to the RA response around 1.8 eV from electronic transitions between surface states [3][4][5]8]. To date, there have been no ab initio calculations of the RA response of Au(110)-(1 × 2).…”

Section: Introductionmentioning

confidence: 99%

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Contributions from surface-modified bulk electronic bands to the reflection anisotropy of Au(110)-(1 × 2)

Martin

Cole

Blanchard

et al. 2004

J. Phys.: Condens. Matter

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We investigate the temperature dependence of the optical reflectance anisotropy (RA) of the Au( 110)-(1 × 2) surface and find that transitions involving surfacemodified bulk bands contribute to the RA spectrum. The RA peaks observed at room temperature at photon energies of 3.52 and 4.50 eV are assigned to the transitions E F → L u 1 and L 2 → L u 1 , respectively. The assignments are based upon a comparison between temperature-induced shifts in the energy of these RAS peaks and thermovariation optical spectroscopy results of the temperature dependence of transition energies between bands at the L symmetry point. The application of RAS to Au(110) can be seen as a model system for exploring surfaces in a range of environments including ultra-high vacuum,high pressures and at the solid/liquid interface. The results reported here further the understanding of the RA spectrum of the clean Au(110) surface.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Contributions from surface-modified bulk electronic bands to the reflection anisotropy of Au(110)-(1 × 2)

Martin

Cole

Blanchard

et al. 2004

J. Phys.: Condens. Matter

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“…The spectrum is in good agreement with previously measured spectra from this stepped surface. 14,18,[28][29][30][31] The shoulder profile centered at 2.2 eV has been well simulated 18,23 by the surface local-field model 32 that is based upon the polarization of atomic dipoles at the ͑110͒ surface. The RA spectrum of the stepped surface is different from that obtained from Cu͑110͒ surfaces prepared via conventional ion bombardment-annealing cleaning cycles, where an intense RAS peak is observed at ϳ2.1 eV, 8,18,23 shown by the solid line in Fig.…”

Section: B Ras In the Region 15-30 Evmentioning

confidence: 99%

Effects of ion bombardment on the optical and electronic properties of Cu(110)

2005

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We investigate changes in the optical and electronic properties of Cu͑110͒ upon Ar ion bombardment at room temperature using reflectance anisotropy spectroscopy ͑RAS͒. Using a stepped Cu͑110͒ surface of narrow terraces where transitions between surface states near E F at the Ȳ point do not occur, we observe the return of these transitions upon ion bombardment through the emergence of a RAS peak at 2.08 eV. We relate the return of this RAS peak to a repopulation of the lower-lying surface state on the larger terraces produced by ion bombardment and room-temperature annealing. Further bombardment increases the density of surface vacancies and results in the disruption of the upper surface state leading to a reduction in intensity of the 2.08 eV RAS peak. Changes upon bombardment in the RA response around 4 eV-a region dominated by transitions near the L point in bulk Cu-are simulated in terms of a three-phase model of vacuum, surface, and bulk where the dielectric anisotropy of the surface layer is modeled using the energy derivative of the bulk dielectric function. We conclude that the RA response of Cu͑110͒ is highly sensitive to the occupancy of surface states and the presence of vacancies.

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“…The RAS technique has been used to study metal surfaces [11][12][13][14], the orientation of molecules at metal/vacuum interfaces [15,16], the orientation of biological molecules at metal/liquid interfaces [17][18][19] and polymer materials [20,21]. In the work presented here RAS was used to probe the influence of oriented nanofibres on glass substrates on the anisotropy and alignment of collagen produced by fibroblast cells in comparison to the anisotropy and alignment intrinsically present in collagen from solution and collagen which has been prepared using dialysis to form fibrils referred to herein as 'nanofibrillar' collagen.…”

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confidence: 99%

The use of reflection anisotropy spectroscopy to assess the alignment of collagen

Schofield

Kearns

et al. 2011

J. Phys. D: Appl. Phys.

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The alignment of collagen fibres in tissue has a major influence on their mechanical properties. This study investigated the ability of Reflection Anisotropy Spectroscopy (RAS) to determine the degree of alignment of collagen fibres deposited onto surfaces and secreted by mouse fibroblast cells in vitro. Aligned nanofibres of polytetrafluoroethylene (PTFE) were deposited on glass coverslips using a simple friction transfer method.These linear parallel nanofibres were used as topographical cues to orientate and align L929 fibroblasts and their deposited collagen. The strength of the RAS signal was demonstrated to correlate with the degree of collagen alignment. Immunochemical staining and atomic force microscopy were used to visualise the topography of the fibres and confirm that the RAS signal was as a result of collagen fibres. Collagen deposited onto glass coverslips from a solution that had been subjected to dialysis that caused 'nanofibrillar' collagen to form also resulted in a strong RAS signal whereas collagen absorbed from a simple solution of collagen in which collagen fibres are not formed resulted in no RAS signal. It was concluded that the RAS signal could be used to determine the degree of alignment of collagen and that this could have a potential application in the assessment of collagen orientation in tissue repair.

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The preparation of smooth Au(110) and Cu(110) surfaces for biomolecular adsorption

Cited by 7 publications

References 15 publications

Contributions from surface-modified bulk electronic bands to the reflection anisotropy of Au(110)-(1 × 2)

Contributions from surface-modified bulk electronic bands to the reflection anisotropy of Au(110)-(1 × 2)

Effects of ion bombardment on the optical and electronic properties of Cu(110)

The use of reflection anisotropy spectroscopy to assess the alignment of collagen

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