Adsorption of (S)-glutamic acid induces segregation of Ni at bimetallic Au/Ni surfaces

Trant, Aoife G.; Jones, T.E.; Noakes, T.C.Q.; Bailey, Paul; Baddeley, Christopher J.

doi:10.1016/j.susc.2009.11.021

Cited by 14 publications

(23 citation statements)

References 27 publications

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“…The latter, aligned with the <112> direction, is more likely stabilized by ionic interactions between Ni 2+ and the carboxylate functionalities of pyroglutamate. The strong affinity between glutamic acid and nickel is demonstrated in the case of Glu adsorption at Ni films on Au(111) [171]. Since Au diffuses easily through Ni, for a 8 ML Ni film it was possible to move gradually from a Ni-rich to an Au-rich surface by thermal treatment.…”

Section: Ni/au Systemsmentioning

confidence: 99%

“…The formation of the 1-D ordered structure observed in STM images is probably driven by Hbonding interactions between neighbouring molecules. [279] (column c), [171] (columnd), [280] (column e), [250] (column f) and [251] (column g).…”

Section: Adsorption At Pt(111) and Pd(111)mentioning

confidence: 99%

“…The case of Glu adsorption at Ni clusters [279] and thin films [171] deposited on Au(111) is another interesting case, although characterised by a completely different chemistry. Upon Ni deposition on Au(111) at 300 K, 2-D islands nucleate at the elbows of the herringbone reconstruction [281] (Figure 70a) and extend then to larger patches of the surface (Figure 70c).…”

Section: Ni/au Systemsmentioning

confidence: 99%

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Adsorption and self-assembly of bio-organic molecules at model surfaces: A route towards increased complexity

Costa

Pradier

Tielens

et al. 2015

Surface Science Reports

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Understanding the bio-physical-chemical interactions at nanostructured biointerfaces and the assembling mechanisms of so-called hybrid nano-composites is nowadays a keyissue for nanoscience in view of the many possible applications foreseen. The contribution of surface science in this field is noteworthy since, using a bottom-up approach, it allows the investigation of the fundamental processes at the basis of complex interfacial phenomena and thus it helps to unravelthe elementary mechanisms governing them. Nowadays it is well demonstrated that a wide variety of different molecular assemblies can form upon adsorption of small biomolecules at surfaces. The geometry of such self-organized structures can often be tuned by a careful control of the experimental conditions during the deposition process. Indeed an impressive number of studies exist (both experimental and -to a lesser extendtheoretical), which demonstrate the ability of molecular self-assembly to create different structural motifs in a more or less predictable manner, by tuning the molecular building blocks as well as the metallic substrate. In this frame, amino acidsand small peptides at surfaces are key, basic, systems to be studied. The amino acidsstructure is simple enough to serve as a model for the chemisorption of biofunctional molecules, but their adsorption at surfaces has applications in surface functionalization, in enantiospecific catalysis, biosensing, nanoparticles shape control or in emerging fields such as "green" corrosion inhibition. In this paper we review the most recent advancements in this field. We will start from amino acids adsorption at metal surfaces and we will evolve then in the direction of more complex systems, in thelight of the latest improvements of surface science techniques and of computational methods. On one side, we will focus on amino acids adsorption at oxide surfaces, on the other on peptide adsorption both at metal and oxide substrates. Particular attention will be drawn to the added value provided by the combination of several experimental surface science techniques and to the precious contribution of advanced complementary computational methods to resolve the details of systems of increased complexity. Finally, some hints into experiments performed in the presence of water and then characterized in UHV and in the related theoretical work will be presented. This is a further step towards abetter approximation of real biological systems. However, since the methods employed are often not typical of surface science, this topic is not developed in details.2

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Section: Ni/au Systemsmentioning

confidence: 99%

Section: Adsorption At Pt(111) and Pd(111)mentioning

confidence: 99%

Section: Ni/au Systemsmentioning

confidence: 99%

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Adsorption and self-assembly of bio-organic molecules at model surfaces: A route towards increased complexity

Costa

Pradier

Tielens

et al. 2015

Surface Science Reports

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“…The authors investigated the stability of CuPt near surface alloy (NSA) upon exposure to CO and O 2 environments. The CuPt NSA was prepared by physical vapour deposition of one atomic layer of Cu on Pt (111) and annealing in UHV at 800 K. Combining PES, low energy electron diffraction (LEED) and ion scattering spectroscopy (ISS) techniques the authors showed that in vacuum Cu was preferentially located to the second layer leaving a monoatomic Pt 'skin' at the outermost surface (NSA). Upon Langmuir CO exposures at low temperatures the NSA alloy remained practically intact.…”

Section: Single Feed Experimentsmentioning

confidence: 99%

Alloys in catalysis: phase separation and surface segregation phenomena in response to the reactive environment

Zafeiratos

Piccinin

Teschner

2012

Catal. Sci. Technol.

213

182

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Alloys play a crucial role in several heterogeneous catalytic processes, and their applications are expected to rise rapidly. This is essentially related to the vast number of configurations and type of surface sites that multi-component materials can afford. It is well established that the chemical composition at the surface of an alloy usually differs from that in the bulk. This phenomenon, referred to as surface segregation, is largely controlled by the surface free energy. However, surface energy alone cannot safely predict the active surface state of a solid catalyst, since the contribution of other parameters such as size and support effects, as well as influence of the adsorbates, play a major role. This can lead to numerous surface configurations as for example over the length of a catalytic reactor, as the chemical potential of the gas phase changes continuously over the catalyst bed and hence different reactions may prevail at different catalyst bed segments. Thanks to the rapid improvement of the analytical surface science characterization techniques and theoretical methodologies, the potential effects induced by alloyed catalysts are better understood. For catalysis, the relevance of measurements performed on well-defined surfaces under idealized ultrahigh vacuum conditions has been questioned and studies in environments that closely resemble conditions of working alloy catalysts are needed. In this review we focus on experimental and theoretical studies related to in situ (operando) observations of surface segregation and phase separation phenomena taking place on the outermost surface layers of alloy catalysts. The combination of first principles theoretical treatment and in situ observation opens up new perspectives of designing alloy catalysts with tailored properties

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“…They stated that CO would induce the diffusion of Ni atoms to the surface of Au-Ni clusters even at room temperature and under low pressure environments (b1 L, 1 L = 1.33 × 10 − 6 mbar·s). Baddeley and coworkers [33] investigated the adsorption of the (S)-glutamic acid on bimetallic Ni/Au surfaces created by annealing thin Ni films on Au(111) and observed the outward segregation of Ni on Au-rich bimetallic surfaces by medium energy ion scattering (MEIS) even at 25°C. Gas-induced restructuring of bimetallic surfaces has been extensively reported, but such dynamic structure change is usually observed at elevated temperature up to several hundred degrees celsius or/and under high pressure in the mbar range [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Growth and characterization of Au, Ni and Au–Ni nanoclusters on 6H-SiC(0001) carbon nanomesh

Wang

et al. 2012

Surface Science

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Adsorption of (S)-glutamic acid induces segregation of Ni at bimetallic Au/Ni surfaces

Cited by 14 publications

References 27 publications

Adsorption and self-assembly of bio-organic molecules at model surfaces: A route towards increased complexity

Adsorption and self-assembly of bio-organic molecules at model surfaces: A route towards increased complexity

Alloys in catalysis: phase separation and surface segregation phenomena in response to the reactive environment

Growth and characterization of Au, Ni and Au–Ni nanoclusters on 6H-SiC(0001) carbon nanomesh

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