The adsorption of bipyridine molecules on Au(110) as measured by reflection anisotropy spectroscopy

Cm, Smith; Dolan, G. J.; Farrell, T.; Maunder, A; Fernig, David G.; Edwards, C.; Weightman, P.

doi:10.1088/0953-8984/16/39/013

Cited by 16 publications

(11 citation statements)

References 61 publications

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“…5,6 In this work we present the results of studies of adenine adsorbed at Au͑110͒/electrolyte interfaces using reflection anisotropy spectroscopy ͑RAS͒, which is a surface sensitive optical technique that can provide information on the orientation of molecules adsorbed at interfaces. [7][8][9][10][11][12][13][14][15][16][17][18][19] Initial studies of adenine adsorbing onto mercury electrodes showed that the adenine molecule undergoes a phase transition from planar to vertical as the potential is changed. 20,21 There have been a number of electrochemical studies of the adsorption of adenine on the Au͑111͒ and Au͑100͒ surfaces.…”

Section: Introductionmentioning

confidence: 99%

Determination of the structure of adenine monolayers adsorbed at Au(110)/electrolyte interfaces using reflection anisotropy spectroscopy

Bowfield

Dolan

et al. 2009

The Journal of Chemical Physics

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Reflection anisotropy spectroscopy (RAS) has been used to show that at saturation coverage adenine adsorbs on the Au(110)/electrolyte interface in a base-stacking configuration with the plane of the bases orientated vertically on the surface and with the long axis of the molecules parallel to the [110] direction. Changes in the RAS observed from adsorbed adenine as a result of changes in the potential applied to the Au(110) electrode could arise from slight changes in the orientation of the molecules in the vertical plane.

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Section: Introductionmentioning

confidence: 99%

Determination of the structure of adenine monolayers adsorbed at Au(110)/electrolyte interfaces using reflection anisotropy spectroscopy

Bowfield

Dolan

et al. 2009

The Journal of Chemical Physics

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“…The optical technique of RAS has considerable potential for the study of interactions between important biological molecules and surfaces . It is one of the few surface science techniques able to bridge the gap between the UHV and ambient environments, and the technique has been shown to provide information on the orientation of adsorbed molecules. − Recent studies have shown that RAS can yield insight into the metal/liquid interface − and to the interactions between molecules in solution and metal surfaces. , …”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7] Recent studies have shown that RAS can yield insight into the metal/liquid interface [8][9][10][11] and to the interactions between molecules in solution and metal surfaces. 12,13 The strategy is to determine the differences between the RAS of the adsorbed molecules and the clean Au(110) surface as a function of the applied voltage and to compare these differences for the three amino acids, cysteine, cystine, and methionine, in order to gain insight into their binding modes by exploiting the different coordination of the S groups in the three molecules.…”

Section: Introductionmentioning

confidence: 99%

Reflection Anisotropy Spectroscopy Study of the Adsorption of Sulfur-Containing Amino Acids at the Au(110)/Electrolyte Interface

Leparc

Cuquerella

et al. 2006

Langmuir

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Protein interactions with surfaces are key to understanding the behavior of implantable medical devices. The optical technique of reflection anisotropy spectroscopy (RAS) has considerable potential for the study of interactions between important biological molecules and surfaces. This study used RAS to investigate the adsorption of S amino acids onto Au(110) in a liquid environment under different conditions of potential and pH. Certain spectral features can be associated with the Au(110), as reported previously, while other features are assigned to bonds between the amino acids and the Au surface. The RA spectra are shown to be influenced by the structure of the amino acid, the solution pH, and the applied electrode potential. This work has assigned the negative feature at 2.5 eV to the Au-thiolate, bond while the positive feature at 2.5 eV is assigned to the disulfide bond. The broad spectral feature at 3.5 eV is attributed to the Au-amino interaction, while the sharper feature at slightly higher energy is associated with the Au-carboxylate interaction. Sulfur-containing amino acids are frequently found on the outside of protein molecules and could be used to anchor the protein to the surface.

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“…The magnitude of ∆n = (n 1 -n 2 ) can be estimated from the stress birefringence coefficient. Assuming n 1 is the refractive index of PDMS at 635 nm [26] and a birefringence coefficient of 13.5 x 10 -5 (MPa -1 ) then using equation (15) ∆R/R is in the range 0 -5 x 10 -3 for the range of extensions in figure 3. In this estimation any dispersion in n 1 has been ignored;…”

Section: Discussionmentioning

confidence: 99%

Reflection anisotropy spectra of polydimethylsiloxane under a range of mechanically applied stress

Farrell¹,

Cm²,

Schofield³

et al. 2010

J. Phys. D: Appl. Phys.

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Reflection anisotropy spectra (RAS) of transparent elastomeric polydimethylsiloxane (PDMS) have been determined over the spectral range 1.5 eV to 5.0 eV for a range of tensile loads. Using a slight wedge shaped sample the spectra from the incident air/PDMS surface are shown to be weak and largely featureless at all loads. By contrast the spectra from the light transmitted through the sample and reflected at the other interface are large in magnitude and exhibit features which arise from the small stress birefringence of PDMS. The birefringent dominated spectra can readily be simulated using expressions derived from a Stokes-Mueller treatment of the optical system and this enabled the stress-optical coefficient to be determined at any energy within the spectral range covered. It is shown that there is a small angle between the optical axes and the mechanical axes in the sample and that this is consistent with the model of an elastomer which comprises a network of soft linear chains cross linked with stiff bridges.

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The adsorption of bipyridine molecules on Au(110) as measured by reflection anisotropy spectroscopy

Cited by 16 publications

References 61 publications

Determination of the structure of adenine monolayers adsorbed at Au(110)/electrolyte interfaces using reflection anisotropy spectroscopy

Determination of the structure of adenine monolayers adsorbed at Au(110)/electrolyte interfaces using reflection anisotropy spectroscopy

Reflection Anisotropy Spectroscopy Study of the Adsorption of Sulfur-Containing Amino Acids at the Au(110)/Electrolyte Interface

Reflection anisotropy spectra of polydimethylsiloxane under a range of mechanically applied stress

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